geophysical survey report - ontario

Geophysical Survey Report

covering

Surface Pulse EM Surveys over the

Semple-Hulbert Property for

MacDonald Mines Exploration Ltd. during

June - July 2011

by

CRONE GEOPHYSICS & EXPLORATION LTD.

Survey Area: Semple-Hulbert Property north-west of Webequie, Ontario

Survey Type: Surface Pulse EM Surveys

Survey Operator: Serge Timoshenko, Evan Barley

Surface Surveys: Loop A, Line 0E, 100E, 200E, 300E, 400E, 500E, 600E, 700E, 800E, 900E, 1000E, 1100E, 1200E, 1300E, 1400E

Survey Period: June – July 2011

Report By: A.M.Khan Report Date: November 2011

Crone Geophysics & Exploration Ltd.


TABLE OF CONTENTS

PULSE ELECTROMAGNETIC SURVEY

1.0 INTRODUCTION

2.0 PROPERTY LOCATION 3.0 PERSONNEL 4.0 SURVEY METHODS

5.0 SURVEY PARAMETERS 6.0 PRODUCTION SUMMARY

APPENDICES

APPENDIX I: PROFILE PLAN MAPS

APPENDIX II: LINEAR (5-AXIS) PULSE EM DATA PROFILES

APPENDIX III: PULSE EM DATA PROFILES (LIN-LOG SCALE)

APPENDIX IV: CRONE INSTRUMENT SPECIFICATIONS



LIST OF FIGURES FIGURE 1: SEMPLE-HULBERT PROJECT GENERAL LOCATION GOOGLE MAP

FIGURE 2: PROPERTY CLAIM MAP FIGURE 3: SEMPLE-HULBERT PROPERTY LEASE MAP

FIGURE 4: CRONE DHEM LOOP A, LOOP B, LOOP C PLAN MAP FIGURE 5: TX LOOP A, MAP SHOWING DETAILS OF TDEM LINE COVERAGE

LIST OF TABLES TABLE I: TRANSMITTER LOOP COVERAGE

TABLE II: SURFACE SURVEY COVERAGE

TABLE III: CHANNEL CONFIGURATION TABLE IV: PRODUCTION SUMMARY



1.0 INTRODUCTION Crone Geophysics & Exploration Limited was contracted by MacDonald Mines Exploration Ltd. to conduct Surface Pulse Electromagnetic Surveys on its Semple-Hulbert Property located north-west of Webequie, Ontario. This report summarizes the geophysical work carried out in June - July, 2011.

Fifteen (15) surface lines covering about 15.70 km of TDEM data was acquired utilizing one (1) surface loop during the survey period June, 01st – July 06th 2011. The appendices to this report contain page size profile maps, PEM profiles (linear 5-axis and logarithmic scale), and Crone Instrument Specifications.

2.0 PROPERTY LOCATION

The Semple-Hulbert Project is located 68 kilometers north-west of Webequie, Ontario. Topographically, this survey area also exhibits a shallow relief, with an elevation ranging from 146 to 198 meters above sea level. This survey area is a very remote location, with many lakes and wetlands also covering the survey block. There are two large lakes running north-south through the western portion of the block. The Semple-Hulbert block is covered by NTS (National Topographic Survey) of Canada sheets 03E12. Webequie is approximately 500 km north of Thunder Bay within NTS sheets 43 D/10 and 43 D/15. The property comprises 44 claims located in Townships BMA 527863, BMA 527864, BMA 526864 and BMA 526863. Webequie, is the closest fly in native community located on the northern peninsula of Eastwood Island in Winisk Lake, around 550 kilometers north of Thunder Bay, and 450 kilometers north of Sioux Lookout. Local supplies and services are limited, but they do have a Northern grocery and supply store, small hotel, and an airport with gravel landing strip. The local community is typically based on fishing, hunting and trapping. MacDonald Mines hired local workers for exploration work as line cutters and for drill pad construction. Any other supplies and services that were needed were brought in from outside the community from other towns to the south. All access to the Butler property from Webequie is by float/ski plane (from Hearst, Pickle Lake and Nakina) or Eurostar helicopter (Expedition Helicopters).

