DETAILED PROJECT EXPERIENCE LIST
(Most recent at top)

Tenke in Construction, 2007, Dem. Rep. of Congo
Tenke in Construction, 2007, Democratic Rep. of Congo


22. Tenke-Fungurume Copper-Cobalt Project (2004-2009)
   
Location: Lubumbashi, Democratic Republic of Congo
Ownership: 56% Freeport-McMoRan; 24% Lundin Mining Corp.; 20% Gecamines1
Product(s): Copper, cobalt
Major minerals: Malachite, heterogenite, cobaltite
Mining method: Open pit, Vermeer continuous miner
Mining rate: 26,000 mt/d
Processing method: Grinding, sulfuric acid-sulfur dioxide agitation leaching, SX and EW for copper recovery, intermediate cobalt hydroxide precipitation from bleed stream
Process throughput: 8,000 mt/d
Ore grades: 2.6% Cu; 0.35% Co
Metal recovery: 85% Cu; 77% Co
Metal production: 250 million lb/yr Cu, 18 million lbs/yr Co
Capital cost: US$1.75 billion
Start-up date: 2Q 2009
   
JOM's Responsibility: Overall responsibility to deliver EPCM project scope within budget and on schedule
   
References: 1Freeport-McMoRan Copper & Gold Inc. Press Release Oct 22nd, 2010
  Freeport-McMoRan Copper & Gold Inc. 2008 Form 10-K
  Freeport-McMoRan Copper & Gold Inc. 2007 Form 10-K
  Phelps Dodge Corporation 2006 Form 10-K
 

 
21. Climax Mine Re-start Project (2007-2009)
   
Location: Leadville, Colorado
Ownership: 100% Freeport-McMoRan
Product(s): Molybdenum sulfide
Major minerals: Molybdenite
Mining method: Open pit
Mining rate: 85,000 st/d
Processing method: SAG milling, ball milling, flotation
Process throughput: 28,000 st/d
Ore grade: 0.165% Mo
Metal recovery: 88%
Metal production: ~30 million pounds molybdenum per year
Capital cost: ~US$500 million
Start-up date: Project on hold due to molybdenum market conditions
   
JOM's Responsibility: Overall responsibility to deliver EPCM project scope within budget and on schedule
   
References: Freeport-McMoRan Copper & Gold Inc. 2008 Form 10-K
   

   
20. Conversion of Bagdad Pressure Leaching to Treat Molybdenum Concentrate (2007-2009)
   
Location: Bagdad, Arizona
Ownership: 100% Freeport-McMoRan
Product(s): Molybdenum trioxide
Major minerals: Molybdenite, minor chalcopyrite
Mining method: N/A - Process by-product molybdenum concentrates
Mining rate: N/A
Processing method: High temperature pressure leaching Ð Proprietary Freeport-McMoRan process
Process throughput: Approximately 20,000 mt/yr concentrate
Recovery: Proprietary
Metal production: Up to 20 million lbs/yr Mo
Capital cost: N/A
Start-up date: 2Q 2009
   
JOM's Responsibility: Technology development guidance, overall responsibility to deliver EPCM project scope within budget and on schedule
   
References: Freeport-McMoRan Copper & Gold Inc. 2008 Form 10-K
   

 

Copper Concentrate Leach at Morenci, Arizona
Copper Concentrate Leaching at Morenci, Arizona

 

19. Morenci Medium Temperature Pressure Leaching of Copper Concentrate (2004-2007)
   
Location: Morenci, Arizona
Ownership: 85% Freeport-McMoRan; 15% Sumitomo Metal Mining
Product(s): Copper cathode
Major minerals: Chalcopyrite, chalcocite, covellite
Mining method: N/A - Process copper concentrates
Mining rate: N/A
Processing method: Medium temperature pressure leaching with direct EW and SX/EW for copper recovery. Process converted to high temperature operation in 2008 to increase acid yield as a result of changes in mine plan and economic conditions.
Process throughput: 225,000 st/yr concentrate
Recovery: 97%
Metal production: 145 million lbs Cu per year
Capital cost: ~$100 million
Start-up date: 3Q 2007
   
JOM's Responsibility: Process co-inventor, technology development guidance, overall responsibility to deliver EPCM project scope within budget and on schedule
   
References: 1. Freeport-McMoRan Copper & Gold Inc. 2008 Form 10-K
  2. Freeport-McMoRan Copper & Gold Inc. 2007 Form 10-K
  3. Phelps Dodge Corporation 2006 Form 10-K
  4. Marsden, J. O., Wilmot, J.C. & Smith, R.J. (2007) Medium-temperature pressure leaching of copper concentrates Ð Part IV: Application at Morenci, Arizona. Min. & Met. Proc. J., Vol. 24, No. 4, pp 226-236.
   

