eco-friendly recovery of gold and copper for the small ... · 1. to identify factors affecting the...
TRANSCRIPT
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Project
27 June 2014
Herman D. Mendoza, Dr. Eng.
Department of Mining, Metallurgical, and Materials EngineeringCollege of Engineering, University of the Philippines
ECO-FRIENDLY Recovery of GOLD and COPPER for the
Small-Scale Mining Industry
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ERDT BetterMine Project
PROJECT D : Alternative Methods to
Amalgamation and Cyanidationin the Recovery of Gold
PROJECT C: Copper Flotation Technology for
Small Scale Mining
Department of Mining, Metallurgical, and Materials EngineeringCollege of Engineering, University of the Philippines
Gold-Copper INTEGRATED Mineral Processing
PILOT PLANT
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Background
There are around 300,000 small- miners operating in the Philippines;
Small-scale miners in 30 of the country’s 80 provinces account for up to 70-75 percent of the gold mined in the Philippines;
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Major Concerns
• AmalgamationMercury
• Only 40 – 50% recovery of gold
• Non-recovery of other valuable minerals of copper, lead, zinc, etc.
Low Recovery
• CyanidationCyanide
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Small Scale Mining operations recover gold byeither Cyanidation and/or Amalgamation becauseit is simple;
Cyanidation and Amalgamation are bothhazardous processes because chemicals are usedfor recovery gold that have been long proven tocause adverse effects to health and theenvironment;
Background
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The use of low-end technologies in crushing andgrinding of ores leads to lack of liberation andminimum exposure of gold values which results ininefficient separation and low recoveries of goldvalues during Cyanidation and/or AmalgamationProcesses. Recovery is only 40 to 50%:
Background (Technical)
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To develop CLEAN and SUSTAINABLEtechnology for the Small-Scale MiningIndustry to separate and recover gold andother metal/mineral values effectively andefficiently from Philippine ores.
CHALLENGE
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PROJECT PILOT AREAS
BAGUIO Area
BICOL Area
DAVAO Area
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BAGUIO Area Project Site: Camp 6 and Kias, Tuba, Benguet
SSM Organization: Benguet Federation of Small Scale Miners Inc. (BFSSM)
Camp 6 Explorers Small Scale Miners,. Inc. (CESSMAI). Camp 6, Tuba, Benguet
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BICOL Area Project Site: Paracale and Jose Panganiban, Camarines Norte
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DAVAO Area Project Site: Diwalwal, Mt. Diwata, Compestela
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Types of Gold (Au) ores
Baguio15.27 gm-Au/MT
Bicol12.91 gm-Au/MTwith Copper values
Diwalwal26.12 gm-Au/MT
with Copper and Zinc values
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FRAMEWORK Project Implementation
MineralogicalExamination
SamplePreparation
ALTERNATE PROCESS TESTS
CONVENTIONAL PROCESS TESTS
OPTIMIZATION
PILOT PLANTTESTING
ECONOMICANALYSIS
IMPLEMENTATION
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1. To identify factors affecting the effective recovery ofgold values by flotation and gravity concentrationtechnologies;
2. To establish optimum operating conditions for theefficient and effective recovery of gold (includingother minerals like copper and zinc) using flotationand gravity concentration technologies; and,
3. To implement a pilot-plant testing for gold and othermineral values with provisions of tailings disposal andtreatment.
Project OBJECTIVES
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Metallurgical Testing
Enhanced Gravity Concentration• Separation of fine gold values
Flotation•Separation of fine gold values associated
with sulphide minerals, like pyrite (FeS2 )
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Enhanced Gravity Concentrator ( FALCON)
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Flotation Tests
The separation of valuable minerals from gangue by altering the surface properties of the minerals using reagents and recovering the valuable minerals in the froth phase
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MINERAL PROCESSING
DIWALWAL Gold Ore
BICOL Gold Ore
BAGUIO Gold Ore
PROCESS FLOW
Tails
CONCENTRATE
ORE
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DIWALWAL Gold Ore
200 µm
100 µm
gold
pyrite
pyrite
gold
gold
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Size Reduction and Sizing
Concentration DewateringTailings
Treatment and Disposal
ORE
Jaw Crusher
Screen
Roll Crusher
Ball Mill
Hydrocyclone
FALCONGravityConcentrator
TABLE
FLOTATION
GOLD Concentrate
Thickener 1 Thickener 2
Thickener 3
Thickener 4
Water Reservoir
For Recycling
FLOWSHEET : Mineral Processing of DIWALWAL Gold Ore
Tailings Settling Ponds
Solids Wastewater
Remediation &
Vegetation
Treatment
Clean Water
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FINAL SET-UP OF PILOT PLANT
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Summary
1. Environmentally-friendly process(Flotation-Gravity Concentration Process) NO Mercury NO Cyanide
2. Increased Gold Recovery 40-50% to 90%
3. Recover other valuable minerals Copper and zinc minerals
4. Tailings Disposal and Treatment system4. Flexible Operation5. Low capital and operating expenses
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http://www.mgb.gov.ph/Files/Statistics/MetallicProduction.pdf
Philippine Metallic Mineral Production
of Gold production come from the small-scale mining industry
SOURCE: http://www.tribune.net.ph/index.php/business/item/6846-tax-sends-bsp-gold-purchase-down-to-75
ACCORDING TO MINES AND GEOSCIENCES BUREAU OF DENR
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Project
JUNE 2014
Department of Mining, Metallurgical, and Materials EngineeringCollege of Engineering, University of the Philippines
FIELD-TESTING of the INTEGRATED Gold-Copper Mineral Processing
Pilot Plant in the Regions
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1. To investigate the operating parameters for optimum recoveryof gold and other mineral values using gravity concentration /flotation and extraction technologies, and the application of anintegrated treatment and disposal of tailing materials;
2. To evaluate the operations and engineering aspects of gravityconcentration-flotation technology in order to develop acustom-made gold-copper mineral processing facilities for localutilization; and,
3. To formulate operational protocols and recommendpolicies for the nationwide imlplementation of safeand environmentally-friendly integrated gold-copperprocessing plants for the Philippine small scale miningindustry.
Objectives:
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Field-Testing Project Framework
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PROJECT PILOT AREAS
BAGUIO Area
BICOL Area
DAVAO Area
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First SITE
Field-Testing of the INTEGRATED Gold-Copper Mineral Processing
Pilot Plant in the BENGUET
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PROPOSED SITE 1: ITOGON, BENGUET
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30
Responsibly PRO-ENVIRONMENT (does not use hazardous processes thus SAFE for the people andthe community )
Responsibly PRO-FILIPINO(so that the nation is given its due share in the bounties of its natural patrimony)
This NEW Technology
Responsibly PRO-POOR(so that those bounties are enjoyed by the SSM Community)
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Thank you very much !!!