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

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

Sec 17 T38N R42E. Tactite
Structure: Folding

Deposit: Property was known As early As 1917; was acquired by getchell in 1942 and mined till summer, 1943. Mining resumed in 1952 and continued until 1953, by open-pit methods. Fayani and blaine held the claims in 1917, they were relocated later by kirby, and sold to getchell mine inc., in 1942. Workings consisted of 3 open pits in 1957, As well As short aidits and trenches. ; info.src : 1 pub lit; 2 unpub rept; 3 field observ kirby orebody is a tabular mass of tactite on contact of osgood granodiorite and preble limestone. Tactite body nearly parallels the hillslope, capped by a thin limestone layer. Outcrops are broad, but tactite is actually thin, less than 60 ft below surface. Limestone is complexly folded and tactite-pods are very irregular large masses of endoskarn formed in granodiorite, with some cu oxide staining. The deposit ends down-ward to the east against a lobe of granodiorite that cuts across the limestone beds. The haulage adit, 80 ft beneath the lowest outcrop, is entirely in granodiorite. Other bodies of scheelite-bearing tactite occur NE of the mine where the creek crosses the contact zone, but the tungsten content is only about -0.2 % wo3. Rock at the lower kirby pit (near creek) display swirls of biotite books near contact.

Deposit type: W skarn

Development: Acquired by getchell in 1942, mined 1942-43, 1952-1953. During the 1942-43 production period, getchell first mined the deposit by two glory holes from an adit 315 ft long. The glory holes were subsequently connected to form a single open pit from which ore was loaded by power shovel into trucks. Mining in 1952-3 was from open pits.

Geology: Major tactite orebodies localized by abrupt bends in granodiorite/limestone contact locally, abundant scheelite in quartz veins which cut tactite of ne. Pit. Large tactite orebodies were pendant like masses of replaced limestone protruding downward into granodiorite.

Rock formation(s): Osgood Mtns. Stock
Preble Formation;Preble Formation


Ore(s): Tactite At Contact Of Granodiorite With Sediment

Other Databases

Link to USGS MRDS:	10045081

Other Regions, Features and Areas containing this locality

References