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Mgtr. Amador Soto Gallufe Consultor Intercade

AREA 05-PROCESS LINE A

f) Shut- Down: The motor may be shut-down normallyoperating either the Local or Remote stop switches

(PB1-05-0203-2 or PB2-05-0203-2). In addition, the motorwill shut down automatically under either of the following

conditions:

1. If oil level in main reservoir drops below a pre-determined level.

2. If oil level in either of the bearing inlet reservoirs drops

below a pre-determined level.

3. If oil level in both bearing inlet reservoirs does not

reach a pre-determined level within 10 seconds afterinitial start up.

g) Instrumentation:


AREA: 05-CONCENTRATOREQUIPMENT N AND TITLE:05-0205D-SV REGRIND BALL MILL

# 1 PNEUMATIC CLUTCH

EQUIPMENT LOCATION DRAWING N: 05-30-027ELEMENTARY AND INTERCONNECTIONDRAWING N: 05-0205DP&D DRAWING N: 00-50-012

a) Power Source: 460V Ball Mills A MCC-P5C (05-8903).

b) Controls: The clutch operating solenoid valve (05-0205D-SV) isprovided with a Local Disengage switch (PB1-05-0205D) and aRemote control switch is installed in control panel CC-5M which islocated in the control room of the Concentrator Building. The Localcontrol switch is located in Vendor furnished control panel (LC-RA-2).

c) Status Indication: Status indication is provided bye means of a Redengage light and a Green disengage light, both of which are integralto the Remote control switch (PB2-05-0205D).

d) Interlocks: The clutch operating solenoid control circuit is interlockedwith the Regrind Ball Mill motor (05-0205-M) and the Regrind BallMill compressed air system.

e) Start-Up (Engage): Energizing of the clutch operating solenoid maybe initiated by operating the Remote engage switch (PB2-05-0205D). The clutch will engage provided the following conditions aremet:

1. Regrind Ball Mill #1 motor (05-0205-M) is running.

2. Regrind Ball Mill # 1 compressed air is up to operating pressure.

3. All components are functioning normally.

f) Shut-down (Disengage): The clutch may be disengaged normally byoperating either the Local or Remote disengage switches (PB1-05-0205D). In addition, the clutch will disengage automatically under

either of the following conditions:

1. If the Regrind Ball Mil #1 : motor is stopped.2. If the Regrind Ball Mill #1 compressed air drops below operating

pressure.

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AREA: 05-CONCENTRATOR

EQUIPMENT N AND TITLE:05-0205D-H1 REGRIND BALL MILL# 1 LUBE OIL HEATER

EQUIPMENT LOCATION DRAWING N: 05-30-027ELEMENTARY AND INTERCONNECTIONDRAWING N: 05-0201CP&D DRAWING N: 00-50-012

a) PowerSource: 460V Ball Mills A MCC-P5C (05-8903).

b) Controls: The controls for the lube oil heater consists of a low-level lubeoil contact (CR3-05-0205-2), an oil over-temperature switch (TS1-05-0205-H), all connected in series with the heater contactor coil (42-05-0205-H)

c) Status Indication: Status indication is provided bye means of a Redoperating light at the local control panel LC-RA (light is out when heaterisoff).

d) Interlocks: The heater control circuit is interlocked with the Lube Oilsystem through the low-level switch (LLS-3-05-0205-2) energizing TS1-05-0205-Hand the heater over-temperatureswitch TS2-05-0205-H.

e) Start-Up: Since the only controls on this heater are the lube oil andheater temperature switches and the oil level relay (CR3-05-0205-2), theheaterwill operate automaticallythe following conditionsare met:

1. Main breaker power is on

2. Oil level in reservoir is above operating level (CR3-05-0205-2energized).

3. Lube oil temperatureis below operating temperature.

4. Heater temperature is below operating temperature.

5. All componentsare functioningnormally

f) Shut-down : The heater may be shut off manually bye means of themain power circuit breaker only (at the MCC). The heater will shut offautomaticallyunder either of the following conditions:

1. Oil in reservoir drops below operating level (CR3-05-0205-2) deenergized.

2. Oil temperature exceeds operating temperature.

3. Heater temperature exceeds operating temperature.



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12.0 GRINDING AND FLOTATION

12.5.1 PRIMARY GRINDINGCIRCUITS A&B (contd)

CONSOLE CC-5M/UA 5000MFeeder 1A Malf.(motor)alarm 04-0701-MFeeder 2A Malf.(motor)alarm 04-0702-MFeeder 3A Malf.(motor)alarm 04-0703-MFeeder 1B Malf.(motor)alarm 04-0704-M

Feeder 2A Malf.(motor)alarm 04-0705-MFeeder 3A Malf.(motor)alarm 04-0706-MFeeder 1A Hydr. Malf.alarm 04-0701-MFeeder 2A Hydr. Malf.alarm 04-0702-MFeeder 3A Hydr. Malf.alarm 04-0703-MFeeder 1B Hydr. Malf.alarm 04-0704-MFeeder 2A Hydr. Malf.alarm 04-0705-MFeeder 3A Hydr. Malf.alarm 04-0706-M

B. BALL MILL FEED BELL CONVEYORS (04-0602&04-0603)

1) BELT STOPPED ALARMIf the belt conveyor stops for any reason, including normal

shutdown, the BELT STOPPED ALARM in annunciator UA-5000M will activate.

2) EMERGENCY STOP ALARMThe belt conveyor is equipped with an emergency stop pullcordlocated along the path of the belt. The EMERGENCY STOPALARM in annunciator UA-5000M will activate if the conveyorhas been stopped by someone pulling the pulicord switches.

3) ANNUNCIATOR ALARM NUMBERS

CONSOLECC-5M/UA-5000M A CKT BCKT

CONVEYOR CONVEYORBel t S topped A la rm 04-0602M 04-0603MEmergencyStop Alarm 04-0602M 04-0603M

C. BELT SCALES (04-4501 & 04-4502)1) DESCRIPTION OF OPERATION



The belt scale system control the feed rate to ball mill feed beltconveryors. Both belt scale systems are identical, the first belt scalesystems are identical, the first belt scale system serves ball mill feedbelt conveyor 04-0602 for grinding circuit A, the other serves ballmill feed belt conveyor 04-0603 for grinding circuit B. The following

operationdescription applies to both feed rate control systems:

The ore on the ball mill feed conveyor is weighed by an electronicbelt scale. The load-cell-type belt scale is equipped with local feedrate indicator, tonnage totalizer and transmission circuits for remoteinstrumentation.

The belt scale will furnish rwo types of output signals to the grindingcontrol panel, CP-5M/5F; one is an analog signal for remoterecording and control, and one is a digital (pulse) signal for remotetotalization.

Fine ore feed rate is controlled by the feed rate indicating controllerwhich provides a signal to the variable speed drives fo the fine orefeedersthrough bias stations for each feeder unit.

The signal is also transmitted to a ratio controller. The feed ratesignal multiplied by the set ratio (solids to liquid) will provide thecorrect water/ore ratio signal which will control the water flow(Gallons per minute).

2. OPERATING CONTROLS (FOR LOCAL CONTROL BOX)

Power On-Off switch. Warning: switch to Power Off will erase allbelt scale readings.

Run, span, zero selector switch

Start test (momentary) pushbutton used to clear the calibrationcounter and to set the test duration counter to zero when runningzero and span calibration test.

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Test duration and calibration counter .

Auto zero momentary pushbutton, only to be used as per v endorsinstructionfor belt scale calibration.

INSTRUMENT & CONTROL NUMBERSA CKT A CKT

CONVEYOR CONVEYORFIELD ELEMENTS 04-0602 04-0603Weight Element WE-5001 WE-5101Sp eed Sensor W E/ST-5001 W E/ST-5101

LOCAL CONTROL BOXFeed Rate indicator W I-5001 W I- 5101Tonnage to tal ize r WQI -5001B WQI-5101BFeed rate signal W T-5001 W T-5101Integrator (A/D) W QY-5001 W QY-5101

GRINDINGCONTROL PANEL CP-5M/5FTonagge total izer WQI-5001A WQI-5101AFeed rate recorder WR-5001 WR-5101Feed rate control ler WIC-5001 WIC-5101Ratio station WFI-5001 WFI-5101Bias station SY-5001 ABC SY-5101 ABC

ORE/WATERRATIO CONTROL SYSTEM (FIC-5002& FIC-5102)

DESCRIPTION OF OPERATION:

Ore on the ball mill feed conveyor is weighed, speed compensatedand feed rate and tonnage is displayed locally and on control panelCP-5M/5F.

The 4-20mA rate signal from the scale is also routed to a ratiocontroller on CP-5M/5F. The rate signal multiplied by fixed ratio(solids to liquid) is used to provide the correct water/ore ratio. Thisratio signal is supplied to the water flow controller which regulateswater addition to the ball mill.



The water flow rate to the ball mill is also recorded at control panelCP-5M/5F.

INSTRUMENT & CONTROL NUMBERSACKT BCKT

BALL MILL BALL MILL05-0201 05-0202

FIELDFlow elemt FE-5002 FE-5102Flow transmiter FT-5002 FT-5102Control valve FV-5002 FV-5102

CONTROLPANEL CP-5M/5FRatio station WFI-5001 WFI-5101Flow controller water FIC- 5002 FIC- 5102Flow recorder water FR-5002 FR-5102Flow square r oot station FY- 5002 FY- 5102

1ST STAGE BALL MILLS (05-0201 & 05-0202)

The process control philosophy for both ball mills is identical. Theoperationdescription applies to both Ball Mill circuits.

