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DETAILED PROJECT EXPERIENCE LIST
(Most recent at top)
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| 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 | ||
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| 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 | ||
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| 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 | ||
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| 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. | ||
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| 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. | ||
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| 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. | |||
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| 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) | ||
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| 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. | |||
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| 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. | |||
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| 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 | ||
