US3588175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods for mining deep thick oil shale deposits
Assignee: Atlantic Richfield Co
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Filing: 1969-04-15
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Granted: 1971-06-28
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Expires: 1989-04-15
Abstract
Abstract MINING DEEP SUBSURFACE DEPOSITS OF OIL SHALE AND ASSOCIATED MINERALS BY BLASTHOLE STOPPING. A MAN HAULAGE LEVEL IS DRIVEN BENEATH A HORIZONTAL SERIES OF PRODUCTION BLOCKS AND SUBORDINATE LEVELS ARE DRIVEN BETWEEN THE VERTICAL LIMITS OF THE BLOCKS. OUTLETS FOR BROKEN ORE ARE CREATED AT THE BOTTOM OF THE BLOCKS EXTENDING TO THE MAIN HAULAGE LEVEL. THE BLOCKS ARE SEQUENTIALLY DRILLED AND BLASTED TO FORM A SERIES OF STOPES IN PROGRESSIVE STAGES OF DEVELOPMENT SEPARATED BY THIN PILLARS. THE BROKEN ORE IS RECOVERED FROM THE STOPES VIA THE MAIN HAULAGE LEVEL AND THE EMPTY STOPES ARE BACKFILLED.
Inventors
- 👤 Jerry M Whiting
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:01
CPC Classifications
E; E21; E21C; E21C41/00; E21C41/16; E21C41/24
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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |