
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 |
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Freeport-McMoRan Copper & Gold Inc. 2008 Form 10-K |
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Freeport-McMoRan Copper & Gold Inc. 2007 Form 10-K |
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Phelps Dodge Corporation 2006 Form 10-K |
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21. Climax Mine Re-start Project (2007-2009) |
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|
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 |
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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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|

Copper Concentrate Leaching at Morenci, Arizona
|
19. Morenci Medium Temperature Pressure Leaching of Copper Concentrate (2004-2007) |
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|
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. |
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18. El Abra Primary Sulfide (Bornite) Heap Leaching Project (2004-2009) |
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|
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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|

Cerro Verde Cu Project, Peru
|
17. Cerro Verde Primary Sulfide Project (2004-2007) |
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|
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. |
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16. Safford Project (2004-2007) |
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|
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 |
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|
15. Morenci Engineered Heap Project (2004-2007) |
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|
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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|

Copper Concentrate Leaching at Bagdad, Arizona
|
14. Bagdad High Temperature Pressure Leaching of Copper Concentrate (2001-2003) |
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|
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. |
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13. El Abra Run-of-Mine Leaching Project (2000-2002) |
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|
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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Morenci Biological Heap Leach, Arizona
|
12. Morenci Biological Heap Leaching (`998-2001) |
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|
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 |
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|
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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Ceramic Disc Filters at Candelaria, Copiapo, Chile
|
11. Candelaria Phase II Expansion Project (1996-1997) |
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|
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 |
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|
JOM's Responsibility: |
Manager Ð Concentrator Operations and Project Manager |
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|
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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Candelaria Cu-Au mine, Chile |

Candelaria Port, Caldera, Chile |
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10. Candelaria Copper-Gold Project (1995-1998) |
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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 |
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|
JOM's Responsibility: |
Manager Ð Concentrator Operations |
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|
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. |
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9. McDonald Gold Project (1993-1995) |
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|
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 |
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|
JOM's Responsibility: |
Project Manager |
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|
References: |
McDonald Gold Project Feasibility Study, by Kvaerner for Phelps Dodge Corporation |
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8. Witkop Fluorspar Expansion Project (1991-1993) |
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|
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 |
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|
References: |
Marsden, J.O. (1992) Phelps Dodge Corporation. Internal communication. |
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7. Black Mountain Minerals (1990-1993) |
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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 |
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|
JOM's Responsibility: |
Consulting metallurgist for 45% owner, Phelps Dodge Corporation |
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|
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. |
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6. Chimney Creek Refractory Ore Development Project (1989-1990) |
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|
Location: |
Winnemucca, Nevada |
Ownership: |
100% Gold Fields Mining Corporation |
Product(s): |
Gold and silver |
Major minerals: |
Gold, silver, pyrite, minor arsenopyrite |
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JOM's Responsibility: |
Metallurgical testing oversight, process development, process evaluation and selection |
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|
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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|

SAG and Ball Mills at Chimney Creek Mine, Winnemucca, Nevada
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5. Chimney Creek Gold Project (1986-1990) |
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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 |
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|
JOM's Responsibility: |
Chief Metallurgist (design, construction, commissioning) |
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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. |
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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. |
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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. |
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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. |
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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. |
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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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Rod and Pebble Milling at East Driefontein, South Africa |

Gold Pour at East Driefontein, South Africa |
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4. East Driefontein Gold Mine (1982-1986) |
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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 |
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|
JOM's Responsibility: |
Assistant plant superintendent, plant metallurgist, plant supervisor, shift supervisor, operator |
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|
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. |
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3. Marsden, J.O. (1983) East Driefontein Gold Plant Ð Milling. Internal Communication. |
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4. Marsden, J.O. (1984) East Driefontein Gold Plant Ð Cyanide Section. Internal Communication. |
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|

Heap Leaching at Ortiz Gold Mine, New Mexico
|
3. Ortiz Gold Mine (1981) |
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|
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 |
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JOM's Responsibility: |
Metallurgical training and development, heap leach testing |
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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. |
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2. Spitzkopje Uranium Project (1980) |
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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 |
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|
JOM's Responsibility: |
Metallurgical testing and process development |
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References: |
Marsden, J.O. (1980) Gold Fields of South Africa. Internal Communication. |
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1. Libanon Gold Mine (1978-1979) |
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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 |
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|
JOM's Responsibility: |
Metallurgical training and development |
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References: |
Marsden, J.O. (1979) Libanon Gold Mine Notes. Gold Fields of South Africa. Internal communication |