Manhattan mine, Highland Mining District, Highland Range, Lincoln County, Nevada, USAi

Regional Level Types
Manhattan mine	Mine
Highland Mining District	Mining District
Highland Range	Mountain Range
Lincoln County	County
Nevada	State
USA	Country

Sec 8 T1N R66E

Structure: Faulting Parallel To Contact

Alteration: Sericitization, Argillization, Bleaching, Argillization, Bleaching

Deposit: Skarn has resulted from intrusion of quartz monzonite, bleached and argillically altered on exposed surfaces. Much of the intrusive was later shattered and recemented with anhedral milky-grey quartz, probably during emplacement of quartz veins. The skarn has been hydrothermally altered to an Fe-mn gossan from poorly formed andradite and pyrite crystals. The gossan body is cut by massive white quartz veins which are prominent on the surface and traceable for hundreds of feet. The veins are generally vertical with easterly trend composed of randomly oriented quartz stringers. Other quartz veins strike n60e and dip steeply se. Some veins are up to 5 ft thick and are interspersed with hematite-stained jasper. Veins are composed of massive to subhedral quartz crystals. Malachite-stained quartz in float. Cockscomb quartz lines cavities. The veins carry crystals and massive clots of oxidized pyrite which are slightly magnetic,(intergrown pyrrmotite ?, magnetite?) and molybdenite/galena. Quartz veins are shattered almost to the point of brecciation. The skarn zone has an abundance of sericite intergrown with the oxidized andradite giving the appearance of a schist. Locally, faulting parallels contact between intrusive and quartz veins. Limonitic "jasper" was noted in float. The quartz veinlets have an abundance of open space, suggesting shallow depth of emplacement. Late-stage bluish white silica coats gossan. Few outcrops are exposed, with most slopes covered by plant growth and soil.

Development: Several stages of activity and exploration from 1860 to present. A 1903 press clipping states that an 8-ft ledge was opened on the 130-ft level, yielding ore running 120 oz/t Ag and 3-8 dollars/ au.

Geology: Ore body is an iron ore, elliptical in shape with axes 2700 & 3900 feet. Thick gossans have formed from the oxidation of pyritic garnet rock, which is andradite, occurring As large masses and thick irregular vein like bodies in a marble. Manhattan fissure 3-5 feet wide in the adit

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Link to USGS MRDS:	10037360

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References