Commodities
PrimaryCopper, Silver, Gold
TertiaryMolybdenum, Zinc, Lead
Commodity typeM
Deposit
Deposit sizeN
WorkingsUnderground
Orebody formBRECCIA ZONE
Ore controlFault Zone
Materials
Ore mineralsBornite, Chalcocite, Chalcopyrite, Galena, Magnetite, Molybdenite, Pyrite, Sphalerite
GangueCalcite, Quartz, Sericite, Tourmaline
Geology
Host rockDiorite · Silver Star Pluton, Quartz Diorite Porphyry Phase
StructureBreccia Pipe
Tectonic settingCascade Volcanic Arc
AlterationPotassic, 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
Economic & production
Development statusOccurrence
Discovery year1897
Identification
Deposit ID10047832
MRDS IDM700156
Alternate namesSilver Star
RegionNA
Data scoreC
Coordinates45.77203, -122.2009
References
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.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.ASHLEY, R.P., AND PETERSON, J.A., 1991, FIELD EXAM WITH PLEXUS RESOURCES CORP.PLEXUS RESOURCES CORP., 1990, ANNUAL REPORTPHILLIPS, 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.DERKEY, R.E., AND GULICK, C.W., 1992, WASHINGTON'S MINERAL INDUSTRY - 1991: WASHINGTON GEOLOGY, V. 20, NO. 1, P. 3-25.