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| Number | Title | Issue Date |
| 5653945 | Method for processing gold-bearing sulfide ores involving preparation of a sulfide concentrate Provided is a method for processing a gold-bearing sulfide ore which involves maintaining the ore in a substantially oxygen free environment, preferably beginning with comminution of the ore and ending when a desired final concentrate, enriched in sulfide... | 08/05/1997 |
| 5536480 | Method for treating mineral material having organic carbon to facilitate recovery of gold and silver Provided is a process for treating refractory precious metal-containing ores, particularly gold-bearing ores, which are refractory due to the presence of organic carbon, to reduce the ability of organic carbon to interfere with recovery of the precious me... | 07/16/1996 |
| 5458866 | Process for preferentially oxidizing sulfides in gold-bearing refractory ores A process is provided for recovering gold from refractory sulfide ores. Preferred feed materials have multiple different sulfide mineralogies, with gold being primarily contained within one or more, but not all, of the sulfide mineralogies. Sulfide minera... | 10/17/1995 |
