Mine detail: Greenhorn

Previously called 'Warren Bros.Willow Creek Mines Inc.'

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Location

Lat / long:

40.66402, -122.6961

Resource(M)

Primary:	Copper
Secondary:	Silver, Gold
Ore:	Bornite, Chalcocite, Chalcopyrite, Chrysocolla, Copper, Cuprite, Malachite, Pyrite
Gangue:	Quartz
Orebody form:	TABULAR

Production

Operation type:	Unknown
Deposit type:	Replacement
Production size:	Small
Development status:	Past Producer
Production years:	1911 - 1913 , 1928 - 1930 , 1939

Geology

Host type:	Rhyolite
Structure:	Faults; Planar Shape Of Gouge And Uncrushed Crystals Of Pyrite, Along With Slickenslide Surfaces On Sulfide Bodies Suggest There Faults To Be Pre-Mineral In Age, I * Further Suggest That They May Have Served As Feeder Channels For Mineralizing Solutions. Forming Eastern Limit Of No. 1 And No. 2 Levels Is A Through-Going Fault With Possible Post-Mineral Dip-Slip Displacement Of 50 Ft. East Side Downdropped.
Alteration processes:	Pyritization

References

MRDS	W025304
DEP	10077601
Reference	{Deposit:: ALBERS, J. P., 1965 , ECONOMIC GEOLOGY OF THE FRENCH GULCH QUADRANGLE SHASTA AND TRINITY COUNTIES, CALIF., SPECIAL REPORT 85 , CALIF. DIV. MINES AND GEOLOGY, PG. 35 - 36 .}{Deposit:: LYDON, P. A. AND *RIEN, J. C., 1974 , MINES AND MINERAL RESOURCES OF SHASTA COUNTY CALIF., COUNTY REPORT 6 , CALIF. DIV. MINES AND GEOLOGY, PG. 35 - 37 .}{Production:: LYDON, P. A. AND *RIEN; PG. 36 , (SEE REF.)}
Reporter	Fraticelli, L. A. (Albers, J.)