BALL MILL DRIVE MOTOR POWER MONITORING

The ball mill power draw is measured and transmitted to theconcentrator controm room for recording and overload alarmannunciation on control console CC-5M.

ACKT B CKTBALL MILL BALL MILL

FIELD (MCC) 05-0201 05-0202

Powe primary element JE-5004 JE-5104Power trasmitter JT-5004 JE-5104


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A CKT A CKTCONVEYOR CONVEYOR

CONTROLPANEL CP-5M/5F 05-0201 02-0202Power recorder JR-5004 JR-5101Overloadsetpoint swi tch JSH 5004 05-0202M

2) BALL MILL BEARING TEMPERATURE MONITORING

The temperature monitoring and alarm system for each ball millcontinouosly measure and compare the alarm setpoints with actualbearing and motor temperatures. On deaviation from setpoint, themonitor will actuate the annunciator section of the monitor to alert theoperator.

The monitoring and alarm system is equipped with an integral alaracknowledge and test feature as well as an analog temperatureindicator, and individual selector switches to permit direct readings ofthe equipmenttemperatures and setpoints.

The first stage Ball Mill Temperature Monitors are located in controlpanel CP-5M/5F:

A CKT A CKTCONVEYOR CONVEYOR

CONTROLPANEL CP-5M/5F 05-0201 05-0202Temperaturemonitor TI/TAH-5008 TI/TAH-5108

3) BALL MILL LUBE SYSTEM



a. BALL MILL LUBE SYSTEM PACKAGEThe following alarm windows are activated from the vendor suppliedLube System Package. For vendor supplied Lube System Package,se Vendor (MINE& SMELTER CORP).Dwg.N. 108479.

C ONSOLEC C-5M/UA-5000M ACKT BCKT

Flow elemt 05-0201 05-0202Flow transmiter 05-0201 05-0202

b. COOLINGWATER FLOW SWITCHThe cooling water flow from each Lube System Package ismonitored, and low water flow will activate an alarm on console CC-5M.

FIELD A CKT B CKTCooling water f low swi tch FSL-5015 FSL-5115

CONSOLECC-5M/UA-5000MLow Cooling water flow alarm FAL-5015 FAL-5115

c. GEAR SPRAY LUBE SYSTEMFor information on the automatic gear spray system see Vendor(LINCOLN)drawings:

MSI N. 204125 & 204126MSI N. 105609 & 105610

4. BALL MILL AIR CLUTCH SYSTEMFor local instrumentsseee Vendor (BARBER GREENE CO.)Dgw. N CP-3090

F. 1ST STAGE CYCLONE FEED SUMPS (03-2701 & 03-2702)

1) LEVEL CONTROLMake water is added to the cyclone feed sumps in order to

maintain the desired feed-pulp density. The controlling parameterfor makeup water addition is sumplevel.

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The sump levels and measured with ultrasonic level detectors andare controlled by indicating controllers which regulate the processwater control valves.

FIELD ELEMENTS A CKT B CKTLevel sensor/transmiter LE/LT-5006 LE/LT-5106Level indicator/t ransmiter LIX-5006 LIX-5106Level control valve LV-5006 LV-5106

CONTROLPANEL CP-5M/5FSum p level controller LIC- 5006 LIC-5106

2) WATERFLOW RECORDERSThe makeup water flow required to maintain sump level, is measuredand recorded at the concentrator control room.

FIELD A CKT B CKTFlow Element FE-5005 FE-5105Flow transmiter FT-5005 FT-5105

CONTROLPANEL CP-5M/5FSquare r oot extr actor FY- 5005 FY- 5105W ater flow recorder FR-5005 FR-5105

G. 1ST STAGE CYCLONE FEED PUMPS (05-1501 & 05-1561)(05-1502 & 05 - 1562)

The following instrumentation is used to measure and displaycyclone feed pump motor current and pump status.

LOCAL (MCC) A CKT B CKTPumpN 1 primaryelement IE 5007 IE 5107Pum p N 1 tr ansm itter IT 5007 IT 5107



LOCAL (MCC) A CKT B CKTPumpN 2 primaryelement LE/LT-5006 IE-5111Pump N 2 transmitter IT-5011 IT-5111

CONTROLPANEL CP-5M/5FPumpN. 1 current indicator I I 5007 I I 5107Pum p N. 2 transm itter II 5011 II - 5111

CONTROLCONSOLE CC-5M/UA-5000MN 1 Feed PumpMal f.Alarm 05-1501M 05-1502MN 2 Feed PumpMal f.Alarm 05-1561M 05-1562M

H. 1ST STAGE CYCLONE CLUSTER (05-0501 & 05-0502)

The 1st stage cyclone clusters are equipped with the followingpressureg auges:

FIELD A CKT B CKTInput p ressure g aug e PI- 5009A PI-5109AInput p ressure g aug e PI- 5009B PI-5109BInputpressuregauge (cluster) PI-5009 PI-5109Input p ressure g aug e PI- 5009C PI-5109CInput p ressure g aug e PI- 5009D PI-5109D

I. 2ND STAGE BALL MILL WATER CONTROL SYSTEMS (FIC-5027& FIC-5127)

1. DESCRIPTION OF OPERATION:

The second stage ball mill requires dilution water to adjustpulp density prior to grinding. The water to adjust pulp densityprior to grinding. The water flow rate is measured andrecorded,and the controller maintains a manually set flow rate.


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12.5.1 PRIMARY GRINDING CIRCUITS A&B (contd)

2) INSTRUMENTS & CONTROL NUMBERS

FIELD A CKT B CKTFlow element FE-5027 FE-5127

Flow transmiter FT-5027 FT-5127Control Valve FV-5027 FV-5127

CONTROLPANEL CP-5M/5FFlow controller FIC 5027 FIC-5127Flow recorder FR 5027 FR-5127F low square root s tat ion FY 5027 FY-5127

J. 2ND STAGE BALL MILLS (05-0203 & 05-0204)

Both second stage ball wills have indentical process controlphilosophy, and the same operation description applies to both ballmill circuits.

1) BALL MILL DRIVE MOTOR POWER MONITORING

The ball mill power is measured and converted to standard (4-20mA) signal for recording and overload alarm annunciation atconcentrator control room.

FIELD (MCC) A CKT B CKTPow er p rimarye lement JE-5025 JE-5125Flow transmiter JT-5025 JT-5125

CONTROLPANEL CP-5M/5F

Power recorder JR-5025 JR-5125Alarm setpoint swi tch JSH-5025 JSH-5125



A CKT B CKTCONSOLECC-5M/UA-5000M 05-0203 05-0204Overload alarm JAH-5025 JAH-5125Flow transmiter 05-0203M 05-0204M

2. BALL MILL TEMPERATURE MONITORINGThe temperature monitoring and alarm system for each ball mill willcontinuosly measure and compare the alarm set-ponts with actualbearing and motor temperatures. On deviation from setpoint, themonitor will actuate the annunciator section of the monitor to alertthe operator to the alarm source.

The temperature monitoring and alarm system is quipped with andintegral alarm acknowledge and test feature, as well as an analogtemperature indicator and individual selector switches to permitdirect readings of the equipmenttemperature.

The second stage Ball Mill temperature monitors are located incontrol panel CP-5M/5F:

CONTROLPANEL CP-5M/5F A CK B CKTTemperaturemonitor TI/TAH-5026 TI/TAH-5126

3. BALL MILL LUBE SYSTEM

a. BALL MILL LUBE SYSTEM PACKAGEThe following alarm windows are activated from Vendor suppliedLube System Package. For instrument inside the Lube systemPackage see Vendor (MINE & SMELTER CORP.) Dwg. N

108479.

CONSOLECC-5M/UA-5000M A CK B CKTLube sys. Filter Dirty-Alarm 05-0203 05-0204Lube Oil Malf . Alarm 05-0203 05-0204

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b. COOLINGWATER FLOW SWITCHThe cooling water flow from each Lube System Package ismonitored, and low water flow will activate an alarm on consoleCC-5M.

FIELD A CKT B CKTCooling water flow switch FLS-5040 FLS-5140

CONSOLE CC-5M/UA -5000MLow cooling water flow alarm FAL-5040 FAL-5140

c. GEAR SPRAY LUBE SYSTEMFor information on the automaticc gear spray system see Vendor(LINCOLN)drawings:

MSI N. 204125 & 204126MSI N 105609 & 105610

4. BALL MILL AIR CLUTCH SYSTEMFor local instruments see Vendor (BARBER GREENE CO.)Dwg. N CP3090.

K. 2ND STAGE CYCLONE FEED SUMPS (03-2705 & 03-2706)

1) LEVEL CONTROLMakeup water is added to the cyclone feed sumps in order tomaintain the desired feed-pulp density, The controlling parameterfor makeup water addition is sump level.

The sump levels are measured witch ultrasonic level detectorsand are controlled by indicating controllers which regulate theprocesswater control valves.



The sump levels and measured with ultrasonic level detectors andare controlled by indicating controllers which regulate the processwater control valves.

FIELD A CKT B CKTLevel sensor/transmiter LE/LT-5030 LE/LT-5130Level indicator/t ransmiter LIX-5030 LIX-5130Level control valve LV-5030 LV-5130

CONTROLPANEL CP-5M/5FSump l evel controller LIC-5030 LIC- 5130

2) WATER FLOW RECORDERSThe makeup water flow, used to maintain sump level, is continuoslymeasuredand is recorded at the control room.