   
18. El Abra Primary Sulfide (Bornite) Heap Leaching Project (2004-2009)
   
Location: Calama, Chile
Ownership: 51% Freeport-McMoRan; 49% Codelco
Product(s): Copper cathode
Major minerals: Bornite, chalcopyrite
Mining method: Open pit
Mining rate: ~220,000 mt/d
Processing method: Three-stage crushing, heap leaching, SX, EW
Process throughput: 115,000 mt/d
Ore grade: 0.55% Cu
Recovery: 55%
Metal production: 325 million lbs/yr Cu
Capital cost: US$450 million
Start-up date: 2012 (tentative Ð on hold for economic conditions, copper price)
   
JOM's Responsibility: Technology development guidance, overall responsibility to deliver EPCM project scope within budget and on schedule
   
References: Freeport-McMoRan Copper & Gold Inc. 2008 Form 10-K
   

   

Cerro Verde Cu Project, Peru
Cerro Verde Cu Project, Peru

 

17. Cerro Verde Primary Sulfide Project (2004-2007)
   
Location: Arequipa, Peru
Ownership: 53.56% Freeport-McMoRan; 21.0% SMM Cerro Verde Netherlands BV; 18.44% Compania de Minas Buenaventura S.A.A.; 7.0% other shareholders whose shares are traded on the Lima Stock Exchange
Product(s): Copper sulfide concentrate, molybdenum sulfide concentrate
Major minerals: Chalcopyrite, minor chalcocite
Mining method: Open pit
Mining rate: ~295,000 mt/d
Processing method: Two-stage crushing, high pressure grinding rolls, bulk flotation, copper-molybdenum flotation separation, filtration
Process throughput: 108,000 mt/d
Ore grade: 0.49% Cu
Recovery: 90% mill (x 96% through smelter)
Metal production: 400-450 million lbs/yr Cu; 8 million lbs/yr Mo
Capital cost: US$850 million
Start-up date: 4Q 2007 (original property started in 1976)
   
JOM's Responsibility: Technology (HPGR) selection and application guidance, overall responsibility to deliver EPCM project scope within budget and on schedule
   
References: 1. Freeport-McMoRan Copper & Gold Inc. 2008 Form 10-K and 2007 Form 10-K
  2. Phelps Dodge Corporation 2006 Form 10-K
  3. Vanderbeek, J. L., Linde, T. B., Brack, W. S., & Marsden, J. O. (2006) HPGR Implementation at Cerro Verde. Proc. International Autogenous and Semi-Autogenous Grinding Technology 2006. Eds. Allan, M.J., Major, K., Flintoff, B.C., Klein, B., & Mular, A.L. Dept. Min. Eng., University of British Columbia, Vancouver, Canada. pp 45-61.
   

   
16. Safford Project (2004-2007)
   
Location: Safford, Arizona
Ownership: 100% Freeport-McMoRan
Product(s): Copper cathode
Major minerals: Chrysocolla, copper-iron WAD
Mining method: Open pit
Mining rate: 285,000 mt/d
Processing method: Three-stage crushing, heap leaching, SX, EW
Process throughput: 103,000 mt/d (plus some low grade ore for run-of-mine leaching)
Ore grade: 0.36% Cu
Metal recovery: 66%
Metal production: 205-240 million lbs/yr Cu
Capital cost: US$550 million (2006 basis)
Start-up date: 4Q 2007
   
JOM's Responsibility: Process development, process selection, overall responsibility to deliver EPCM project scope within budget and on schedule
   
References: Freeport-McMoRan Copper & Gold Inc. 2008 Form 10-K
  Freeport-McMoRan Copper & Gold Inc. 2007 Form 10-K
  Phelps Dodge Corporation 2006 Form 10-K
   

   
15. Morenci Engineered Heap Project (2004-2007)
   
Location: Morenci, Arizona
Ownership: 85% Freeport-McMoRan; 15% Sumitomo Metal Mining
Product(s): Copper cathode
Major minerals: Chalcopyrite/covellite
Mining method: Open pit
Mining rate: 1,100,000 st/d
Processing method: Enhanced biological stockpile leaching at run-of-mine size (Proprietary)
Process throughput: Variable: 100,000-200,000 st/d (188 million tons total)
Ore grade: ~0.19%
Metal recovery: Not available
Metal production: Not available
Capital cost: Not available
Start-up date: 3Q2007
   
JOM's Responsibility: Overall responsibility to deliver EPCM project scope within budget and schedule. Technology development guidance and oversight
   
References: Phelps Dodge Corporation, Investment Community Presentation, March 6th, 2006
   

   

Copper Concentrate Leach at Bagdad, Arizona
Copper Concentrate Leaching at Bagdad, Arizona

 

14. Bagdad High Temperature Pressure Leaching of Copper Concentrate (2001-2003)
   
Location: Bagdad, Arizona
Ownership: 100% Freeport-McMoRan
Product(s): Copper cathode
Major minerals: Chalcopyrite
Mining method: N/A - Process copper concentrates
Mining rate: N/A
Processing method: High temperature pressure leaching with direct EW and SX/EW for copper recovery.
Process throughput: 57,300 mt/yr concentrate
Metal recovery: 98.50%
Metal production: 16,000 mt (35 million lbs) copper per year
Capital cost: $43 million (including modifications to existing SX circuit and new EW capacity)
Start-up date: 2Q 2003
   
JOM's Responsibility: Overall responsibility to deliver EPCM project scope within budget and schedule.
  Process co-inventory, technology development and implementation guidance and oversight
   
References: 1. Marsden, J. O., Brewer, R. E., & Hazen, W. W. (2003) Copper Concentrate Leaching Developments by Phelps Dodge Corporation. Proc. Hydrometallurgy 2003 Conference, Vol. 2. Eds. Young, C., Alfantazi, A., Anderson, C., James, A., Dreisinger, D. & Harris, B. The Minerals, Metals & Materials Society, Warrendale, Pennsylvania. pp 1429-1446.
  2. Marsden, J. O. & Brewer, R. E. (2003) Hydrometallurgical Treatment of Copper Concentrates by Phelps Dodge at Bagdad. Proc. ALTA 2003 Copper-8 Conference. ALTA Metallurgical Services, Castlemaine, Victoria, Australia.
 

 
13. El Abra Run-of-Mine Leaching Project (2000-2002)
   
Location: Calama, Chile
Ownership: 51% Freeport-McMoRan; 49% Codelco
Product(s): Copper cathode
Major minerals: Atacamite, chrysocolla
Mining method: Open pit
Mining rate: ~300,000 mt/d
Processing method: Run-of-mine stockpile leaching, SX and EW
Process throughput: ~100,000 mt/d
Ore grade: 0.30% Cu
Metal recovery: 45-50%
Metal production: 100 million lbs/yr Cu
Capital cost: $70 million
Start-up date: 2002
   
JOM's Responsibility: Overall responsibility to deliver EPCM project scope within budget and schedule.
  Process development and implementation guidance and oversight.
   
References: Hernandez, R., Schlitt, J. & Lopez, M.E. (2003) The El Abra Run-of-Mine Leach Testwork Program. Proc. Copper-Cobre 2003 Conference, Vol. VI, Book 1. Eds. P.A. Riveros, D.G. Dixon, D.B. Dreisinger, & J.H. Menacho. Can. Inst. Min., Met., & Pet., Montreal, Canada. pp 13-28.
   

 

Morenci Biological Heap Leach, Arizona
Morenci Biological Heap Leach, Arizona

 

12. Morenci Biological Heap Leaching (`998-2001)
   
Location: Morenci, Arizona
Ownership: 85% Freeport-McMoRan; 15% Sumitomo Metal Mining
Product(s): Copper cathode
Major minerals: Chalcocite
Mining method: Open pit
Mining rate: ~700,000 st/d
Processing method: Three-stage crushing, agglomeration, sulfuric acid heap leaching, SX and EW for copper recovery
Process throughput: 85,000 st/d
Ore grade: 0.52% Cu
Metal recovery: 76%
Metal production: 240 million lbs/yr Cu
Capital cost: US$220 million
Start-up date: 2001
   
JOM's Responsibility: Process development oversight and guidance, metallurgical design
   
References: O'Brien, M.F., Griffin, J.B., Cuthbertson, W.F., Lamana, J.R. & Wilton, L.E. (2003) Proc. Copper-Cobre 2003 Conference, Vol. VI, Book 1. Eds. P.A. Riveros, D. Dixon, D.B. Dreisinger & J. Menacho. Can. Inst. Min., Met. & Pet., Montreal, Canada. pp 39-52.
   