Webequie is a traditional Ojibway community with a population in excess of six hundred people. Webequie can be accessed by air on a year round basis. Scheduled passenger air service and charter service from Thunder Bay and other surrounding



communities to Webequie are available from Wasaya Airlines. Wasaya provides at least 2 scheduled flights daily with turbo-prop aircraft. A flight to Webequie from Thunder Bay is about 1-2 hours depending on the plane size and type. The runway length is 3500 feet comprising of gravel and is suitable for cargo aircraft with short take off and landing capability. Access by land to Webequie is available for approximately two months of the year by a winter road. Year-round road access is available to Pickle Lake, 250 km to the southwest, or Nakina, 320 km to the southeast. Charter air service to Webequie is available from both of these communities.

Medical facilities are available at the Webequie First Nation Nursing Station, which is usually operated with a few nurses, a Community Health Representative, and two full-time counselors. Nurses are on call for 24 hours a day, and are able to handle most emergencies. A doctor visits the community twice a month. If there is a more serious injury the patient is flown out by a dispatched air ambulance to a hospital in Sioux Lookout, Thunder Bay or Winnipeg. Police services are provided by the Nishnawbe-Aski Police Service, an Aboriginal-based police service.

All facilities that were available for the Butler properties were located in Richard Lake a camp owned at the time by White Pine Exploration. This camp is located approximately 50 kilometers southeast of Webequie with core logging and cutting facilities on site. The camp is operated by Expedition services based out of Cochrane, Ontario with flights servicing the camp from North Star Air based out of Pickle Lake, Ontario and from Hearst Air Service in Hearst, Ontario on a daily basis. The Eurocopter Helicopter was also provided by Expedition services and it assisted in the drill moves, core and equipment transportation. When needed the helicopter was also used to taxi around passengers or supplies that could not be done by plane. The James Bay Lowlands are the large mass of low lying swampland that surrounds James Bay at the south/south eastern end of Hudson Bay in northern Ontario and north-western Quebec. Topographic elevations range from sea level to approximately 180-210 m. Drainage is very poor and the region is essentially characterized by large swamps, peat bogs and muskeg. Diamond drilling and ground geophysics are generally carried out in the winter, when peat swamps and lakes are frozen making drill transport and setup easier. Drilling during the summer requires the construction of drill pads and/or small light drill equipment with limited depth penetration (typically 500m depth penetration). Surface bedrock mapping and prospecting are severely limited due to lack of outcrop, and exploration is almost entirely dependent on geophysical surveying for target selection. The region is characterized by a subarctic climate, with short cool summers and severely cold winters. Mean annual temperatures range from approximately -20°C in the winter to +10°C in the summer. Minimum and



maximum temperatures range from -35°C in the winter to +25°C in the summer. The frost-free period is short, typically 40 to 60 days. During the year there are two periods of freezing and thawing that inhibit the ability to fly ski and float planes in respectively. The fall and spring “break ups” typically last 3-4 weeks and only access to the camp can be conducted with the use of helicopter.

Figure: 1: Semple-Hulbert Project General Location Google Map



Figure 2: Property Claim Map

Figure 3: Semple-Hulbert Property Lease Map



Figure 4: Crone DHEM Loop A, Loop B, Loop C Plan Map



Figure 5: Tx Loop A, Map Showing Details of TDEM Line Coverage

3.0 PERSONNEL

The personnel involved in this project during the reporting period include: Survey Operator: Serge Timoshenko, Evan Barley Data Processing: Kevin Ralph Report: A.M.Khan



4.0 SURVEY METHODS

Crone Pulse EM is a time domain electromagnetic method in which a precise pulse of current with a controlled linear shut off is transmitted through a large loop of wire on the ground and the rate of decay of the induced secondary field is measured across a series of time windows during the off-time. The EMF created by the shutting-off of the current induces eddy currents in nearby conductive material thus setting-up a secondary magnetic field. When the primary field is terminated, this magnetic field will decay with time. The amplitude of the secondary field and the decay rate are dependent on the quality and size of the conductor.

The surface survey was carried out using a time base of 100.00 ms (2.5Hz), with a 1.5 ms shut-off ramp time. Vertical (Z-component) and in-line (X-component) data was collected at a nominal survey interval of 50 meters.

The equipment used on this project was a Crone Pulse EM Borehole system. This includes a 4.8 kW transmitter with a 220V voltage regulator which is powered by an 11 hp motor generator. The Crone Digital Receiver was used to collect the field data. The synchronization between the Transmitter and the Receiver was maintained by a crystal-clock. Data units are nT/s.



5.0 SURVEY PARAMETERS

Table I: Transmitter Loop Coverage

Loop Property Size Corner Coordinates

( meters ) UTM NAD83 Canada Zone 16N

Tx Loop A Semple-Hulbert 1000 x 1500

448251E, 5933212N 447926E, 5932294N 449358E, 5931784N 449671E, 5932741N

Table II: Surface Survey Coverage

Line TX loop Timebase Ramp Current Station Length

Comp (ms) (ms) (Amps) From To (m)

0E Loop 1 100.00 1.5 18 900N 0N 900 XZ

100E Loop 1 100.00 1.5 19 1000N 0N 1000 XZ

200E Loop 1 100.00 1.5 19 1100N 0N 1100 XZ

300E Loop 1 100.00 1.5 19 1100N 0N 1100 XZ

400E Loop 1 100.00 1.5 19 1100N 0N 1100 XZ

500E Loop 1 100.00 1.5 18 1100N 0N 1100 XZ

600E Loop 1 100.00 1.5 18 1100N 0N 1100 XZ

700E Loop 1 100.00 1.5 18 1100N 0N 1100 XZ

800E Loop 1 100.00 1.5 18 1100N 0N 1100 XZ

900E Loop 1 100.00 1.5 18 1100N 50N 1050 XZ

1000E Loop 1 100.00 1.5 18 1100N 0N 1100 XZ

1100E Loop 1 100.00 1.5 18 1100N 0N 1100 XZ

1200E Loop 1 100.00 1.5 18 1100N 0N 1100 XZ

1300E Loop 1 100.00 1.5 19 950N 0N 950 XZ

1400E Loop 1 100.00 1.5 19 800N 0N 800 XZ Cumulative Total Coverage 15700 meters



The following table shows the various time gates that constitute the channel configurations set up in the Crone PEM Receiver used in the surveys discussed in this report. The 100.00 ms (2.5Hz) timebase uses off-time channels 1 – 29.

Table VI: Channel Configuration Channel Start Finish Channel Start Finish

PP ‐2.000e‐04 ‐1.000e‐04

1 4.800e‐05 6.400e‐05 2 6.400e‐05 8.400e‐05

3 8.400e‐05 1.120e‐04 4 1.120e‐04 1.520e‐04

5 1.520e‐04 2.040e‐04 6 2.040e‐04 2.680e‐04

7 2.680e‐04 3.600e‐04 8 3.600e‐04 4.800e‐04

9 4.800e‐04 6.400e‐04 10 6.400e‐04 8.480e‐04

11 8.480e‐04 1.128e‐03 12 1.128e‐03 1.496e‐03

13 1.496e‐03 1.992e‐03 14 1.992e‐03 2.644e‐03

15 2.644e‐03 3.512e‐03 16 3.512e‐03 4.664e‐03

17 4.664e‐03 6.192e‐03 18 6.192e‐03 8.220e‐03

19 8.220e‐03 1.092e‐02 20 1.092e‐02 1.440e‐02

21 1.440e‐02 1.770e‐02 22 1.770e‐02 2.770e‐02

23 2.770e‐02 3.770e‐02 24 3.770e‐02 4.770e‐02

25 4.770e‐02 5.770e‐02 26 5.770e‐02 6.770e‐02

27 6.770e‐02 7.770e‐02 28 7.770e‐02 8.770e‐02

29 8.770e‐02 9.770e‐02

6.0 PRODUCTION SUMMARY

Table IV: Production Summary

01‐Jun‐2011 MOB.

