Independence mine, Pioche Mining District, Lincoln County, Nevada, USAi

Regional Level Types
Independence mine	Mine
Pioche Mining District	Mining District
Lincoln County	County
Nevada	State
USA	Country

Sec 5 T1N R67E
Structure: Highland Thrust Plate Fracturing

Alteration: Strong Hydrothermal Alteration; Chloritization.

Deposit: Ore is found in a 14-ft thick limestone bed in the pioche shale. Ore occurs As a bedded replacement deposit of iron-manganese in tabular bodies. Ore is very fine-grained, oxidized wad with circular pyrolusite crystals coating surfaces. Abundant Fe-mn oxides coat exposed surfaces. The orebody and host rocks are highly fractured and minute calcite veinlets cut the ore, which is slightly magnetic. Exposed in the trench are parallel shears trending n55e cutting a dark grey to reddish brown limestone unit which carries unoxidized, finely disseminated magnetite crystals with calcite/siderite filling abundant fractures. Sample 796 was taken from the main dump. North across the drainage, workings explore a diabase (?) body intruding the bedded carbonates. Outcropping at the entrance to an adit is coarse-grained, biotite-rich mafic intrusive containing grains of copper (malachite) and appearing hydrothermally altered. Veinlets resembling asbestos cut the intrusive. Chloritized limestone breccia outcropping near intrusive is cemented by sparry calcite/siderite and heavily Fe-mn-stained. Sample was taken of intrusive.

Deposit type: Replacement Mn

Development: Probably worked in 1930's. No activity at time of examination in 1983-only assessment work kept up to date. Owned by consolidated nevada-utah corp about 1913-1918; worked by independence mining co in 1890's.

Geology: Oxidized bedded replacement Mn ore

Rock formation(s): Pioche Shale;Lyndon Limestone


Ore(s): Bedding Planes

Other Databases

Link to USGS MRDS:	10037335

Other Regions, Features and Areas containing this locality

References