Commodities
PrimaryThorium
SecondaryCopper, Uranium
Commodity typeM
Deposit
Deposit typeQUARTZ VEINS
Deposit sizeN
Ore controlFAULT ZONE IN WHICH COPPER-BEARING VEINS ARE COMMONLY TENSION FRACTURES AND THORIUM VEINS ARE MAINLY TIGHT SHEARS
Geology
StructureFAULTING OCCURED DURING TWO PERIODS: PRE-CHALLIS WHERE SMALL FAULTS TREND N25 - 40E, DIPPING STEEPLY NW, AND OTHERS TRENDING N15 - 20W. THE LONG YEARIAN FAULT (N 67 E, 68 SE) IS HORIZONTALLY OFFSET BY 6500 FT. POST CHALLIS FAULTING DEVELOPED THE LEMHI PASS (N70W STEEP), BULL MOOSE (N29-50W STEEP), AND DAN PATCH (N38W 50 - 90 SW) FAULTS. THESE THREE FAULTS CONVERGE AT THEIR NW TRENDS., BELT SERIES ROCKS REGIONALLY TREND SW AND DIP 20 TO 50 DEGREES GENERALLY TO THE NORTH.
AlterationBELT ROCKS ARE SLIGHTLY METAMORPHOSED AND SERITIZED.
Economic & production
Development statusProspect
Identification
Deposit ID60000302
MRDS IDD003931
RegionNA
Data scoreC
Coordinates44.93679, -113.4628
References
TRITES, A. F., AND TOOKER, E. W., 1953 , URANIUM AND THORIUM DEPOSITS IN EAST-CENTRAL IDAHO AND SOUTHWESTERN MONTANA: US GEOLOGICAL SURVEY BULL 988-H.SHARP, W. N., AND CAUENDER, W. S., 1962 , GEOLOGY AND THORIUM BEARING DEPOSITS OF THE LEMHI PASS AREA, LEMHI CO., IDA., AND BEAVERHEAD CO., MONT.,: US GEOLOGICAL SURVEY BULL 1126 .GEACH, R. D., 1972 , MINES AND MINERAL DEPOSITS (EXCEPT FUELS), BEAVERHEAD CO., MONTANA,: MONTANA BUR. OF MINES AND GEOLOGY, BULL 85 .STAATZ, M. H., 1972 , GEOLOGY AND DESCRIPTION OF THE THORIUM BEARING VEINS, LEMHI PASS QUAD., IDAHO AND MONTANA: US GEOLOGICAL SURVEY BULL. 1351 .