Ogee Mine, Potosi Mining District, Osgood Mountains, Humboldt County, Nevada, USAi

Regional Level Types
Ogee Mine	Mine
Potosi Mining District	Mining District
Osgood Mountains	Mountain Range
Humboldt County	County
Nevada	State
USA	Country

Sec 32 T38N R42E. Low grade gold mine.




Deposit: A 1984 report describes the deposit: the pinson "A" zone is 1000 ft long by 60 ft thick containing 1500000 tons of ore averaging 0.18 oz/t au, covered by 10-50 ft of alluvium. Further drilling indicated 1700000 tons averaging 0.15 oz/t Au plus an additional tonnage of low-grade in the B zone in the vicinity of the old pit. A major ne-striking fault zone 50-70 ft wide, dipping 40-50 SE controls gold mineralization. It has been traced by drilling for 8000 ft. The "A" orebody is localized by this shear zone where it coincides with the contact between the preble and comus formations. It consists of fine disseminations in jasperoid. Original claims staked by clovis pinson in 1945, held in family through 1979. Mined in 1949 by open pit methods. The pinson deposti was discovered on leased claims in 1971 by livermore and galli. (cordex). The pinson was to be put in production in 1980 the project consisting of an open pit mine, and conventional gold mill which will process approx. 300,000 tons ore per year. Present (1979) known reserves of medium grade ore are sufficent for five years' operations, with additional reserves of low-grade to extend mine life to 10 yr or more in 1980, work was being done on a head. Leach operation which would recover gold from 3,000, 000 tons ore to a low-grade for milling. Listed As an active open pit mine and cyanidization plant in 1980, employing about 80 persons. ; info.src : 1 pub lit; 2 unpub rept; 3 field observ

Deposit type: Carbonate-hosted Au-Ag

Development: Ne W pinson deposit descovered in 1971 by livermore and galli. Known reserves (1979)=1.5 million tons plus more lowgrade or. Owned and operated in 1981 by cordilleran exploration (cordex). Listed As an active open pit mine and mill with cyanidation operation in 1983, employing a total of 130 persons.. Owned and operated in 1981 by cordilleran exploration (cordex). Listed As an active open pit mine and mill with cyanidation operation in 1983, employing a total of 130 persons.

Geology: Geol.com: irregular zones of low-grade gold ore along bedding planes and minor fractures in argillite in footwalk . A conspicuous contact metamorphic aureole surrounds the granodiorite stock, extending irregularly up to 10000 ft out from the margins of the intrusive. A number of tungsten-bearing tactite deposits rim the granodiorite, forming wherever a calcareous bed was present within the contact zone. The pinson mine also lies within this contact aureole, with granodiorite outcropping 1200 ft N of the mine. A conspicuous contact metamorphic aureole surrounds the granodiorite stock, extending irregularly up to 10000 ft out from the margins of the intrusive. A number of tungsten-bearing tactite deposits rim the granodiorite, forming wherever a calcareous bed was present within the contact zone. The pinson mine also lies within this contact aureole, with granodiorite outcropping 1200 ft N of the mine.

Rock formation(s): Osgood Mtns. Stock
Comus Formation


Ore(s): Fault Zone (Maybe S. Extension Of Getchell Fault)

Other Databases

Link to USGS MRDS:	10045085
Link to USGS MRDS:	10159501
Link to USGS MRDS:	10044956

Other Regions, Features and Areas containing this locality

References