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

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

Sec 24 T38N R42E. Tactite
Deposit: The property was explored prior to 1955, but no mining was done until road had been built to it from the granite creek mine in 1955, when open-pit mining began. It consists of five unpatented claims. Workings include 2 short adits, trenches, and open cuts. 300-350 tons of 1.7% wo3 ore and 1000 to 1300 ton S of 0.5% wo3 ore were estimated to be present in 1946, As well As 6000 to 12,000 tons of 0.3% wo3 or less ore possible ; info.src : 1 pub lit; 2 unpub rept the deposit is on the west side of the south part of the granodiorite stock near the crest of the range. The contact zone between the stock and the sedimentary rocks is highly irregular. Slide rock covers much of the surface in the vicinity of the mine and exposures are poor. Small and discontinuous tactite bodies occur where the thin limestone beds, in argillite and hornfels, are truncated by the granodiorite stock or by irregular apophyses. The tactite bodies mined were from a Few feet to 25 feet wide and probably averaged about 20 ft. The tungsten content ranged from 0.1 % wo3 to 3.34 % but probably averaged about 0.5 % wo3. Workings extend along 1200 ft strike

Deposit type: W skarn

Development: 300-350 tons of 1.7% wo3 ore and 1000-1300 tons of 0.5% wo3 ore estimated present in 1946, As well As 6000 to 12,000 tons of 0.3% wo3 ore possible. In 1943, the property was owned by john etchert, jr., and w. M. Pettit, and leased to john h. Harden of winnemucca. Workings consisted of numerous trenches, open cuts and 2 Short adits, but access to the property was difficult. In 1955, the property was acquired by getchell mines and a road was constructed up granite creek from the granite creek mine, replac-ing the 2.5 to 3 miles of rough trail. Open-pit mining in 1955 and 1956 yielded 21300 tons of ore that were trucked to the getchell mill. 5 unpatented claims.

Geology: Main tactite body 2 to 10 ft. Wide and over 75 ft. Long along a very irregular contact. There are 4 tactite bodies

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


Ore(s): Tactite At Granodiorite/Limestone Contact

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Link to USGS MRDS:	10045083

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References