   

Candelaria Mine, Chile
Ceramic Disc Filters at Candelaria, Copiapo, Chile

 

11. Candelaria Phase II Expansion Project (1996-1997)
   
Location: Copiapo, Chile
Ownership: 80% Freeport-McMoRan, 20% Sumitomo Metal Mining
Product(s): Copper sulfide concentrate
Major minerals: Chalcopyrite, pyrite
Mining method: Open pit
Mining rate: 230,000 mt/d
Processing method: Primary crushing, SAG milling & pebble crushing, ball milling, flotation, concentrate dewatering, ship through Candelaria-owned port facilities
Process throughput: 64,000 mt/d
Ore grade: 0.94% Cu
Metal recovery: 95% mill (x 96% through smelter)
Metal production: 440 million lbs Cu/yr
Capital cost: US$320 million
Start-up date: 1997
   
JOM's Responsibility: Manager Ð Concentrator Operations and Project Manager
   
References: 1. Marsden, J. O. & Ogonowski, D. L. (1999) The Candelaria concentrator expansion project. SME Annual Meeting Preprint No. 99-139. Society for Mining, Metallurgy & Exploration, Inc., Littleton, Colorado.
  2. Marsden, J .O. (1998) Operating ideas that have saved me some money Ð copper milling at Candelaria. Proc. SME Plant Operators Forum, Orlando, Florida. Ed. Halbe, D. N., Society for Mining, Metallurgy & Exploration, Inc. pp 110-124.
   

   
Ceramic Disc Filtration, Candelaria, Chile
Candelaria Cu-Au mine, Chile
Ceramic Disc Filtration, Candelaria, Chile
Candelaria Port, Caldera, Chile

 

10. Candelaria Copper-Gold Project (1995-1998)
   
Location: Copiapo, Chile
Ownership: 80% Freeport-McMoRan; 20% Sumitomo Metal Mining
Product(s): Copper sulfide concentrate
Major minerals: Chalcopyrite, pyrite
Mining method: Open pit
Mining rate: 100,000 mt/d
Processing method: Primary crushing, SAG milling & pebble crushing, ball milling, flotation, concentrate dewatering, ship through Candelaria-owned port facilities
Process throughput: 30,400 mt/d
Ore grade: 1.0% Cu
Metal recovery: 93% mill (x 96% through smelter)
Metal production: 225 million lbs Cu/yr
Capital cost: US$500 million
Start-up date: 1994
   
JOM's Responsibility: Manager Ð Concentrator Operations
   
References: Marsden, J.O., Pennington, R.I., Rocher, W. & Miranda, D. (1995) The Candelaria Copper-Gold Concentrator. Proc. Copper-Cobre 95 Conference, Santiago, Chile. Vol. II. Eds. Casali, A., Dobby, G.S., Molina, C., & Thoburn, W. Can. Inst. Min., Met. & Pet., Montreal, Quebec, Canada. pp 5-24.
   

   
9. McDonald Gold Project (1993-1995)
   
Location: Lincoln, Montana
Ownership: 72.25% Phelps Dodge; 27.75% Canyon Resources
Product(s): Gold and silver
Major minerals: Gold, silver
Mining method: Open pit
Mining rate: 160,000 st/d
Processing method: Three-stage crushing, heap and ROM leaching with cyanide, carbon-in-columns for gold and silver recovery, gold and silver bullion smelting
Process throughput: 30,000 st/d heap leach, 20,000 st/d run-of-mine leach
Ore grades: 1.1 g/st Au heap leach, 0.35 g/st Au run-of-mine leach
Metal recovery: 76% heap leach, 50% run-of-mine leach
Metal production: 285,000 oz/yr Au heap leach, 40,000 oz/yr Au run-of-mine leach
Capital cost: US$240 million (feasibility study estimate)
Start-up date: N/A
   
JOM's Responsibility: Project Manager
   
References: McDonald Gold Project Feasibility Study, by Kvaerner for Phelps Dodge Corporation
   

 
8. Witkop Fluorspar Expansion Project (1991-1993)
   
Location: Zeerust, Northwestern Cape Province, Republic of South Africa
Ownership: 100% Phelps Dodge
Product(s): Fluorspar concentrate (calcium fluoride)
Major minerals: Fluorspar
Mining method: Open pit
Mining rate: 2,700 mt/d
Processing method: Three-stage crushing, ball milling, flotation, dewatering, shipping.
Process throughput: 1,800 mt/d
Metal production: 45,000 mt CaF2 per yr
Capital cost: N/A
Start-up date: N/A
   
JOM's Responsibility: Consulting metallurgist for owner (Phelps Dodge), metallurgical oversight for production, optimization and expansion
   
References: Marsden, J.O. (1992) Phelps Dodge Corporation. Internal communication.
   