02‐Jun‐2011 Sling gear to grid and prepare for surface survey for tomorrow.

03‐Jun‐2011 Walk loop to find disconnection and set up TX gear for tomorrow's survey.

04‐Jun‐2011 Surveyed line L0E from 0N to 700N on Semple Loop A.

07‐Jun‐2011 Survey d L0E from 700N to 900N on Semple Surface Grid Loop A. Survey L100E from 1000N to 200N on same grid.

08‐Jun‐2011 Surveyed L100E from 200N to 0N and L200E from 0N to 150N on Semple Surface Grid Loop A. Lay borehole Loop for SH11‐02B. Survey ZXY on same hole from 20m to 220m.

09‐Jun‐2011 Surveyed L200E from 150N to 1100N on Semple Surface Grid Loop A.

10‐Jun‐2011 Surveyed L300E on Semple Surface Grid Loop A from 0N to 800N.



11‐Jun‐2011 Surveyed Semple Surface Grid Loop A on L300E from 800N to 1100N and L400E from 1100N to 500N.

12‐Jun‐2011 Pick up 300x300 Loop SH11‐02B. Lay 300x400m loop for SH11‐09. Survey L400E on Semple Surface Grid Loop A from 500N to 0N.

13‐Jun‐2011 Surveyed L1400E from 0N to 800N and L1300E from 950N to 700N on Semple Surface Grid Loop A.

16‐Jun‐2011 Packed tx gear in the heli net; set up tx. Read line 1300e. 950m completed. 1.5km walk from tx to line 1300e

17‐Jun‐2011 Started reading line 1200e. 1.3km walk from tx to line 1200e. Laid out loop for the upcoming borehole survey.

18‐Jun‐2011

Moved borehole gear to the grid. Picked up mg from surface grid and moved it to bh site. Read hole sh11‐07. Acquired gps coordinates for the loop. Picked up loop. Drill move in progress/helicopter not available . Assisted drill move.

19‐Jun‐2011 Read line 1200e with camp helper. Corbin performed mag survey with camp helper.

20‐Jun‐2011 Surveyed line 1100e with camp helper. Corbin performed mag survey with camp helper. Spotted helipad for the padbuilders, 1km away from tx. Line 1200 m away from tx.

21‐Jun‐2011 Surveyed line 1000e with camp helper. Corbin performed mag survey with camp helper. Corbin offsite, Kevin Hynes onsite.

22‐Jun‐2011 Surveyed line 900e.

23‐Jun‐2011

Started reading line 800e. Kevin and Ed resumed mag survey. Kevin and Ed were having problems with the mag. Could not read due to memory issues. I headed out to read line 800e. I was by myself; bear sneaked up on me. Heard something/someone breathing heavy, turned around to find a bear less than 10m away. Called camp, had problems getting a hold of the camp. Finally got a hold of the camp; helicopter chased the bear away.

24‐Jun‐2011 Surveyed line 800e. Kevin and Ed continued mag survey. I was out with Leon. We had a firearm in case bear problem presisted. line 800e. Kevin and Ed continued mag survey.

30‐Jun‐2011 Started walking for line 700e. Kevin had some health issues. Started walking for line 700e by myself ran into the bear. Some delay again on response.

01‐Jul‐2011 Read line 700e.

02‐Jul‐2011 Read line 600e.

04‐Jul‐2011 Started base station, Martin continued mag survey/Read line 500E

05‐Jul‐2011 DMOB.

06‐Jul‐2011 DMOB.



Respectfully submitted, A.M.Khan, M.Sc Crone Geophysics & Exploration Ltd.



APPENDIX I

PROFILE PLAN MAPS

5832000",



APPENDIX II

LINEAR (5-AXIS) PULSE EM DATA PROFILES

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APPENDIX IV

CRONE INSTRUMENT SPECIFICATIONS

SYSTEM DESCRIPTION

The Crone Pulse EM system is a time domain electromagnetic method (TDEM) that utilizes an alternating pulsed primary current with a controlled shut‐off and measures the rate of decay of the induced secondary field across a series of time windows during the off‐time. The system uses a transmit loop of any size or shape. A portable power source feeds a transmitter which provides a precise current waveform through the loop. The receiver apparatus is moved along surface lines or down boreholes.

The transmitter cycle consists of slowly increasing the current over a few milliseconds, a constant current, abrupt linear termination of the current, and finally zero current for a selected length of time in milliseconds. The EMF created by the shutting‐off of the current induces eddy currents in nearby conductive material thus setting‐up a secondary magnetic field. When the primary field is terminated, this magnetic field will decay with time. The amplitude of the secondary field and the decay rate are dependent on the quality and size of the conductor. The receiver, which is synchronized to the off‐time of the transmitter, measures this transient magnetic field where it cuts the surface coil or borehole probe. These readings are across fixed time windows or "channels". SYSTEM TERMINOLOGY Ramp Time

"Ramp time" refers to the controlled shut‐off of the transmitter current. Three ramp times are selectable by the operator; 0.5ms, 1.0ms, and 1.5ms. By controlling the shut‐off rather than having it depend on the loop size and current ensures that the same waveform is maintained for different loops so data can be properly compared.

The 1.5ms ramp is the normally used setting for good conductors. It keeps the early channel responses on scale and decreases the chance of overload. The faster ramp times of 1.0ms and 0.5ms will enhance the early time responses. This can be useful for weak conductors when data from the higher end of the frequency spectrum is desired.

Time Base

Time base is the length of time the transmitter current is off (it includes the ramp time). This also equals the on time of the current. Time bases are available for both 60Hz and 50Hz noise rejection respectively:

8.33ms (30Hz), 16.66ms (15Hz), 50ms (5Hz), 100ms (2.5Hz), 150ms (1.67Hz), 300ms (0.833Hz), 500ms (0.5Hz), 750ms (0.33Hz), 1000ms (0.25Hz)

10ms (25Hz), 20ms (12.5Hz), 50ms (5Hz), 100ms (2.5Hz), 150ms (1.67Hz), 300ms (0.833Hz), 500ms (0.5Hz), 750ms (0.33Hz), 1000ms (0.25Hz)

Since readings are taken during the off cycles, the time base will have an effect on the

receiver channels. Normally, a standard time base is selected for the type of system and survey being used, but this can be changed to suit a particular situation. A longer time base is preferred for conductors of greater time constants, and in surveys such as resistive soundings where more channels are desired.

Zero Time Set

The term "zero time set" or "ZTS" refers to the starting point for the receiver channel measurements. It is manually set on the receiver by the operator thus allowing adjustments for the ramp times and fine tuning for any fluctuations in the transmitter signal.

Crone Pulse EM

System Description

Receiver Channels The rate of decay of the secondary field is measured across fixed time windows which

occupy most of the off‐time of the transmitter. These time windows are referred to as "channels". These channels are numbered in sequence with "1" being the earliest. The analog and datalogger receivers measured eight fixed channels. The digital receiver, being under software control, offers more flexibility in the channel positioning, channel width, and number of channels.

PP Channel

The PEM system monitors the primary field by taking a measurement during the current ramp and storing this information in a "PP channel". This means that data can be presented in either normalized or normalized formats, and additional information is available during interpretation. The PP channel data can provide useful diagnostic information and helps avoid critical errors in field polarity.

Synchronization

Since the PEM system measures the secondary field in the absence of the primary field, the receiver must be in "sync" with the transmitter to read during the off‐time. There are three synchronization methods available: cable connection, radio telemetry, and crystal clock. This flexibility enhances the operational capabilities of the system.

SURVEY METHODS

The wide frequency spectrum of data produced by a Pulse EM survey can be used to provide structural geological information as well as the direct detection of conductive or conductive associated ore deposits. The various types of survey methods, from surface and borehole, have greatly improved the chances of success in deep exploration programs. There are eight basic profiling methods as well as a resistivity sounding mode.

