Description
J.M. Brawley, J.M. Corey, E.R. Hicks
Deposit
Deposit typeEPITHERMAL VEINS, TYPICALLY WITH LITTLE OR NO KNOWN WALLROCK DISSEMINATION.
Model150: Epithermal vein, Comstock
Deposit sizeL
Ore controlNE-STRIKING FAULTS OCCUPIED BY QUARTZ-ADULARIA (+AU +AG) VEINS. THREE STAGES OF VEINING ARE RECOGNIZED. PRECIOUS METAL DEPOSITION IS ASSOCIATED WITH THE SECOND STAGE OF VEINING, PROBABLY DURING BOILING OF THE HYDROTHERMAL FLUID.
Geology
StructureSTEEP N-S STRIKING FAULTS OFFSET THE MINERALIZED NE-STRIKING FAULTS., A YOUNG, LESS THAN 3 MA OLD, BROAD REGIONAL UPWARP EXTENDS FORM THE SOUTHWEST OF THE BODIE HILLS THROUGH THE BODIE DISTRICT TO THE AREA OF THE AURORA DISTRICT. THIS UPWARP MAY CONTINUE TO THE NORTHEAST, SOUTH OF THE BOREALIS MINE.
AlterationPROGRESSIVE WEAK PROPYLITIC, STRONG PROPYLITIC, QUARTZ-ILLITE ALTERATION SURROUNDING SILICIFICATION IN THE MINERALIZED FAULTS.
Economic & production
Development statusProducer
First production1860
Discovery year1860
Identification
Deposit ID60001663
MRDS IDW002908
Alternate namesEsmeralda, Cambridge, Old Humboldt Mine Area, Humboldt West and Humboldt East Claims, Humboldt Vein, Prospectus Vein, Juniata Mine, Del Monte Mine, Wide West Mine, Johnson Mine, Pond Mine, Chihuahua Mine, Garibaldi Mine, Antelope Mine, Utah Mine, Silver Hill, Middle Hill, Last Chance Hill, Aurora Mine, Aurora Partnership Mine
RegionNA
Data scoreC
Coordinates38.28632, -118.90176
References
ROSS, D.C., 1961, GEOLOGY AND MINERAL DEPOSITS OF MINERAL COUNTY, NEVADA: NBMG BULL S8HILL, J.M., 1915, SOME MINING DISTRICTS IN NORTHEASTERN CALIFORNIA AND NORTHWESTERN NEVADA: USGS BULL 594FERGUSON, H.G., 1929, THE MINING DISTRICTS OF NEVADA: ECON GEOL, V. 24, NO. 2, P 115-48.GREEN, W.R., 1962, STRUCTURAL CONTROL OF MINERALIZATION AT THE AURORA MINING DISTRICT, MINERAL COUNTY, NEVADA: M.S. THESIS, UNIV. OF NEVADA.VANDERBURG, W.O., 1937, RECON. OF MINING DISTRICTS IN MINERAL COUNTY, NEVADA: U.S. BUREAU OF MINES INF. CIRC. 6941, 79P.KOSCHMANN, A.H. AND BERGANDAHL, M.H., 1968, PRINCIPAL GOLD-PRODUCING DISTRICTS OF THE U.S.: USGS PROF. PAPER 610, P.188.UNCOLN, F.C. 1923, MINING DIST. OF NEVADA: RENO, NEVADA NEWSLETTER PUB. CO. 137-8.STATE DIVISION OF MINE INSPECTION, DEC. 1983, DIRECTORY OF NEVADA MINE OPERATIONS ACTIVE DURING CALENDAR YEAR 1983.NBMG MINING DISTRICT FILES, FILE 189, PRESS CLIPPINGS.OSBORNE, M.A., 1991, EPITHERMAL MINERALIZATION AT AURORA, NEVADA: PROCEEDINGS OF THE GSN 1990 SYMPOSIUM, P. 1097-1110.NBMG, 1990, THE NEVADA MINERAL INDUSTRY 1990: NBMG SPECIAL PUBLICATION MI-1990, P. 23.NBMG, 1994, MI-1993NEVADA DIVISION OF MINERALS, 1994