MINING METHODS AND COSTS--LA SAL MINING AND DEVELOPMENT CO., LA SAL URANIUM MINE, SAN JUAN COUNTY, UTAH
Technical Report
·
OSTI ID:4349723
The La Sal ore body is in the Chinle (Triassic) formation. It is tabular and dips with the enclosing beds about 8 deg southwest. The ore body is generally 4 to 8 ft thick but in a few places is as much as 20 ft thick. It is being developed by a series of strike drifts and dip inclines, driven wlthin the ore stratum on about 100-ft centers. A haulage level driven beneath the ore body is connected by raises to the upper workings. The waste rock that comprises the back of the ore body lacks the strength and rigidity to permit a standard room- and-pillar method of mining to be used. Therefore, experimental mining was begun in March 1956, and a method was developed that permits almost complete extraction of each block of ore, after which the back is induced to cave. It is a retreating room-and-plllar method, based on the removal of 18-ft panels, and has proved successful under conditions that are encountered in the La Sal mine. (auth)
- Research Organization:
- Bureau of Mines
- NSA Number:
- NSA-12-001377
- OSTI ID:
- 4349723
- Report Number(s):
- BM-IC-7803
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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