Moving Coil

A small, multi‐turn transmitter loop (13.7m diameter) is moved for each reading while the receiver remains a fixed distance away. This method is ideal for quick reconnaissance in areas of high background conductivity.

Moving Loop

Same as Moving Coil method, but with a larger rectangular transmit loop (100 to 300 meters). This method provides deeper penetration in areas of high background conductivity, and works best for near‐vertical conductors. This method can be used in conjunction with the Moving In‐loop survey for increased sensitivity to horizontal conductors.

Moving InLoop

A rectangular transmit loop of size 100 to 300 meters is moved for each reading while the receiver remains at the center of the loop. This method provides deep penetration in areas of very high background conductivity, and works best for near‐horizontal conductors. It can be used in conjunction with the Moving Loop survey.

Large InLoop

A very large, stationary transmit loop (800m square or more) is used, and survey lines are run inside the loop. This mode provides very deep penetration (700m or more) and couples best with shallow dip conductors (<45 deg.) under the loop.

Deep EM

A large, stationary transmit loop is used, and survey lines are run outside the loop. This mode provides very deep penetration, and couples best with steeply dipping conductors (>45 deg.) outside the loop.

Borehole (Z Component only) Isolated Borehole: A drill hole is surveyed by lowering a probe down a hole and surveying it

with a number of transmit loops laid out on surface. The data from multiple loops gives directional information on the conductors.

Multiple Boreholes: One large transmit loop is used to survey a number of closely spaced holes. The change in anomaly from hole to hole provides directional information. These methods have detected conductors to depths of 2500m from surface and up to 200m from the hole.

3D Borehole

Drill holes are surveyed with both the Z and the XY borehole probes. The X and Y components provide accurate direction information using just one transmit loop. Since the probe rotates as it moves down the hole a correction is required for the X‐Y data. This is accomplished in one of two ways. The measurement of the primary field from the "PP" channel can be used to apply a "cleaning" algorithm to remove most of the secondary field contamination, and compare this to theoretical values. The amount of probe rotation is then calculated, and the correction can be made. The second method involves the use of an optional orientation tool for the X‐Y probe. This attachment uses dip meters to calculate the probe rotation. A third method uses another rotation tool with integrated 3‐axis accelerometers and 3‐axis magnetometers which can be used to correct rotation on steeply dipping holes including vertical.

Underground Borehole

Underground drill holes can be surveyed in any of the above mentioned borehole methods with one or more transmit loops on the surface. Near‐horizontal holes can be surveyed using a push‐rod system.

Resistivity Soundings

By reading a large number of channels in the centre of a transmit loop it is possible to perform a decay curve analysis giving a best‐fit layer earth model using programs such as ARRTI or TEMIX.

EQUIPMENT Transmit Loops

The PEM system can operate with practically any size of transmit loop, from a multi‐turn circular loop 13.7m in diameter, to a 1 or 2 turn loop of any shape up to 1 or 2 kilometers square using standard insulated copper wire of 10 or 12 gauge. The multi‐turn loop is made in two sections with screw connectors. The 10 or 12 gauge loop wire comes on spools in either 300m or 400m lengths. The spools can be mounted on pack frame wire winders for laying out or retrieving.

Power Supply

The PEM system has been produced in 2 varieties: high power (4.8 KW), and low power (2.4 KW). The low power PEM system normally operates with an input voltage from 24V to 240V with a maximum output current of 20 amps. For very low power surveys a 20amp/hr 24V battery can be used. The high power system operates on a continuously variable voltage input up to 240V with a maximum output current of 30 amps. The power supply requires a motor generator and a voltage regulator to control and filter the input voltage to the transmitter.