FIELD A CKT B CKTFlow Element FE-5029 FE-5129Flow transmiter FT-5029 FT-5129

CONTROLPANEL CP-5M/5FSquare r oot extractor FY-5029 FY-5129W ater flow recorder FR-5029 FR-5129

L. 1ST STAGE CYCLONE FEED PUMPS (05-1503 & 05-1563)(05-1504 & 05 - 1564)

The following instrumentation is used to measure and displaycyclone feed pump motor current and pump status:

LOCAL (MCC) A CKT B CKTPumpN 1 primaryelement IE 5007 IE 5131PumpN 1 f ie ld t ransmitter IT 5031 IT 5133PumpN 2 f ie ld t ransmitter IE 5033 IT 5133PumpN 2 f ie ld t ransmitter IT 5033 IT 5133


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CONTROLPANEL CP-5M/5F A CKT B CKTPumpN 1 cur rent i ndi cator I I-5031 I I-5131

PumpN 2 current indicator I I-5033 I I-5133

CONTROL CONSOLE CC-5M/UA-5000MN 1 Feed Pumpmal f.Alarm 05-1503M 05-1504MN 2 Feed Pumpmal f.Alarm 05-1563M 05-1564M

M. 2ND STAGE CYCLONE CLUSTER (05-0503 & 05-0506)The second stage cyclone clusters are equipped with the followingpressure gauges:

FIELD A CKT B CKTInput P ressur e Gauge PI-5032A PI-5132AInput P ressur e Gauge PI-5032B PI-5132BInput P ressur e Gauge PI-5032C PI-5132CInput P ressur e Gauge PI-5032D PI-5132DInputPressure Gauge (cluster) PI-5032 PI-5132Input P ressur e Gauge PI-5032E PI-5132EInput P ressur e Gauge PI-5032F PI- 5132FInput P ressur e Gauge PI-5032G PI-5132G

N. CONDITIONERTANK (05-1201 & 05-1202)

1. pH CONTROL SYSTEM

The milk of lime addition to the conditioning tanks is based on phmeasurement in the overflow box of each tank. The pH-signal is sentto a controller and recorder in control panel CP-5M/5F. Thecontroller operates a solenoid valve, wich in turn actuates the milk oflime control valve.

12.0 GRINDING AND FL>OTATION


CONTROLPANEL CP-5M/5F A CKT B CKTpH probe AE-5035 AE-5135pH transmitter AT-5035 AT-5135

Solenoid valve AEV-5035 AEV-5035Control valve AV-5035 AV-5135

2. TANK AGITATOR ALARMS

CONSOLECC-5M/UA-5000MAgitator Malf . Alarm 05-2001M 05-2002M

O. ROUGHERFLOTATION FEED SUMP (05-2711 & 05-2712)Ph INSTRUMENTATION

The pH measurement signal for each feed sump is transmited to thecontrol panel where it is alarmed (high & low pH) and recorded.

FIELD A CKT B CKTpH probe AE-5401 AE-5421pH transmitter AT-5401 AT-5421

CONTROLPANEL CP-5M/5FpH recorder AR-5401 AR-5421high/low pH setpoint switch ASH/L5401 ASH/L-5421

CONSOLECC-5F/UA-5400FHigh/low pH alarm AAH/L-5401 AAH/L-5421

P. FINE ORE STORAGE DUST COLLECTOR (04-0801) (AREA 04)

The following instruments are part of the dust collection controlsystem:

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FIELDSlurry tank level sensor FE-5127Low water flow switch FT-5127

CONSOLECC-5M/UA-5000M

Low water flow alarm FAL-4013

Q. ANNUNCIATOR/ALARMSYSTEMS

The alarms for primary grinding circuits are annunciated on UA-5000M.See drawing N 05-40-014.


12.5.2 ROUGHER/SCAVENGER FLOTATION

A. ROUGUERI FLOTATION CELLSRougher I consists of two (2) banks of flotation cells for each circuit.The level of each bank is measured by a static pressure type levelprobe. Two dart valves, for level adjustment, are controlledautomatically by the level control signal. The system also has amanual control option.

The level controller for each bank is mounted close to the dartvalves. All dart valves will fail open upon instrument air failure. SeeVendor (WEMCO)drawing N 8041680-14 for moreinformation.

F IELD A CKT NUMBER N UMBERlevel cont rol ler 05-2601 L IC -5403

(BAN K 1) l evel con trol val ve thru LV-5403Alevel control valve 05-2603 LIC-5403B

level cont rol ler 05-2604 L IC -5404(BAN K 2) l evel con trol val ve thru LV-5403A

level control valve 05-2606 LIC-5404B

FIELD B CKTlevel cont rol ler 05-2607 L IC -5423

(BAN K 1) l evel con trol val ve thru LV-5453Alevel control valve 05-2609 LIC-5423B


level control valve 05-2612 LIC-5424B

B. ROUGHER II FLOTATION CELLS

1) LEVEL CONTROLRougher II consists of two banks of flotation celis for each circuit.The level of each bank is measured by a static pressure type levelprobe. Two dart valves (for level adjustment) are controlledautomatically by the level control signal. The system also has amanual control option.


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12.5.2 ROUGHER/SCAVENGER FLOTATION cont`d

A. ROUGUERI FLOTATION CELLSThe level controller for each bank is mounted locally close to the dartvalves. All dart valves will fail open upon instrument air failure. SeeVendor (WEMCO)drawing N 8041680-14.

CELL INSTRUMENTFIELD A C KT NUMBER NUMBERlevel cont rol ler 05 -2615 LIC -5405

(BAN K 1) l evel control val ve thru LV-5405Alevel control valve 05-2618 LV-5405B

level control ler 05-2619 LIC-5406(BAN K 2) l evel control val ve thru LV-5406A

level control valve 05-2622 LV-5406B

FIELD B CKTlevel cont rol ler 05 -2623 LIC -5425

(BAN K 1) l evel control val ve thru LV-5425Alevel control valve 05-2609 LV-5423B

level cont rol ler 05 -2610 LIC -5426(BAN K 2) l evel control val ve thru LV-5426A


2) pH INSTRUMENTATION

The pH measurement signal for flotation cells is transmitted to thecontrol panel where it is alarmed (high/low)and r ecorded.

CELL INSTRUMENTFIELD A CKT NUMBER NUMBERACKT pH probe 05-2615 thru 2618 AE-5407ACKT pH transmitter 05-2615 thru 2618 AE-5407BCKT pH probe 05-2623 thru 2626 AE-5427BCKT pH transmitter 05-2623 thru 2626 AE-5427



A. ROUGUERI FLOTATION CELLS

CONTROL PANEL CP-5M/5FA CKT pH recorder AR-5407ACLT pH high/low pH setpoint switch ASH/L-5407

B CKT pH recorder AR-5427BCKT pH high/low pH setpoint switch ASH/L5427

CONTROLCC-5F/UA-5400FA C KT high/low pH alarm AAH/L- 5407B C KT high/low pH alarm AAH/L- 5427

C. SCAVENGER I FLOTATION CELLS1)LEVEL CONTROL

Scavenger I consist of two (2) banks of flotation cells for eachcircuit The level of each bank is measured by a static pressuretype level probe. Dart valves (for level adjustment) are controlledautomatically by the level control signal. The system also has amanual control option.

The level controller for each bank is mounted locally close to thedart valves. All dart valves will fail open upon instrument airfailure. See Vendor (WEMCO) drawing N. 8041680-14.

CELL INSTRUMENTFIELD A CKT NUMBER NUMBERLevel controller 05-2633 LIC-5408Level control valve thru LV-5408ALev el control valv e 05-2636 LV- 5408B

Level controller 05-2637 LIC-5409Level control valve thru LV-5409ALev el control valv e 05-2640 LV- 5409B

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CELL INSTRUMENTFIELD B CKT NUMBER NUMBERLevel Controller 05-2641 LIC-5428Level Control valve thru LV-5428ALevel Contr ol v alve 05-2641 LV-5428B

Level Controller 05-2645 LIC-5429Level Control valve thru LV-5429ALevel Control valve 05-2648 LV-5429B


The pH measurement signal for flotation cells is transmitted to thecontrol panel where it is alarmed (high/low)and recorded.

CELL INSTRUMENTFIELD NUMBER NUMBERACKT pH probe 05-2637 thru 2640 AE-5413ACKT pH transmitter 05-2637 thru 2640 AE-5413BCKT pH probe 05-2645 thru 2648 AE-5433BCKT pH transmitter 05-2645 thru 2648 AE-5433

CONTROL PANEL CP-5M/5FA CKT pH recorder AE-5413ACKT high/low ph setpoint switch ASH/L-5413

BCKT high/low ph setpoint switch ASH/L-5433B CKT pH recorder AR-5433

CONSOLECC-5F/UA-5400F

A CKT high/low pH alarm AAH/L-5413B CKT high/low pH aarm AAH/L-5433


12.5.2 ROUGHER/SCAVENGER FLOTATION (contd)

D. SCAVENGER II FLOTATIONScavenger II consist of three (3) banks of flotation cells for eachcircuit. The level of each bank is measured by a static pressure typelevel probe. Dart valves (for level adjustment) are controlledautomatically by the level control signal. The system also has amanual control option.

The level controller for each bank is mounted locally close to thedart valves. All dart valves will fail open upon instrument air failure.See Vendor (WEMCO)drawing N. 8041680 14.

CELL INSTRUMENTFIELD A CKT NUMBER N UMBERlevel cont rol ler 05-2649 L IC -5410

(BAN K 1) l evel con trol val ve thru LV-5410Alevel control valve 05-2651 LV-5410B



level control ler 05-2655 LIC-5412(BAN K 3) l evel con trol val ve thru LV-5412A


FIELD B CKTlevel control ler 05-2659 LIC-5430

(BAN K 1) l evel con trol val ve thru LV-5430Alevel control valve 05-2661 LIV-5430B

level control ler 05-2665 LIV-5432(BAN K 2) l evel con trol val ve thru LV-5432A


E. ENNUNCIATOR/ALARMSYSTEMS

The alarms for rougher/scavenger flotation are annunciated onUA-5400F. See drawing N. 05-40-015


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12.5.3 CLEANER FLOTATION & REGRIND

A. REGRINDCOLLECTION SUMP (05-2722)Makeup water is added to the collection sump to maintain thedesired feed-pulp density. The selected flow rate is set from manualcontroller located on control panel CP-5M/5F.

The sump level is measured by an ultrasonic level detector; high andlow level alarms are displayed on the control console inconcentrator control room.

The status of the three regrind transfer pumps is monitored, andalarm will be annunciated if any one of the three pumps malfunction.One pumpis stand-by.

FIELD INSTRUMENTSSon ic l evel sensor/t ransmitter LE/LT-5205Sumplevel indicator & t ransmitter LIX-5205High setpoint switch LSH-5205Low setpoint switch LSL-5205Water control valve HV-5200

CONSTROLPANEL CP-5M/5F

Process water controller HIC-5200

CONSOLECC-5M/UA-5000MSump level high alarm LAH-5205Sump level low alarm LAL-5205Transfer p ump #1 malf. alarm 05-145OMTransfer p ump #2 malf. Alarm 05-1541M

Transfer p ump #3 malf. Alarm 05-1570M

B. REGRINDCYCLONE FEED SUMPS (05-2713 & 2714)

The two feed sump level control systems are identical and thisoperationdescription applies to both sumps.


12.5.3 CLEANER FLOTATION & REGRIND (contd)

The feed sump level is maintained by adding fresh water to thesump. The ultrasonic level sensor measures the sump level andsupplies level signal to the level controller. The flow of the freshwater is also measured and the flow r ate is displayed on the control

oanel.

SUMP SUMPFIELD INSTRUMENTS 05-2713 05-2714Level sensor/transmitter LE/LT-5212 LE/LT-5222Level indicator/t ransmitter LIX-5212 LIX-5222Water control valve LV-5212 LV-522Water flow sensor FE-5213 FE-5223W ater f low transmitter FT-5213 FT-5223

B. REGRINDCYCLONE FEED PUMPS (05-1505 & 05-1565)(05-1506 & 05-1566)

The following instrumentation is used to measure and displaycyclone feed pump motor current and pump status:

SUMP SUMPFIELD (MCC) 05-2713 05-2714Pump N . 1 prim . elem ent IE-5218 IE-5228Pump N. 1 transmitter IE-5218 IE-5228Pum p N. 2 prim. elem ent IE- 5219 IE- 5229Pump N. 2 transmitter IT-5219 IT-5229

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SUMP SUMPCONTROLPANEL CP-5M/5F 05-2713 05-2714PumpN . 1 cu rren t indi cator I I - 5218 I I - 5228Level indicator/t ransmitter I I - 5219 I I - 5229

D. REGRINDCYCLONE CLUSTERS (05-0509 & 05-0510)

The regrind cyclone clusters are equipped with the followingpressure gauges:

BALL MILL I BALL MILL IICLUSTER CLUSTER

FIELD 05-0509 05-0510Input p ressure g auge PI-5214A PI-5224AInput p ressure g auge PI-5214B PI-5224BInput p ressure g auge PI-5214C PI-5224CInputpressuregauge (cluster) PI-5214 PI-5224Input p ressure g auge PI-5214D PI-5224D

D. REGRINDCYCLONE MILLS (05-0205 & 05-0206)

The process control philosophy for both ball mills is identical and

the same operation description applies to both Ball Mill controlsystems.



1) BALL MILL DRIVE MOTOR POWER MONITORINGThe ball mill power is measured and converted to standard (4-20 mA)signal for recording and overload alarm annunciation at control room.

BALL MILL I BALL MILL IIFIELD (MCC) 05-0205 05-0206Power prim ary elem ent JE-5210 JE-5220Power transmitter JT-5210 JT-5220

CONTROLPANEL CP-5M/5FPower recorder JR-5210 JR-5220Over loadsetpoint sw it ch JSH-5210 JSH -5220

CONSOLECC-5M/UA-5000MOverload alarm JAH-5210 JAH-5220Failur e (motor) alarm 05-0205M 05- 0206M

2) BALL MILL TEMPERATURE MONITORING

The temperature monitoring and alarm system for each mill willcontinuosly measure and compare the alarm setpoints with actualbearing and motor temperatures. On deviation drom setpoint the

monitor will actuate the annunciator section of the monitor to alert theoperatorto the alarm source.

The monitoring and alarm system us equipped with an integral alarmacknowledge and test feature, and an analog temperature indicatorand individual selector switches, to permit direct readings of theequipment temperatures.

The regrind Ball Mill Temperatures Monitors are located in controlpanel CP-5M/5F:


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BALL MILL I BALL MILL IIFIELD 05-0205 05-0202Temperaturemonitor TI/TAH-5211 TI /TAH-5221

3) BALL MILL LUBE SYSTEM

a. LUBE OIL SYSTEM PACKAGEThe following alarm windows are activated from Vendor suppliedLube System Package. For instruments inside the Lube SystemPackage see Vendor (MINE & SMELTER CORP) drawing N108479.

BALL MILL I BALL MILL IICONSOLECC-5M-UA-5000M 05-0205 05-0202Lube Sys. FilterDirty-alarm 05-0205 05-0206Lube Oil Malf. alarm 05-0205 05-0206

COOLINGWATER FLOW SWITCHThe cooling water flow from each Lube Oil System Package ismonitored by a flow switch. Low water flow will activate an alarm inthe control room.

BALL MILL I BALL MILL IIFIELD 05-0205 05-0202Cooling water f low swi tch FSL-5216 05-5226

CONSOLECC-5M/UA-5000MLow water f low alarm FAL-5216 FAL- 5226

C. GEAR SPRAY LUBE SYSTEM

For information on the automotive gear spray system, see Vendor(LINCOLN)drawing:

MSI N. 204125 & 204126MSI N. 105609 & 105610


12.5.3 CLEANER FLOTATION & REGRIND contd

4) BALL MILL AIR CLUTCH SYSTEMFor local instruments see Vendor (BARBER GREENE CO.)drawing N CP-3090.

F. CONCENTRATE SCAVENGER I SUMP (05-2727) LEVELCONTROL

The sump level is measured by ultrasonic level detector. This levelsignal is used to Start/Stop vertical sump pumps as well as togeneratehigh level alarm at the control room. One pump is stand-by.

FIELDSonic l evel sensor /t ransmi tte r LE/LT-5488Sumplevel indicator & t ransmitter LIX-5488High/low setpoint switch LSH-L-5488High setpoint switch LSH-5488Pump selector switch HS-5488

CONSOLECC-5F/UA-5400FSump level high alarm LAH-5488

G. 1ST CLEANER FEED SUMP (05-2717)

1) LEVEL CONTROLThe sump level is measured by ultrasonic level detector. This levelsignal is used to Start/Stop vertical sump pumps as well as togenerate high level alarm at the control room. One pump is stand-by.

FIELDSonic l evel sensor /t ransmi tte r LE/LT-5485

Sumplevel indicator & t ransmitter LIX-5485High/low setpoint switch LSH-L-5485High setpoint switch LSH-5485Pump selector switch HS-5485

CONSOLECC-5F/UA-5400FSump level high alarm LAH-5485

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The pH measurement signal from the sump is transmitted to thecontrol room whereit is alarmed (high/low) and recorded.

FIELDpH probe AE-5436pH transmiter AT-5436

CONTROLPANEL CP-5M/5FpH recorder AR-5436h igh/l ow pH setpoint sw it ch ASH/L-5436

H. 2ND AND 3RD CLEANER FEED SUMP (05-2718 & 05-2719)LEVEL CONTROLThe sump level is measured by ultrasonic level detector. This levelsignal is used to start/stop vertical sump pumps as well as togenerate high level alarm at the contro room. One pump is stand-by.

2ND CLEANER 3RD CLEANER(05-2718) (05-2719)

FIELD SUMP SUMP

Sonic level sensor/trans LE/LT-5486 LE-LT-5487Sumplevel indicator & trans LIX 5486 LIX-5487High/low setpoint switch LSH/L-5486 LSH/L-5487Pump s elector switch HS-5486 HS-5487

CONSOLECC-4F/UA 5400F

Sumplevel h igh alarm LAH-5486 LAH-5487



I. 1ST AND 2ND CLEANER FLOTATION CELLSThe 1st and 2nd cleaner consist of two (2) banks is measured byan static pressure type level probe. Dart valves (for leveladjustment) are controlled automatically by the level controlsignal. The system has a manual control option.

The level controller for each bank is mounted locally close to thedart valves. All dart valves will fail upon instrument air failure.

CELL INSTRUMENTFIELD (1ST CLN) NUMBER NUMBERlevel cont rol ler 05-2672 L IC -5438

(BAN K 1) l evel con trol val ve thru LV-5438Alevel control valve 05-2675 LV-5438B



FIELD (2ND CLEANER)level control ler 05-2682 LIC-5441

(BAN K 1) l evel con trol val ve thru LV-5441Alevel control valve 05-2685 LIV-5441B

level control ler 05-2686 LIV-5442(BAN K 2) l evel con trol val ve thru LV-5442A


J. 3RD CLEANER FLOTATION CELLS (05-2692 through 05-2695)

1) LEVEL CONTROL

The 3rd cleaner consist of one (1) bank of flotation cells. Thelevel of the bank is measured by an static pressure type levelprobe. Dart valves (for level adjustment) are controlledautomatically by the level control signal. The system has amanual control option.