 
7. Black Mountain Minerals (1990-1993)
   
Location: Aggeneys, Northwestern Cape Province, Republic of South Africa
Ownership: 55% Gold Fields of South Africa; 45% Phelps Dodge
Product(s): Copper, lead & zinc sulfide concentrates
Major minerals: Chalcopyrite, galena, sphalerite, pyrrhotite
Mining method: Underground
Mining rate: 5,000 mt/d
Processing method: Three-stage crushing, rod and ball milling, sequential differential flotation, concentrates dewatering, storage and shipping
Process throughput: 3,400 mt/d
Ore grades: 0.36% Cu, 7.0% Pb, 3.0% Zn, 90 g/t Ag
Metal recovery: 68% Cu, 90% Pb, 80% Zn, 83% Ag
Metal production: 3,000 mt/y copper, 75,000 mt/y lead, and 30,000 mt/y zinc
Capital cost: ~US$200 million
Start-up date: 1979
   
JOM's Responsibility: Consulting metallurgist for 45% owner, Phelps Dodge Corporation
   
References: Beck, R.D. & Chamart, J.J. (1980) The Broken Hill Concentrator of Black Mountain Mineral Development Co. (Pty) Ltd., South Africa. Proc. of Conference on Complex Sulphide Ores. Inst. Min. & Met., London, England.
   

 
6. Chimney Creek Refractory Ore Development Project (1989-1990)
   
Location: Winnemucca, Nevada
Ownership: 100% Gold Fields Mining Corporation
Product(s): Gold and silver
Major minerals: Gold, silver, pyrite, minor arsenopyrite
   
JOM's Responsibility: Metallurgical testing oversight, process development, process evaluation and selection
   
References: Marsden, J.O. (1992) Process Selection for Gold Extraction. Abstract only in Proc. Randol Gold Forum, Vancouver, B.C., Canada. March 1992. (Full manuscript available from author)
   

 

Chimney Creek Gold Mine, Nevada
SAG and Ball Mills at Chimney Creek Mine, Winnemucca, Nevada

 

5. Chimney Creek Gold Project (1986-1990)
   
Location: Winnemucca, Nevada
Ownership: 100% Gold Fields Mining Corporation
Product(s): Gold and silver
Major minerals: Gold, silver
Mining method: Open pit
Mining rate: 7,500 st/d
Processing method: Primary crushing, SAG-ball milling, agitated cyanide leaching, carbon-in-columns and carbon-in-pulp gold and silver recovery, zinc precipitation from carbon eluate, mercury removal and recovery, gold and silver bullion smelting.
  Low grade ore processed by heap leaching
Process throughput: 2,400 st/d mill, 4,000 st/d low grade heap leach
Ore grade: 6.0 g/mt Au mill, 1.2 g/t heap leach
Metal recovery: 95% mill, 65% heap leach
Metal production: 165,000 oz/yr Au mill, 35,000 oz/yr Au heap leach
Capital cost: ~US$90 million
Start-up date: 1987
   
JOM's Responsibility: Chief Metallurgist (design, construction, commissioning)
   
References: 1. Arnold, J.R. (1990) Gold Recovery at Gold Fields Ð Chimney Creek. Proc. World Gold '89. Eds. R.B.Bhappu & R.J. Harden. SME, Littleton, CO. pp 251-260.
  2. Marsden, J.O., Gleason, M.F., Mansanti, J.G., & Arnold, J.R. (1990) Integrated Process Control at Gold Fields' Chimney Creek Mine. SME/AIME Control Ô90 Symposium, Salt Lake City, Utah.
  3. Marsden, J.O. & Arnold, J.R. (1990) Metallurgical Accounting at Gold Fields' Chimney Creek Mine. SME/AIME Control '90 Symposium. Salt Lake City, Utah. February 1990.
  4. Marsden, J.O. (1990) Practical Aspects of the Chemistry of Zinc Precipitation from High Temperature Carbon Eluates. Proc. Randol Gold Forum, Squaw Valley, California. September 1990.
  5. Marsden, J.O., Gleason, M.F., Mansanti, J.G., & Arnold, J.R. (1989) Integrated Process Control System at Gold Fields' Chimney Creek Mine. Proc. Inst. Min. & Met. - Metallurgy '89 Conference, London.
  6. Mansanti, J.G., Arnold, J.R., Gourdie, J.H. and Marsden, J.O. (1989) The Double Thickener Circuit at Gold Fields' Chimney Creek Mine. Min. & Met. Proc. J., November 1989. pp 179-185.
   