Specifications: PEM Motor Generator

(2.4 KW) 4.5 hp Robin EH34 engine, 120V 3‐phase alternator (4.8 KW) 11 hp Robin RGV6100 240V/120V generator (1‐phase) cable output to regulator fuse type overload protection steel frame external gas tank

optional packframe for low‐power generator wooden shipping box unit weight: 33kg (2.4 KW); 81kg (4.8 KW) shipping weight: 47kg (2.4 KW); 100kg (4.8 KW)

Specifications: PEM Variable Voltage Regulator

High Power Continuously variable voltage output up to 240V 30 amp maximum current Integrated sealed aluminum case ruggedized for shipping Shipping weight 18kg

Low Power selectable voltage between 24v and 120v 20amp maximum current anodize d aluminum case padded wooden shipping box unit weight 10kg; shipping weight 18kg

fuse and internal circuit breaker protection cable connections to motor generator and transmitter

Specifications: PEM Transmitter

High Power Timebases

8.33ms (30Hz), 10ms (25Hz), 16.66ms (15Hz), 20ms, (12.5Hz), 50ms (5Hz), 100ms (2.5Hz), 150ms (1.67Hz), 300ms (0.833Hz), 500ms (0.5Hz), 750ms (0.33Hz), 1000ms (0.25Hz)

ramp times: 0.5ms, 1.0ms, 1.5ms operating voltage: continuously variable input up to 240V output current up to 30amp maximum optional current control feedback system features constant current output with ±0.1 amp

precision integrated sealed aluminum case ruggedized for shipping with shock protection

Low Power Timebases

8.33ms (30Hz), 10ms (25Hz), 16.66ms (15Hz), 20ms, (12.5Hz), 50ms (5Hz), 100ms (2.5Hz), 150ms (1.67Hz), 300ms (0.833Hz)

operating voltage: 24v to 120v output current: 5amp to 20amp anodized aluminum case optional pack frame unit weight 12.5kg; shipping weight 22kg padded wooden shipping box

monitors for input voltage, output current, shut‐off ramp, tx loop continuity, instrument temperature, and overload output current

automatic shut‐off for open loop, high instrument temperature, and overload fuse and circuit breaker overload protection three sync modes:

built‐in radio and antenna cable sync output for direct wire link to receiver or remote radio crystal clock connection with built‐in optical isolation

Receiver The receiver measures the rate of decay of the secondary field across several time channels.

The Crone Digital Receiver, in use since 1987 uses software control, offering a variety of programmable channel configurations.

Specifications: Digital PEM Receiver

26 bit (156dB) dynamic range operating temperature ‐40°C to 50°C built‐in non‐volatile memory optional pack frame unit weight 15kg; shipping weight 25.5kg padded wooden shipping box Menu driven operating software system offering the following functions:

controls channel positions, channel widths, and number of channels Timebases: 8.33ms (30Hz), 10ms (25Hz), 16.66ms (15Hz), 20ms, (12.5Hz), 50ms (5Hz),

100ms (2.5Hz), 150ms (1.67Hz), 300ms (0.833Hz), 500ms (0.5Hz), 750ms (0.33Hz), 1000ms (0.25Hz)

ramp time selectable sample stacking from 1 to 65536 automatic gain and spike rejection scrolling routines for viewing data graphic display of decay curve and profile with various plotting options routines for memory management control of data transmission provides information on instrument and operating status

Sync Equipment

There are three modes of synchronization available; radio, cable, and crystal clock. The radio sync signal can be transmitted through a booster antenna from either the PEM Transmitter internal radio or through a Remote Radio.

Specifications: Sync Cable

2 conductor, 24awg, Teflon coated approx. 900m per aluminum spool with connectors

Specifications: Remote Radio

operating frequency 27.12mhz 12V rechargeable gel cell battery supply fuse protection sync wire link to transmitter coaxial link to booster antenna anodized aluminum case unit weight 2.7kg

Specifications: Booster Antenna

8m, 4 section aluminum mast guide rope support ¼ wave CB fiberglass antenna range up to 2km coaxial connection to transmitter or remote radio

Specification: Crystal Clocks

heat stabilized crystals 24V rechargeable gel cell battery supply

anodized aluminum case rx unit can be separate or housed in the receiver outlet for external supplementary battery supply

Surface PEM Receive Coil

The Surface PEM Receive Coil picks up the EM field to be measured by the receiver. The coil is mounted on a tripod that can be positioned to take readings of any component of the field.

