Arcturus Mine (Arcturus; NBMG Sample Site 2926), Trego Mining District, Pershing County, Nevada, USAi

Regional Level Types
Arcturus Mine (Arcturus; NBMG Sample Site 2926)	Mine
Trego Mining District	Mining District
Pershing County	County
Nevada	State
USA	Country

Commodity: 2926 was collected from the contact zone and the dump. The sample lamped well with good high grade tungsten and some powellite. The problem with this mine would be in developing sufficient ore reserves for although it appears to be high in grade, the tactite zone is very narrow.

Deposit: Narrow band of metasediments in contact with granodiorite. Metasediments have survived erosion in part because they have been silicified, forming a thin selvage of tactite. Scheelite-bearing tactite is exposed at the surface in a lens 50 ft long, 4-5 ft wide. The ore is coarse-grained and consists of garnet, epidote, quartz, and scheelite, with an average content of 1.0 % wo3. Surrounding the ore and continuing along strike for several hundred feet is barren tactite composed of garnet, hedenbergite, quartz, and calcite. The tactite is interbedded with calc-silicate hornfels, biotite schist, and metamorphosed volcanic rocks, all of which dip gently southeast into a large granite mass that constitutes most of the range. The contact between granite and metamorphic rocks is steep, and the ore-bearing tactite is probably cut off by granite about 200 ft down dip. At NE end of property, tactite occurs in a body 200 ft long, 20 ft wide, of garnet, diopside, and scheelite. Highest grade parts are 2-3 ft wide, containing 0.2-0.4 % wo3.

Deposit type: W skarn

Development: Appears to have been worked in about the 1950's. No activity at time of examination in 1985.

Ore(s): Contact Zone Of Metasediments With Granite

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Link to USGS MRDS:	10111471

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References