 
Rod and Pebble Milling at East Driefontein, South Africa
Rod and Pebble Milling at East Driefontein, South Africa
Rod and Pebble Milling at East Driefontein, South Africa
Gold Pour at East Driefontein, South Africa


4. East Driefontein Gold Mine (1982-1986)
   
Location: Carletonville, Transvaal, Republic of South Africa
Product(s): Gold
Major minerals: Gold, silver, pyrite, pyrrhotite
Mining method: Underground Ð sub level stoping
Mining rate: ~10,000 mt/d
Processing method: Three-stage crushing, rod milling, ball milling, agitated cyanide leaching, Merrill-Crowe precipitation, gold and silver bullion smelting
Process throughput: 7,800 mt/d
Ore grade: 12.6 g/mt
Metal recovery: 98%
Metal production: 1,100,000 oz/yr Au
Capital cost: N/A
Start-up date: 1972
   
JOM's Responsibility: Assistant plant superintendent, plant metallurgist, plant supervisor, shift supervisor, operator
   
References: 1. Marsden, J.O. & Van Der Westhuizen, J.H.L. (1985) Double-vee Clarification of Pregnant Gold-Bearing Solution at the East Driefontein Gold Mine. Mine Metallurgical Managers' Assoc. of South Africa. Volume 86/2. South African Inst. Min. & Met., Johannesburg, South Africa. pp 29-49.
  3. Marsden, J.O. (1983) East Driefontein Gold Plant Ð Milling. Internal Communication.
  4. Marsden, J.O. (1984) East Driefontein Gold Plant Ð Cyanide Section. Internal Communication.
   

 

Heap Leaching at Ortiz Gold Mine, New Mexico
Heap Leaching at Ortiz Gold Mine, New Mexico

 

3. Ortiz Gold Mine (1981)
   
Location: Cerillos, New Mexico, USA
Ownership: 100% Gold Fields Mining Corporation
Product(s): Gold and minor silver
Major minerals: Gold
Mining method: Open pit
Mining rate: 4,000 mt/d
Processing method: Three-stage crushing, agglomeration, cyanide heap leaching, carbon-in-columns for gold and silver recovery, electrowinning and electroplating from carbon eluate, gold and silver bullion smelting
Process throughput: 1,850 mt/d
Ore grade: 1.7 g/mt
Metal recovery: 75-80%
Metal production: 30,000 oz/yr Au
Capital cost: US$13 million
Start-up date: 1980
   
JOM's Responsibility: Metallurgical training and development, heap leach testing
   
References: McQuiston, F.W. & Shoemaker, R.S. (1980) Gold and Silver Cyanidation Plant Practice Vol. II. Am. Inst. Min., Met. & Pet. Eng. pp 45-52.
   

 
2. Spitzkopje Uranium Project (1980)
   
Location: Namibia/South West Africa
Product(s): Uranium trioxide (yellowcake)
Major minerals: Uraninite
Mining method: Open pit
Mining rate: N/A
Processing method: Alkaline leaching, SX, precipitation
Process throughput: Under development
Metal recovery: >90%
Metal production: 4,000 t/yr
Capital cost: N/A
Start-up date: N/A
   
JOM's Responsibility: Metallurgical testing and process development
   
References: Marsden, J.O. (1980) Gold Fields of South Africa. Internal Communication.
   

 
1. Libanon Gold Mine (1978-1979)
   
Location: Westonaria, Transvaal, Republic of South Africa
Product(s): Gold and silver
Major minerals: Gold, silver, pyrite
Mining method: Underground Ð sub level stoping
Mining rate: ~7,000 mt/d
Processing method: Three-stage crushing, rod milling, ball milling, agitated cyanide leaching, Merrill-Crowe precipitation, gold and silver refining
Process throughput: 4,800 mt/d
Ore grade: 8 g/mt Au
Metal recovery: 96%
Metal production: 420,000 oz/yr Au
Capital cost: N/A
Start-up date: 1934
   
JOM's Responsibility: Metallurgical training and development
   
References: Marsden, J.O. (1979) Libanon Gold Mine Notes. Gold Fields of South Africa. Internal communication