Specifications: Surface PEM Receive Coil

ferrite core antenna VLF filter 10khz bandwidth two 9v transistor battery supply tripod adjustable to all planes unit weight 4.5kg; shipping weight 13.5kg padded wooden shipping box

Surface SQUID sensor

CSIRO 1‐, 2‐ or 3‐ axis high‐sensitivity superconducting sensor measures magnetic field in the sub‐pT range. Specifications: Surface SQUID sensor

liquid nitrogen cooled, 12 hour operation between reservoir refills low‐noise floor ~350fT/√Hz man‐portable sensor and control system moving loop, or large loop survey configuration solid teflon non‐magnetic housing operational temperature range: ‐40°C to 40°C total system packaged shipping weight (without liquid nitrogen): 62kg

Borehole PEM Z Component Probe

The Z component probe measures the axial component of the EM field. The Z component data is not affected by probe rotation so no correction is required.

Specifications: Borehole PEM Z Component Probe

ferrite core dimensions: length ‐ 1.6m; dia ‐ 3.02cm (3.15cm for high pressure tested probes) internal rechargeable NiCd battery supply replaceable heat shrink tubing for abrasion protection pressure tested for depths 1300m, 2000m, and 2800m packaged in padded cover and aluminum tube shipped in padded wooden box; total weight 17kg

Borehole PEM XY Component Probe

The XY probe measures two orthogonal components of the EM field perpendicular to the axis of the hole. Correction for probe rotation can be achieved by mathematical theoretical primary field reduction or more commonly with an attached orientation tool sensor.

Specifications: Borehole PEM XY Component Probe

ferrite core dimensions: length ‐ 2.01m; dia ‐ 3.02cm internal rechargeable ni‐cad battery supply

selection of X or Y coils by means of a switch box on surface or automatic switching with Digital receiver

replaceable heat shrink tubing for abrasion protection pressure tested for depths to 2800m packaged in padded cover and aluminum tube shipped in padded wooden box; total shipping weight 20kg

Specifications: Orientation Tool

2 axis tilt sensors accuracy ± 0.1 deg. operating range ‐88 to ‐10 deg. dimensions: length ‐ 0.94m; dia ‐ 28.5mm packaged in padded cover and aluminum tube shipped in padded wooden box; total shipping weight 14kg

Specifications: Rotation Angle Direction (RAD) Tool

integrated 3‐axis accelerometers and 3‐axis magnetometers dip and roll accuracy: ±0.5°, azimuth accuracy: ±1.0° operating range: all simultaneous 3D magnetometer borehole survey by station optional continuous logging mode dual 3‐axis sensors provide an alternative complete borehole Dip‐Azimuth measurement dimensions: length – 0.75m; dia – 31.8mm packaged in padded cover and aluminum tube shipped in padded wooden box; total shipping weight 14kg NiCd battery provides all‐day operation

Length ‐ 0.93m; dia – 28.6mm Packaged in padded cover and aluminum tube Shipped in padded wooden box; total shipping weight 14kg

Borehole Equipment

To lower the probe down a drill hole requires a cable and spool, winch assembly frame and cable counter. Borehole surveys also require equipment to "dummy probe" the hole before doing the survey.

Specifications: Borehole Cable

two conductor shielded cable kevlar strengthened lengths are available up to 2600m on three sizes of spools shipped in wooden box

Specifications: Slip Ring

attaches to side of borehole cable spool providing a connection to the receiver while allowing the spool to turn.

VLF filter pure silver contacts

Specifications: Borehole Winch Frame

welded aluminum frame removable axle chain driven, 3 speed gear box hand or optional power winding hand brake and lock

optional chain‐gear safety cover two sizes: standard for up to 1300m cable; large for longer cables shipped in wooden box

Specifications: Borehole Counter

attaches to the drill hole casing calibrated in meters shipped in wooden box; total weight 13kg

Specifications: Dummy Probe and Cable

solid steel or steel pipe same dimensions as borehole probe shear pin connection to dummy cable steel dummy cable on aluminum spool cable mounts on borehole frame various lengths to 2600m on 3 spool sizes.

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