Mine detail: Black Jack Prospect

Previously called 'Silver Star'

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Location

Lat / long:

45.77203, -122.2009

Resource(M)

Primary:	Copper, Silver, Gold
Tertiary:	Molybdenum, Zinc, Lead
Ore:	Bornite, Chalcocite, Chalcopyrite, Galena, Magnetite, Molybdenite, Pyrite, Sphalerite
Gangue:	Calcite, Quartz, Sericite, Tourmaline
Orebody form:	BRECCIA ZONE
Discovery year:	1897

Production

Operation type:	Unknown
Production size:	None
Development status:	Occurrence

Geology

Host rock:	Silver Star Pluton, Quartz Diorite Porphyry Phase
Host type:	Diorite
Structure:	Breccia Pipe
Tectonic:	Cascade Volcanic Arc
Alteration processes:	Potassic, Phyllic, Silicified Material Peripheral To Breccia. Finely Brecciated Material In Fracture Zone Has Been Altered (Tourmalinized, Silicified) But Away From Breccia, Rock Is Not Altered

References

MRDS	M700156
DEP	10047832
Reference	{Deposit:: MOEN, W.S., 1977, ST. HELENS AND WASHOUGAL MINING DISTRICTS OF THE SOUTHERN CASCADES OF WASHINGTON: WASHINGTON DIVISION OF GEOLOGY AND EARTH RESOURCES INFORMATION CIRCULAR 60, P. 43, 46-48.}{Deposit:: DERKEY, R.E., JOSEPH, N.L., AND LASMANIS, RAYMOND, 1990, METAL MINES OF WASHINGTON - PRELIMINARY REPORT: WASHINGTON DIVISION OF GEOLOGY AND EARTH RESOURCES OPEN-FILE REPORT 90-18, P. 336.}{Deposit:: ASHLEY, R.P., AND PETERSON, J.A., 1991, FIELD EXAM WITH PLEXUS RESOURCES CORP.}{Deposit:: PLEXUS RESOURCES CORP., 1990, ANNUAL REPORT}{Deposit:: PHILLIPS, W.M., 1987, GEOLOGIC MAP OF THE VANCOUVER QUADRANGLE, WASHINGTON AND OREGON: WASHINGTON DIVISION OF GEOLOGY AND EARTH RESOURCES OPEN-FILE REPORT 87-10, SCALE 1:100,000.}{Deposit:: DERKEY, R.E., AND GULICK, C.W., 1992, WASHINGTO * MINERAL INDUSTRY - 1991: WASHINGTON GEOLOGY, V. 20, NO. 1, P. 3-25.}
Reporter	Caress, Mary E. (Evarts, Russ), Peterson, Jocelyn A.