| Prospect |
Monte Negro |
Production reference |
Ruiz (1998) |
| Country |
Dominican Republic |
Production Period |
1975-1996 |
Reference Location
|
field visit
|
Gold in ounces |
5,335,918 |
| District |
Pueblo Viejo |
Silver in ounces |
24,422,758 |
| Deposit Type |
Epithermal High Sulfidation |
Copper in Tons |
|
| Owners |
Rosario Dominicana |
Lead in Tons |
|
| Partners |
Barrick Gold 60%, GoldCorp 40% |
Zinc in Tons |
|
| Deals |
1991 international bidding process won by Placer Dome |
Aluminum in Tons |
|
|
|
Nickel in Tons |
|
| Resource in Tonnes |
85,500,000 |
Reserve in Tonnes |
70,600,000 |
| Gold grade in ppm |
2.9 |
Gold grade in ppm |
3.0 |
| Silver grade in ppm |
14.0 |
Silver grade in ppm |
15.8 |
| Copper grade in pct |
0.06 |
Copper grade in pct |
0.06 |
| Lead grade in pct |
0 |
Lead grade in pct |
0 |
| Zinc grade in pct |
0.51 |
Zinc grade in pct |
|
| Reference Resource |
Smith et al., 2008 |
Reference reserve |
Smith et al., 2008 |
| Status |
The Pueblo Viejo mine, inactive since June of 1999, was purchased by Placer Dome and is construction in 2010. Capital costs are estimated to run $2,700 million. |
| Drilling |
138,349 meters in 1814 drill holes at a spacing of 60-80 m. |
| Observations |
The Monte Negro deposit contains 8 Moz of the 22.7 Moz resource at Pueblo Viejo. Metallurgical challenges, addressed by the new plant and autoclaves, include high sulfide content (8%), local high copper and arsenic content, high carbon content, and silica encapsulation. |