Mine detail: Pennsylvania Mine Project

Previously called 'Tom Johnston Property (in part)Alta Claims (in part)IndependenceJumbo Claim area?Pennsylvania Mine northPennsylvania Mine southCulverwell adit'

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Location

Lat / long:

37.41358, -114.47555

Resource(B)

Primary:	Gold, Silver, Copper
Tertiary:	Barium-Barite
Ore:	Chalcopyrite, Malachite, Azurite, Brochantite, Gold, Quartz, Pyrite, Calcite
Gangue:	Clay
Orebody form:	tabular

Production

Operation type:	Surface
Deposit type:	vein, fault/breccia zone; pluton-related
Production size:	Small
Development status:	Past Producer

Geology

Host rock:	Prospect Mountain Quartzite, Pioche Shale
Host type:	Sedimentary Rock,Diorite,Andesite
Associated type:	Diorite,Andesite,Porphyry,Tuff
Structure:	The Caliente caldera complex consists of an 80 km E-W by 35 km N-S area of nested calderas in this part of the southeastern Great Basin. It is bounded on its north and south sides by E-W shear zones that provided magmatic pathways for stratovolcanoes, volcanic domes, breccia pipes, and other volcanic vents. The E-W zones also provided fluid pathways that resulted in adjacent hydrothermal gold deposits of the Pennsylvania, and other mining districts. The E-W shear zones are interpreted as transverse zones, which are broad belts of accommodation that enabled crust north and south of them to extend at different rates, amounts, and methods., Rocks in the mine area are cut by both NE- and NW- striking faults.
Alteration processes:	Argillization and silicification are the dominant alteration types in the mine area. Host rocks in the mine area are thoroughly kaolinized and silicified. Chloritically altered intrusive outcrops nearby.

References

MRDS	M241647
DEP	10310471
Reference	{Deposit:: Bentz, J. and Smith, P., 1983, Field examination report on Sept 13,1983.}{Deposit:: Tschanz and Pampeyan, 1970, NBMG Bull 73, p. 170-172, Pl. I., Ii.}{Deposit:: NBMG District Files, Report on Tom Johnson property}{Deposit:: Grapevine Spring G-E-M Resources Area Technical Report, 1983, for BLM.}{Deposit:: Snee, Lawrence W. and Rowley, Peter D. , 2000, New 40Ar/39Ar dates from the Caliente caldera complex, Nevada-Utah; at least 10 million years of Tertiary volcanism in one of the worl * largest caldera complexes; Abstracts with Programs - Geological Society of America, vol.32, no.7, pp.461.}{Deposit:: NBMG MI-1996}{Deposit:: Denver Mining Record, 8/28/96.}{Deposit:: Denver Mining Record, 1/29/97.}
Reporter	Schruben, Paul G., LaPointe, D.D.