Last Chance Mine, Mount Tobin Mining District, Pershing County, Nevada, USAi

Regional Level Types
Last Chance Mine	Mine
Mount Tobin Mining District	Mining District
Pershing County	County
Nevada	State
USA	Country

Sec 35-36 T29N R39E
Structure: Fault, Fracture Sets (Ne)

Alteration: Local Silicification, Bleaching, Argillization Along Joints.

Deposit: Property was located and explored in 1938. Underground workings trend N 80 degrees W and consist of 225 feet of drifts & crosscuts which tap 2 small glory holes 130 x 40 x 30 ft. Deep and 20 x 20 x 40 feet deep. ; info.src : 1 pub lit; 2 unpub rept; 3 field observ films, veinlets of cinnabar in fractures & on bedding planes.; often accompanied by a little pyrite

Deposit type: Hot-spring Hg

Development: Acquired by h. W. Gould & co in 1940, and about 100 tons ore were mined, sorted and hauled and treated at the mt tobin furnace, but the grade was reportedly too low to justify continued mining. In 1942, the property was sold to w. L. Low who in 1943 recovered a small amount of hg by retorting sorted ore. He held the property until 1949 but reported no further production. In 1954, the ground was restaked As the rat hole claims by e. W. Simpson, virgil olson, and w. Polkinghorne. In the next few years, they explored the property by bulldozing, put down 2000 ft of shallow drill holes, and also produced a few flasks mg from ore treated in a 4-pipe retort. After 1958, no mining was done, and title was allowed to lapse in 1962. With rising mercury prices in 1965, the area was restaked by simpson As part of a group of 8 bluebird claims. Some mercury was recovered in 1967 and from time to time through 1971, though records of production during this period are inadequate. In 1971 it is reported that 75 tpd were being furnaced for the general mercury corporation of arizona; however, the furnace foundation seen on the property in 1980 would have accommodated a furnace of no more than 25 ton capacity and the burnt ore dump contains no more than 500 tons of calcines. Since jan, 1972 no mining has been attempted.

Geology: Cinnabar occurs As painty films and veinlets associated with small amounts of pyrite in fractures and bedding planes in pebbly shale & sandstone.

Rock formation(s): Koipato Group


Ore(s): Steep Fractures Striking N30E And Bedding Planes

Other Databases

Link to USGS MRDS:	10040470

Other Regions, Features and Areas containing this locality

References