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12.5.3 CLEANER FLOTATION & REGRIND cont`dThe level controller for the bank is mounted locally close to the dartvalves.All dart valves will fail open upon instrument air failure.

INSTRUMENTFIELD B CKT NUMBERLevel Controller LIC-5447Level Control valve LV-5447A

Level Control valve LV-5447B


The pH measurement signal from the flotation cells is transmitted tothe control panel where it is alarmed (high/low pH) and recorded.

FIELDpH probe AE-5445pH transmitter AT-5445

PANEL CP-5M/5FpH recorder AR-5445high/low ph setpoint switch ASH/L-5445

CONSOLECC-5F/UA-5400FHigh/low pH alarm AH/L-5445

K. ANNUNCIATOR/ALARMSYSTEMS

The alarms for Regrind area are annunciated on UA-5000M. Seedrawing N 05-40-014.

Alarms for Cleaner Flotation area are displayed on UA-5400F. Seedrawing N 05-40-015


12.5.4 THICKENING AND FILTERING

A. CONCENTRATE THICKENER (05-1203)Thickener instrumentation includes overtorque alarms, safetyshutdown switches, and a torque recorder.

The concentrate a thickener discharge rate is controlled manually bythe setting of the underflow discharge valve. Thickener dirve motor

and the two underflow pumps are alarmed for motor malfunction-

F. CONCENTRATE SCAVENGER I SUMP (05-2727) LEVEL CONTROLThe sump level is measured by ultrasonic level detector. This level signalis used to Start/Stop vertical sump pumps as well as to generate highlevel alarm at the control room. One pump is stand-by.

FIELD INSTRUMENTSRake torque sensor OE-5450Rake torque indicator and transmitter OIT-5450

High-High torque switch OSHH-5451High torque switch OSH-5453Motor torque indicator OI-5452

CONTROL PANEL CP-5M/5F

Rake torque recorder OR-5450High torque a setpoint switch OSH-5450

CONSOLE CC-5F/UA 5400FHigh torque alarm OAH-5450

Drive motor malf. Alarm 05-2101MUflow pump #1 malf. alarm 05-1521MUflow pump #2 malf. Alarm 05-1522M

FIELDCapacitance level probe LE/5456High/ow setpoint switch LSH/L-5456

CONTROL CONSOLE CC-5F/UA-5400FLow level alarm LAL-5456High level alarm LAH-5456

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12.5.4 THICKENING AND FILTERING (contd)

C. CONCENTRATE FILTERS (05-2301 & 05-2302)The filter feed Distributor gravity feeds the two concentrate drumfilters, the feed rate to each drum filters is manually adjusted. Ifone of the filters is shutdown, an air actuated shut-off valve willclose off the corresponding drum filter feed line.

The liquid level of each filter is measured by a capacitance typelevel switch wich will transmit high and low level alarms toconsole CC-5F.

A high filter cake storage level will be detected by a tilt switch,wich will then activate corresponding alarm on console CC-5F.Filter failure alarms are also displayed on the annunciator.

FILTER #1 FILTER #2FIELD INSTRUMENT 05-2301 05-2302Shut-off valve HV-5457 HV-5459Shut-down h and switch HS-5457 HS-5459C apac itance level p robe LE-5458 LE-5460High/low setpoint switch LSH/L-5458 LSH/L-5460Tilt switch LSH-5481 LSH-5482

CONTROLCONSOLE CC-5F/UA-5400FLow level alarm LAL-5458 LAL-5460

High level alarm LAH-5458 LAH-5460Highstorage level a larm LAH-5481 LAH-5482Filter failure a larm 05- 2301M 05- 2302M

D. VACUUM PUMPS (05-1536 & 05-1537)The filtration vacuum pumps, together with the drum filter blowerand air compressors,are located in the compressorroom.

The vacuum pumps are equipped with local protectiveinstrumentation and safety shutdown interlocks. The seal watersupply is equipped with low pressure alarm safety shutdownswitches. Both vacuum pumps will activate alarms in controlconsole CC-5F on pump motor malfunction.


12.5.4 THICKENING AND FILTERING (contd)

PUMP #1 PU MP #2FIELD (COMPRESSORROOM) 05-1536 05-1537Seal water pres.switch(alarm) PSL-5464 PSL-5474Seal water pres.switch (shutdown) PSL-5465 PSL-5475Seal water solenoid valve EV-5470A EV-5480ASeal water solenoid valve EV-5470B EV-5480B

E. VACUUM RECEIVERS (05-1401 & 05-1402)Both vacum receivers are equipped with pressure gauges andpressure transmitters. The receiver v acuum is displayed on controlpanel CP-5M/5F.

RECEIVER RECEIVERFIELD (COMPRESSORROOM) PT-1401 PT-1408Pressure transmitter PT-5468 PT-5478

CONTROLPANEL CP-5M/5FVacuum receiverpres.indicator PI-5468 PI-5478

F. ANNUNCIATOR / ALARM SYSTEMS

The alarms for Thickening and Filtering are annunciated on UA-5400F. See drawing N- 05-40-015


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12.5.5 TAILINGS AND WATER TANKSA. TAILINGS THICKENER (06-1201)

Tailings thickener instrumentation includes overtorque alarms, safetyshutdownswitches, and torque recorder.

The tailings thickener discharge rate is controlled by manual settingof the Uflow discharge valve.

Remote recording and control instrumentation for the tailingsthickener are located in the concentrator control room. An alarmcondition will be signaled on control console CC-5F if the thickenerdrive motor malfunctions.

FIELD INSTRUMENTSRake torque sensor OE-6001Rake torque transmiter OY-6001Hightorque swi tch(normalover load) OSH-6002High-hightorque switch(motorshutdown) OSHH-6003Horn silence pushbotton HS-6004Stalled overload indicating ligth and hornnormal overload indicating lightHightorque switch(overloadshutdown) OSH-6001A

CONTROLPANEL CP-5M/5FThickener torque recorder OR-6001High torque setpoint switch OSH-6001

CONTROLCONSOLE CC-5F/UA-5400FHigh torque alarm OAH-6001Drive motor malf. Alarm 06-2101M

B. RECLAIM WATER SETTLING POND (00-2101)Makeup water is added to settling pond in order to replenish water lost toprocess. The makeup water flow is controlled by a local level controlleractuating the electrically operated makeup water control valve.

FIELD INSTRUMENTSLevel sensor element LE-6010Level transmitter LT-6010Level controller LC-6010Level control valve LV-6010


12.5.5 TAILINGS AND WATER TANKS contd

C.RECLAIM WATER PUMPS (06-1501, 1502, 1503 & 1504)The four reclain water pumps, which deliver water to theProcess W ater Tank (00-1202), are controlled by levelsignals from the process water tank. A sequential controller,located in MCC Room #6, controls the start/stop sequence ofeach pump. All pumps will shutdown on low level in settling

pond or no high-high level in Process Water Tank (00-1202).

FIELD INSTRUMENTS (AT SETTLING POND)

Level sensor element LE-6016

Low level switch LSL-6016

LOCAL INSTRUMENTS (MCC ROOM #6)Sequential controller for pumps(06-1501,02, 03 & 04)

Control Philosophy:Low level: start one pumpHigh level: stop one pumpHigh high level: stop all pumps

D. PROCESS WATER TANK (00-1202)

The process water tank is equipped with a level gauge boardand a differential pressure-type level transmitter. The 4-20mAtank level signal is transmitted to concentrator control roomwhere it is recorded and annunciated for high and low alarmconditions.

In addition, the level signal is routed from the concentratorcontrol room to MCC Room #6 (reclain water settling pond),where it is displayed and used to generate the sognal for thereclaim water pumpsequential control.

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FIELD INSTRUMENTS (AT TANK)Level gauge board LI-0003Tank l evel in id icator & t ransmitter LIT-0004

LOCAL INSTRUMENTS (AT MCC #6)Tank level indicator LI-0004Low level sw it ch (sta rt s one pump) LSL-0004High level swi tch (s tops one pump) LSH -0004High-highlevel switch(stops all pumps) LSHH-0004

CONTROLPANEL CP-5M/5FTank level recorder LR-0004High/low lev el setpoint switch LSH/L-0004Tank at low level ligth; semi-graphicTank at high level ligth; semi-graphic

CONTROL CONSOLE CC-5M/UA-5000MHigh level alarm LAH-0004Low level alarm LAL-0004

E. FIRE PROTECTION (AND FRESH WATER) TANK (00-1201)The fire and fresh water tank is equipped with a level gauge board and adifferential pressure type level transmitter. The tank level signal is

transmitted to concentrator control room where the tank level is recordedand annunciated for high and low level alarm conditions.

In addition, a conductivity type level switch is used to sense the tanklevel to control (open/ close) motorized valve for adding river water. Anelectrically controlled valve is provided on the supply line to the fireprotectiontank as no instrumentair is available.

The eight inch diameter fire protection water linea leaving the tank isequipped with a flow switch. On high water flow rate, this switch willannunciate any usage of emergency water and will also serve as a firealarm.



