Commodities
PrimarySilver, Gold
SecondaryManganese
TertiaryCopper, Lead
Deposit
Deposit typeSEDIMENT-HOSTED, volcanic-hosted, DISSEMINATED
Model173: Sediment-hosted Au
Deposit sizeS
Orebody formTABULAR
Ore controlGold mineralization is erratically distributed throughout the jasperoid and is locally present in the volcanics, including a 30-foot zone averaging 0.036 ounces of gold per ton in one drill hole.
Materials
Ore mineralsGold, Galena, Psilomelane, Pyrolusite, Wad
GangueQuartz, Pyrite
Geology
Host rockLimestone,Siltstone,Volcanic Rock (Aphanitic) · Augusta Mountain Formation
StructureThin, discontinuous veneers and lenses of gold-bearing jasperoid are exposed along a north-south volcanic/limestone contact for a strike length of 12,000 feet.
AlterationVolcanic rocks are locally silicified along the volcanic/limestone contact and jasperoid has formed along the volcanic/limestone contact for a strike length of more than two miles.
Economic & production
Development statusProspect
Discovery year1994
Identification
Deposit ID10310507
RegionNA
Data scoreB
Coordinates39.66691, -117.45894
References
Stewart and others, 1977The Denver Mining Record, 11/30/94NBMG MI-95Quest International, 1997The Northern Miner, 9/15/97.Long, K.R., DeYoung, J.H., Jr., and Ludington, S.D., 1998, Significant deposits of gold, silver, copper, lead, and zinc in the United States: U.S. Geological Survey Open-File Report 90-206A, 33 p.; 98-206B. one 3.5 inch diskette.