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| Number | Title | Issue Date |
| 5851499 | Method for pressure oxidizing gold-bearing refractory sulfide ores having organic carbon Provided is a method for treating refractory gold-bearing ores that have both sulfide material with which the gold is associated and from which the gold is difficult to separate and having organic carbonaceous material having an affinity for at least one ... | 12/22/1998 |
| 5837210 | 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... | 11/17/1998 |
| 5402991 | Tube connector for heap leach mining, drip tube percolation system, and method for connecting same A tube connector utilized in connecting a drip tube to a header pipe in a heap leach mining percolation system which provides for strength at the normally weak connection between the header pipe and the drip tube. The tube connector includes a housing pro... | 04/04/1995 |
| 5123956 | Process for treating ore having recoverable gold values and including arsenic-, carbon- and sulfur-containing components by roasting in an oxygen-enriched gaseous atmosphere Recovery of a precious metal value from refractory carbonaceous and sulfidic ores, concentrates or tailings which also include arsenic-containing components is improved by roasting the ore or ore concentrate in an oxygen-enriched gaseous atmosphere having... | 06/23/1992 |