FIELD INSTRUMENTS (AT TANK)Level gauge board LI-0001Tank l evel i ni di ca tor & transmit ter LIT-0002High/low level switch LSH-L0005Level control valve LV-0005Flow switch FSH-0006

CONTROLPANEL CP-5M/5FTank level recorder LAH-0002Tank at low level light; semi-graphicTank at high level ligth; semi -graphicHigh/low level setpoint switch LSHH-0002

CONTROLE CONSOLE CC-5M/UA-5000MHigh level alarm LAH-0002Low level alarm LAL-0002High water flow alarm FAH-0006

F. POTABLE WATER TANK (00-1203 & 00-1204)Each Potable Water Tank is eqquiped with a level gauge board andan altitude type level control valve.

TANK TANK

FIELD 00-1203 00-1204Level gauge boad LI-0017 LI-0019Pilot valve LV-0016 LV-0018Level control valve LCV-0016 LCV-0018

G. ANNUNCIATOR/ALARM SYSTEMS

The alarms for Tailings Thickener area are annunciated on UA-5400F. See drawing N 05-40-015.

Alarms for Water Tanks are annunciated on UA-5000M. See drawingN 05-40-015.


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12.0 GRINDING, FLOTATION, THICKENING AND FILTERING

12.6 PROTECTIVE RELAYS

In general, electrical power equipment such as transformers,substations, switchgear and motor control centers are providedwith protective devices to ensure against damage to equipment

and materials in the event of electrical overload or faultconditions.

Motor control centers are provided with thermal overload relaysto protect their associated motors.

For description of transformers, substation, switchgear andmotor control centers, refer to Section 8.0, titled PlantElectrical Power System

12.0 GRINDING, FLOTATION, THICKENING AND FILTERING

12.7 ELECTRICAL INTERLOCKS

Electrical interlocks for each item of equipment are described inSection 12.5, ELECTRICAL CONTROLS.

Electrical interlocks are normally provided to prevent start-up orto cause shutdown of a p articular piece of equipment.

Start-up prevented due one more start-up conditions not beingsatisfied (permissivestart).

Shut-down is initiated by an interlock when the operatingstatus of that interlock has changed either by deliberate intentor by reason of mal-function in the system.

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12.0 GRINDING, FLOTATION, THICKENING ANDFILTERING

12.8 PRE-STARTUP EQUIPMENT AND SYSTEM CHECKS

On termination of erection and before starting up a machine, acareful check should be carried out to make sure the machine hasbeen properly installed, adjusted and serviced and that themachine and operating area are free of remnants of constructionmaterials.

A complete record should be made of this work. All deficiencesshould be recorded, including a full description of the problemand action required. Upon completation of the r emedial action, asecond check should be made to insure the deficiency has beencorrected and the machine or system is in satisfactory workingcondition.

Prior to starting any machine or system, the operator shouldbecome fully familiar with the manufacturers installation,servicingand operating instructions.


12.9 EQUIPMENT TRIAL RUNS (No Load)

On completion of all necesary checks, the Plant may be released sor

the trial runs. The idle run of the machines should be carried out in

accordance with (including period of time) manufacturers installation,servicing and aoperating instructions. The starting procedure is

supervised on the spot. In the event deficiences become evident during

the start-up procedure, teh respective machine is stopped at once and

the faults are corrected. Once the machine is started, make sure that all

bearings are adequately lubricated, taht all oil and grease pumps areproperly working and that the control devices, especially for oil, grease,

cooling water, etc, respond properly.

Checks during these trial runs that the electrical interlocking system has

been executed in accordance with the plans. Check in particular wheteror not the control devices are included in the interlocking system and all

equipment protection and personnel safety devices function properly.

During the idle tun period the equipment must be continuosly monitored,

and the individual machines cheked for quiet and noise-free operation.

In the case of jerky operation or loud unusual noise, the bearings and

lubricating devices on the respective machine must be checked over.

Check also the driving elements, such as V-belt drives, chain drives,

etc., to remedy the causes for the faulty behavior of the machine. If

necessary, take the respective unit immediately out of operation and

carry out a step-by-step check of the installation of the machine.

Periodically check foundations for movement and vibration and for

loosening of assembly and anchor bolts. Check that suitable clearance

is maintained between stationary and moving/rotating parts.

A complete record should be kept of this work. All entries should be

recorded in conjuction with time of run. Record should include a

complete description of all problems and action required. Satisfactory

completion of remedial action should be recorded.

As proviously stated under Section 12.8, the operator should, prior to

starting any machine or system, become fully familiar with the

manufacturers`installation, servicing and operating instructions.


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12.9 EQUIPMENT TRIAL RUNS (No Load) (contd)

The following are for specific reference:

A. Grinding Mills

Some local heat may occur on the grinding mill trunnion bearings

until they seat themselves. This heating will be observed to beconfined to narrow bands on the trunnion surfaces and maywander back and forth over the width of the trunnions. As thesurfaces seat, a uniform heat will develop over the trunnionsurfaces and then will gradually decrease.

Observe the contact pattern formed on the grease coated millgear and pinion. A uniform contact pattern should be developing.

If the temperature of the trunnion should exceed vendorsrecommended maximum stop the mill and allow it to cool beforerestarting.

The mill Power Recorder and Temperature Monitor should beclosely observed during the break-in period. It will be noted thateach rise in temperature of main bearings will be accompaniedby an increase in mill power. Complete break-in will be indicatedby a bottoming of power consumption.

The mill drive motor should undergo an initial trial run with theload uncoupled. The bearing temperature should be monitored,especially during the initial period of operation. In this period oftime, the rate of bearing temperature rise is more indicative oftrouble than the absolute bearing temperature. If the rate ofbearing temperature rise appears excessive, shut the motordown and inspect the bearings.

Records of the steady state uncoupled vibration and bearingtemperatures should be kept for comparison with coupled andloaded running conditions.

The trial run for the grinding ball mill is to be without grindingmedia (before grinding media is charged to the mill) to allowbearings and drive to work in under partial loading.


12.9 EQUIPMENT TRIAL RUNS (No Load) (contd)

After the break-in run is completed, fill the grinding mill with water and

check for and stop all leakage from liner bolts.

The mill should the be charged with grinding media, graded in size.

Initial charge should be approximately 65 percent of total charge. A

cushion charge of material should be placed in the liners beforecharging the grinding media.

Mills should not be operated without a continuous and uniform rate of

new feed.

B. Slurry Pumps

Do not attempt to start a pump until drive rotation has been verified.

Operation with seal water, either low in quantity or pressure can cause

serious damage. Seal water requirements, including quatinty and

pressure are defined in the manufacturers installation, operation and

maintenance data.

Do not operate pump if solids hace settled and pump cannot be turned

by hand, noe with restricted or plugged suction or discharge lines (or

conbination of both).

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12.10 PLANT START-UP, OPERATION AND SHUTDOWN

12.10.1 GENERAL

Upon satisfactory completion of the trial runs, commissioning of thisportion of the plan may commence.

The following start-up procedures assume that start-up occursimmediately or very shortly after completion of the test runs. If thisis not the case or if work has been performed on any of theequipment, checks defined under Section 12.8 should be made asrequired to insure the system or item of equipment is ready foroperation.

Normal start-up involves making the prerequisite field checks andthen starting the equipment according to a systematic procedure.The entire concentrator, first stage grinding through and includingconcentrate loadout and tails disposal, must be considered as anoperating unit for start-up. There us no appreciable storagethroughout. Therefore, before starting any specific section the nextsection or section must be prepared to receive the process flow.

Initial start-up procedures as defined are with the automaticsampling system not in operation. When the sampling system is tobe brought on line and the procedures for initial sampling shall beestablished by the Plant Superintendent, in conjuntion with the PlantMetallurgist.

12.10.2 FIRST AND SECOND STAGE GRINDING

A. GeneralStart-up, operation and shutdown procedures are for that portion ofthe plant extending from reclaiming of ore from Fine Ore Storage

04-6001 to and including the Conditioner Tanks 05-1201, 05-2001,05-1202 and 05-2002.

First and second stage grinding consists of two independent lines.To afford better control, specially for initial start-up, only one line

should be started at a time. As the operation of that line stabilized,the other line can then be started. The following procedures areapplicable for either circuit.


12.10 PLANT START-UP, OPERATION AND SHUTDOWN

12.10. PLANT START-UP, OPERATION AND SHUTDOWN (contd)

B. Control StationsThe control and monitoring of the operation of first and secondstage grinding, including the individual tems of equipment areperformed from control panel CP-5M/5F and Control Console CC-5M installed in the control room of the Concentrator.

In addition, local control panels are provided for each:

1. Mill bearing lubrication system2. Mill gear lubrication system3. Mill air clutch system

Each system is furnished as a package unit, complete with requiredcontrols and instrumentation.

C.Start-Up

1. Determine that the plant communication system is in satisfactoryworking condition, that each area of operation is properly staffedand prepared for start-up, equipment and system checks arecomplete and the system is ready f or operation.

2. Review the status of the Fine Ore Stockpile and Fine Crushing

and Screening System. Is there sufficient ore reserve in thestockpile and sufficient ore supply to complete the scheduledrun.

3. Review status of the flotation system. Is it prepared to receiveprocess flow.

4. Contact operating personnel at location to establish;

a) System properly staffed.b) Electrical power is available to all motor startes and

control panels and that other utilities; ie: water andcompressed air are available to equipment as required.


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c) Grinding mills are filled to overflow with water.

d) Automatic process samplers are off and the cutters are out of

the path of material flow.

e) Pump sumps have adequate head of water.

f) Mills are clear of personnel and obstructions.

g) Reagent are or will be available at the various points of useand controls are set for stablished flow rate.

5. Turn Remote-Local selector switches to Local for the Reclain BeltFeeders and Ball Mill Feed Conveyor. Advise local operator, underlocal control, to start the feeders and conveyor and load the millfeed system to approximately normal load, then stop the feedsystem.

