Patent US3769467A successfully refreshed from Google Patents.
Patent US3777004A successfully refreshed from Google Patents.
US3777004A
Expired / Lapsed
US
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Process for heap leaching ores
Assignee: KEY WEST HOLDINGS Inc
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Filing: 1971-05-10
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Granted: 1973-12-04
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Expires: 1991-05-10
Abstract
Abstract A METHOD FOR RECOVERING METAL VALUES FROM LARGE DEPOSITS OF LOW GRADE ORES OR FROM HIGH GRADE ORE EXISTING IN SMALL ORE BODIES IN AN OUTDOOR OPERATION NEAR THE MINE WHICH COMPRISES MAKING A PILE OF THE ORE AND SUCCESSIVELY LEACHING SELECTED DEPTHS OF THE ORE FROM THE TOP OF THE PILE DOWN BY ADDING LEACHING AGENT AND SUFFICIENT MOISTURE TO LEACH THE METAL CONTAINED IN EACH SELECTED DEPTH WITH INTERMITTENT STIRRING OF THE SELECTED DEPTH OF ORE UNTIL THE METAL IS SOLUBILIZED FOLLOWED BY REMOVAL OF THE LEACHED SECTION FROM THE PILE, SEPARATION OF THE LEACH SOLUTION AND SOLID TAILINGS AND RECOVERY OF THE DISSOLVED METAL VALUES FROM THE LEACH SOLUTION.
Inventors
- 👤 A Lankenau
- 👤 J Lake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:01
CPC Classifications
C; C22; C22B; C22B3/00; C01; C01G; C01G43/00; C01G43/01; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |