Maggie No. 1 Claim, Potosi Mining District, Osgood Mountains, Humboldt County, Nevada, USAi

Regional Level Types
Maggie No. 1 Claim	Claim
Potosi Mining District	Mining District
Osgood Mountains	Mountain Range
Humboldt County	County
Nevada	State
USA	Country

Deposit: Massive white to clear quartz vein following a low-angle thrust fault that separates brown-weathering dolomite in the lower plate from medium gray limestone in the upper plate. The footwall just below the vein is highly contorted gray phyllite. There are numerous 0.5 cm wide veinlets of calcite in the upper plate limestone. Quartz vein material is commonly stained with iron oxide minerals.

Development: Very minor production, judging from small pile of tailings in wash. Workings appear to be from early to mid 1900's. No activity here in 1984, but a bulldozer is leveling an area in alluvium 0.5 km to the west, possibly for some sort of test heap leach pad for preble ore. Also there are recent drill holes 0.2-0.3 km west of the old workings (frag claims.)

Rock formation(s): Preble


Ore(s): Low Angle Thrust Fault


Alteration: Silicification

Deposit: Ne W discovery reported from the osgood range, silver lode claims (4) located by f. R. O'leary, jack s. Kirwin, located at S end of eden valley on western slope of osgood range. Property prospect in early 1940's, 60' winzes sunk from the of drift, drifting done along vein and 2 40' winzes sunk from ends of drifts, pods of scheelite encountered in vein material from winze. Dump material from early work shipped in 1940's, 20 oz Ag ; info.src : 1 pub lit; 2 unpub rept; 3 field observ; 5 pers comm massive white to clear quartz vein following a low-angle thrust fault that separates brown weathering dolomite in the lower plate from medium-gray limestone in the upper plate. The footwall just below the vein is highly contorted gray phyllite. There are numerous 0.5 cm wide veinlets of calcite in the upper plate limestone. Quartz vein material is commonly stained with iron oxide minerals. Discovery year: 1940's

Development: Prospected in early 1940's; dump material shipped in 1940's ran 20 oz./ton ag. Minor production, judging from small tailings pile in wash. No activity here in 1984, but a bulldozer is levelling an area of alluvium 0.5 km to the west, possibly for some S-ort of test heap leach pad for preble ore. Also, there are rec-ent drill holes 0.2-0.3 km west of the old workings (frag clai-ms).

Rock formation(s): Preble Formation


Ore(s): Low Angle Thrust Faults

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Link to USGS MRDS:	10043975

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References