6. Return Remote/Local selector switches for this mill feed systemto remote.

7. Contact the operator in the Fine Crushing and Screening ControlRoom and determine status of the Fine Ore Storage Dust,Collecting System. If not already in operation, advise the operatorat that location to start the dust collecting system.

8. Advise the local operator to activate the Belt Scales (04-4501 and04-4502).

9. Set the setpoints of all flow controllers and othe control devices tothe initial established values and start all process recorders.

10. Advise the grinding mill operator(s) to start the lubrication systemsfor the first and second stage grinding mills. It is preferable after aprolonged shut-down to start these systems locally and observethat the system are functioning properly. For short duration

shutdowns, the systems should be left running. The systems mayalso be started from central control console CC-5M.



14. Start the conditioner tank agitator. The tank should be filled withwater to a level above the impeller before starting the agitator.

15. Start the second stage ball mill motor. Observe mill powerrecorder and temperature monitor for abnormal readings.

16. Start the first stage bal mill motor. Observe mill power recorderand temperature monitor for abnormal readings.

17. Check all annunciators to ensure that all systems are clear toengage the mill clutches.

18. Set Feed Rate Controller (5001 or 50101) to approximately 60percent of circuit rated capacity.

19. Engage the first stage ball mill air clutch. Observemill powerrecorder and temperature monitor for abnormal readings.

20. Start the Ball Mil Feed Belt conveyor.

21. Start the appropiate number of reclain Belt Feeders. Use manualspeed control. Observe f eed rate recorder.

22. Monitor the First Stage Cyclone Feed Sump Level IndicatingController (LIC5006 or LIC5106). When the level starts to rise,indicating discharge of pulp from the mill, start the Cyclone Feed

Pump, and observe pump current.

23. Engage the second stage ball mill air clutch. Observe mill power

recorder and temperature monitor for abnormal readings.

24. Monitor the Second Stage Cyclone Feed Sump Level IndicatingController (LIC5030 or LIC5130). When the level starts to rise,indicating discharge of pulp from the mill, start the Second StageCyclone Feed Pump.

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12.10 PLANT START-UP, OPERATION AND SHUTDOWN (contd)

One of the first and second stage grinding circuits is now in operation.

The same producers should be f ollowed for the other circuit.

D. Operation

1. Switch belt feeders to Auto mode and after operations

have been stabilized, gradually increase the feed rate byaproxymately 15 percent increments at first and then less asthe rated capacity is approached.

As the rate is increased, monitor the power draw of motorsto see that none of them are operating under an overload.

2. Rates and equipment settings specified are optimim forstart-up. Conditions will change with ore charactetistics.Operatings rates and settings must be established throughexperience and testing.

3. If the load in the circuit (solids to classifier) is maintained ata fairly constant level an the mill power maintained at theproper level, the product rate and size will normally besatisfactory.

4. Conditions of the grinding mill are indicated by:

An Underloaded Mill

a. High level of noise resulting from the balls poundingthe lining.

b. An excessive amount of fines in the mill discharge.c. Very little oversize being returned from the classifier.

An Overloaded Mill

a. Mill discharging at a high rate and the dischargecontaining a high proportion of material of new feedsize.

b. An appreciable drop in power below that indicated fornormal operation or an underloaded mill.



c. A large return of oversize from the classifier,

accompanied by a reduction in rate of classifier product.

Good Operation

a. A continuous regular dull mill noise without anydistinguishing noise from balls hitting the shell-a rumble.

b. Uniformity of mill discharge as to consistency and sizing.c. Uniformity of classifier oversize returns.

4. For initial start-up, the mills should be operated for 48 hours withthe 65 percent of total grinding media charge to furter allowbearings and drive to work-in and during which time preliminaryadjustments can be made. The charge should then be graduallybrought up to the rated charge.

It is recommended that the first few weeks of operation be with upto approximately 80 percent of the total recommended charge.

The experience obtained from this might indicate a change in thetop size of media or in the make-up of the charge. The last 20percent of the charge can then be added to bring about thedesired changes. Another reason for recommending that the millinitially operate with about 80 percent charge is to watch the mill

horsepower and if the mill power indicates that teh desired powerwill be drawn with a slightly lees charge than originallyrecommended, this can be taken into account in the addition ofthe last 20 percent.

E. Shutdown

1. Normal or scheduled Shutdown

Normal or scheduled shutdown sequence is generally in thesame order as the startup sequence. The followingimportant points or exception must be considered.


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a. The cyclone feed sumps and pumps must be clear of all

solids before shutdown. This can be accomplished byflushing the system with clear water before systemshutdown or draining the sumps.

b. The conditioner tank agitator must remain in operation as

long as there is a slurry in the tank. For shurdown the tank(and system) must be flushed out with clear water or thetank drained.

c. Length of down-time will determine operation or non-operation of the grinding mill main trunnion bearing andpinion bearing lubrication systems should be keptoperating. If the shutdown time is to be of long duration,the lubrication unit may be shutdown if it is so desired.Regardless, allow the trunnion bearing lubrication systemto operate for several minutes after the m ill is shut down.

d. If the mill is to be down for anu appreciable time, turn onthe lubricating oil heaters. It is to be noted that prior tostarting a mill, the lubricating oil temperature for bothsystems should be at least 32 degrees C for satisfactoryoperation.

2. Un planned (Emergency) Shutdown

Abnormal situation such as: low speed stop, emergency stopswitch actuation, crusher lube system malfunction, plugged c huteetc, that will, if operation continues, cause immediate damage toequipment or affect the flow of material are interlocked with thespecific item of equipment or affect the flow of material areinterlocked with the specific item of equipment or affect the flowof material are interlocked with the specific item of equipment andall critical upstream equipment for inmediate shutdown. Afterhaving checked the cause of the shutdown and ascertained thatthe cause of the shutdown has been corrected, the stoppedequipment can be re-started, generally in the order of previouslydefined start-up procedures.



The following important point or exception must be considered.

a. Do not start a cyclone feed pump if solids have settled andthe pump cannot be turned by hand. It is then necessary todrain the sump and flush out the pump.

12.10.3 FLOTATION

A. General

Start-up, operation and shutdown procedures are for that portion

of the plant extending from the Rougher Feed Pump receivingslurry from the Conditioner Tanks to the Final Tailings Sump 05-2721 and Final Concentrate Sump 05-2726.

Rougher, Rougher I, Rougher II, Scavenger I and Scavenger II

flotation consist of two indeoendent circuits A and B . Each ofthese lines receive feed from the corresponding grinding circuit Aand B. The grinding circuit started will then dictate the flotationcircuit to be started. The following procedures are applicable toeither circuit.

B. Control stations

The control and monitorng of the operation of this section of theplant are performed from Control Panel CP-5MFand ControlConsole CC-5F, installed in the control room in the ConcentratorBuilding.

C. Start Up

1. For initial start-up, it is assumed that the regrind systemwill not be started and be by-passed until the flotation,

dewatering and siltration systems are started andoperation stabilized.

2. In defining start-up procedures, ir must be assumed thatthe flotation operator has been advised of planned start-upof first and second stage grinding with sufficient time forpreparation of his section to receive the slurry flow.

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This preparation shall include:

a. Ensure that the system is properly staffed for start-up.

b. Establish electrical power is available to all motor startersand control panels and that other utilities; ie : water andplant and instrument compressed air, are available toequipment as required.

c. Reagents are or will be available at the variuous points ofuse and controls are set f or stablished flow rate.

d. The dewatering, filtering and tailings disposal sections willbe prepared to receive the flotation concentrate and tails.

e. All automatic process samplers are off and the cutters are

out of the path of material flow.

f. Ensure all manually operated dart valves in flotationmachines are closed.

g. Ensure all Auto/Manual selector switches on automaticpulp level controllers are in the auto position and allpneumatically actuated dart valves are operable and inAuto position.

h. Establish that all flotation machines are filled with water tothe required operating depth. Mechanisms should not bestarted until the cell liquid level is above the top row ofholes in the disperser.

i. Ensure that froth sprays and launder sprays are operable.

j. Check and ensure all froth bars are set at normal levels.

k. Check and ensure flotation cell weirs are set to a levelbelow froth lip level.



l. Check and ensure that mechanism air intakes are at propersetting. Generally, these are 100 percent open for roughersand 30 to 40 percent open for cleaners.

m. Ensure correct dart valve positions in flotations feed.n. All pump sumps have adequate head of water.

3. Upon notification that the first and second stage grinding is to bestarted, at Control Panel CP-5M/5F:

a. Start all flotation machine motors in predeterminedsequence.

b. Set Local/Remote selector switch for the appropiaterougher flotation feed pump to Local.

c. Start flotation pH recorders. Adjust pH controller to desiredsetpoints and place controllers in Auto mode.

The remaining start-up operations are performed by thelocal operators.

4. Upon flow of pulp from the conditioner tank, start the rougherflotation feed pump.

5. When the pulp reaches a specific bank of cells, start required flow of

reagents, flow of froth and launder spray water.

6. As the tails and concentrate from a specific line of cells dischargesto a sump, start the transfer pump serving that sump.

7. When pump flow approaches normal rates, open all manuallyoperated dart valves in flotation machines and lock actuating leversin predetermined position.

8. Adjust reagents and air to provide the desired froth characteristicsand overflow rate,

9. Adjust level control sensors to provide the optium operating frothdepth.


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Should xtreme surging of flotation feed slurry be experienced during

start-up, it is recommended that weir bars in the connection anddischarge boxes be removed until the weir is level with the slurry levelin the cell which provides the desired froth depth. Large flow surgeswill then pass over the weir and will not cause flooding of the froth

launders. It is not recommended that the controller settings bechanged to provide fast surge relief. This will r esult in very poor controlfor nomal operation long after the feed surge problem is solved.

D. Operation

1. Metallurgical variations incurred in start-up are usually confinedto two items; variation in recovery or variation in grade ofconcentrate from that anticipated. Prior to start-up, the decisionshould be made on wheter grade of concentrate or recovery is ofprime importance. The operator may then concentrate more onone if necessary to get the plant in operation.

2. Under normal operations, actual values will change. Factors suchas characteristics or ore, degree of grinding and amount ofreagents used will alter results. A table convering variables offlotation is entered at the end of this section.

3. A target operation should be developed, then conditions adjustedthrough experience and metallurgical controls to attempt to meetthis target.

The operator has the responsability for setting control parameterswith automatic control of some primary variable after that.

4. After operation is stabilized, motor amp readings, pulp specific

gravity and approximate air intake setting should be recorded forbase line data.

E. Shutdown

1. Normal or Scheduled Shutdown



Normal or scheduled shutdown is generally in the same order as

for start-up. The following important points must be considered.

a. Allow time for all flotation cell activity to cease and for all

flotation cell activity to cease and for pulp in flotation

machinesto be reducedto the desired degree of dilution.

b. Pulps in sumps and pumps must be purged of solids todegree that they will not be sanded-up upon shutdown.Otherwise, sumps and pumps must be drained and

flushedput with water.

c. Thorouhly purge with water the final concentrate pumping

line.

2. Unplanned(EmergencyShutdown)

There are no shutdown interlocks between equippment in theflotation system. All transfer pumps are provided with spare.

Therefore, except for some sanding which may generally becleared without shutdown, no malfunction of any piece ofequipment would seriously impede the flow of pulp and thereby

require emergencyshutdown.

Should a spontaneous shutdown of the entire flotation system be

required, the system including cells, sumps and pumps shouldbe drained and flushed out with water prior to restart.

12.10.3 REGRIND

A. General

The regrind section consists of two independent circuits. Toafford better control, especially for initial start-up, only one circuit

should be started at a time. As the operation of that line isstabilized, the other line can then be started. The followingproceduresare applicableto either line.

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B. Control Stations

The control and monitoring of the regrind section, includingthe individual items of equipment, are performed fromControl Panel CP-5M/5F and Control Consoles CC-5M & 5F,installed in the Control room in the Concentrator Building.

In addition, local control panels are providedfor each:

1. Mill bearing lubrication system.2. Mill gear lubricationsystem.3. Mill air clutch system

Each system is furnished as package unit, complete withrequired controls and instrumentation.

C. Start - Up

1. Determine that the plant communication system is insatisfactory working condition, that each area ofoperation is properly staffed and prepared for start-up,equipment and system checks are complete and thesystem is ready for operation.

2. Contact operating personnel at location to establish:

a. System properly staffed.b. Electrical power is avalaible to all motor startes

and control panels and that other utilities; ie: waterand compressed air are available to equipment asrequired.

c. All grinding mills are filled to overflow with water.d. All automatic process samplers are off and the

cuttersare out of the path of material flow.e. All pump sumohave adequate head of water.f. All mills are clear of personnel and obstructions.



3. Set the setpoints of all flow controllers and other controldevices to the initial established values and start all processrecorders.

4. Set the Remote/Local selector switches to Local for themill lubrication system pumps (low and high pressure).

5. Advise the grinding mill operator to start the bearing andgear lubrication system for the regrind mill. It is preferableafter a prolonged shutdown to start these systems locallyand observe that the system are functioning properly. Forshort duration shutdowns, the systems should be leftrunning. The bearing lube system may also be started atcentral control console CC-5F.

The lubrication systems should be started from the localcontrol panels in the following order.

a. If not already on, turn on the main bering and pinionbering lubrication system oil heater. (Oil heater wouldnormally br turned on a day in advance of start-up,

depending on the ambient temperature).The heater is primarily provided to maintain an oiltemperature of 32 degress C when the mill isshutdown. After the mill is started, except forexceptionally cold climates, the heater should be

turned off.b) Depress the Start lube pump push-button starting

the low pressure trunnion bearing lube oil systempump.

c) Depress the Start lube jacking pumo push-button,starting the main bearing high pressure jackingpump. The jacking pump is interlocked with the lowpressure trunnion bearing lube system to insure thatsystem is in operation before starting the highpressure system.

d) Start the gear spray lubrication system.


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6. Turn the Remote/Local selector switch for theappropriate Regrind Transfer Pump to Local Verify thatan operator is positioned at this sumo and pump.

7. Advise the local operators that the system is to be started.

Sound the Start warning alarm.

8. Start the regrind ball mill motor. Check that the graphicdisplay running ligth is on and check all annunciators toensure that all systems are clear to engage the mill clutch.Observe mill power recorder.

9. Advise the flotation operator to divert feed to the regrindsection.

10. Local operator is to start the regrind transfer pump as pulpbegins to discharge to the regrind collection sump.

11. When the regrind transfer pump graphic display runninglight comes on, engage the regrind ball mill air clutch.Observe mill power recorder and temperature monitor forabnormal readings-

12. Monitor the regrind cyclone feed sump level indicator (LIC5212 or LIC 5222). When the level starts to rise, indicatingdischarge of pulp from the mill, start the regrind cyclone

feed pump. Observe feed pump motor corrent.

The regrind section is now in operation-

The same procedures should be followed for Circuit N2.

D. Operation

Basic operating parameters are as specified for First and SecondStage Grinding.

E. Shut Down1. Normal or Scheduled Shutdown



Normal or scheduled shutdown sequence is generally the reverse

of the start-up sequence. The following important points irexceptions must be considered.

a. Sumps and pumps handling pulp must be clear of all solids

before shutdown. This can be accomplished by flushing thesystem with clear water before system shutdown or drainingthe sumps.

b. Length of down-time will determine operation or non-operationof the grinding mill main trunnion bearing lubrication systemsafter shutdown. If the shutdown time is to be of short duration,the lubrication systems should be kept operating. If theshutdown time is to be of long duration, the lubricantion systemto operate for several minutes after the mill is shutdown.

c. If the mill is to be down for any appreciable time, turn on thelubrication oil heaters. Its is to be noted that prior to starting themill, the lubricating oil temperature for both systems should beat least 32 degrees C for satisfactory operation.

2. Unplaned (Emergency) Shut-Down

Abnormal situations such as: low speed stop, emergency stopswitch actuation, crusher lube system malfunction, pluggedchute, etc. That will. If operation continues, cause inmediatedamage to equipment or affect the flow of material, areinterlocked with the specific item of equipment or affect the flowof material, are interlocked with the specific item of equipmentand all critical upstream equipment for inmediate shutdown. Afterhaving checked the cause of the shutdown and ascertained that

the cause of the shutdown has been corrected, the stoppedequipment can be restarted, generally in the order of previouslydefined start-up procedures.

The following important point or exception must be considered.

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a. Do not start a pump handling pulp if solids have settled

and the pump cannot be turned by hand. It is thenecessary to drain the sump and flush out the pump.

12.10.4 CONCENTRATE THICKENING AND FILTERING

A. GeneralStart-up, operation and shutdown procedures are for that portion ofthe plant extending from the Final Concentrate Sump 05-2726 toand including Final Concentrate Storage.

B. Control StationsThe control and monitoring of the operation of this section of theplant is performed from Control Panel CP-5M/5Fand ControlConsole CC-5F, installed in the control room of the ConcentratorBuilding.In addition, local control panels are provided for the ConcentrateThickener and the Concentrate Filtering Systems.

C.Start-Up

1. In defining start-up procedures, it must be assumed that thethickening-filtering operator(s) has been advised of theplanned startup of the grinding and flotation sections, with

sufficient lead time for preparation of this section to receivethe feed.

This preparation shall include:

a. Determine that the plant communication system is insatisfactory working condition, that each area of operation is

properly staffed and prepared for start-up, equipment andsystem checks are complete and the system is ready foroperation.

b. Check with the appropriate foreman to determine that

electrical power is available to all motor starters and controlpanels and that other utilities; ie: water and compressed air,are available to equipment as required.



c. Establish that flocculant is or will be available at the Final

Concentrate Sump 05-2726 and filter aid available at theFilter Feed Distributor 05-1601.

d. Advise the thickener operator to check that:

1. The thickener is clear of any objects that wouldbind the rakes.

2. The rake drive has been operated for a shorttime. That the rakes are not bound and there wasno high torque condition.

3. There is some clear water in the bottom of thetank, preferably enough to fill the cone bottom.

e. Check with filtering system operator that all equipment isprepared for operation.

f. Determine that seal water is available at all pumps,including the vacuum pump.

g. Determine that fresh water supply is available at correctpressure.

h. Advise the filter operator to set dart valves in the StaticDistributor 05-1601 so that the outlets to the filters are

closed and the overflow return line to the Final ConcentrateSump is open.

The following start-up procedures are for temporally recycling thethickener underflow back to the thickener feed. Otherwise, it willbe necessary to dispose of the underflow until it is of suitabledensity for f iltering.

i. Set the setpoints of all flow controllers and other controldevices to initial estimated valves Start thickener torquerecording.

j. Establish that reclain water system is prepared t o r eceivethe thickener overflow,


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k. Turn the Remote/Local selector switch for the FinalConcentrate Pump 05-1519 to Local. This pump is to b

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