Commodities
PrimaryCopper, Molybdenum
SecondarySilver, Gold
TertiaryTungsten
Commodity typeM
Deposit
Deposit sizeS
Orebody formSTOCKWORK, DISSEMINATED IN BRECCIA BODIES
Ore controlFracture Zone
Materials
Ore mineralsBornite, Chalcopyrite, Gold, Malachite, Molybdenite, Pyrite, Pyrrhotite, Wolframite
GangueChlorite, Epidote, Kaolinite, Quartz, Sericite, Tourmaline
Geology
Host rockDiorite · Silver Star Pluton;Silver Star Pluton
Associated rockAndesite · Skamania Volcanics;Skamania Volcanics;Skamania Volcanics
StructureE-W Structures Are Mineralized. Breccia Is Cut By A Complex Series Of Post-Mineral Faults
Tectonic settingCascade Volcanic Arc
AlterationPotassic, Phyllic, Argillic, And Propylitic Outward From Center Of Deposit. Silicification Is Ubiquitous In Breccia Zone. Quartz-Sericite And Propylitic Zones Are Very Narrow
Economic & production
Development statusPast Producer
Discovery year1895
Identification
Deposit ID10047851
MRDS IDM700180
Alternate namesColumbia Gold and Copper Mine, Silver Star
RegionNA
Data scoreB
Coordinates45.77537, -122.19146
References
1952GRANT, A.R., 1969, CHEMICAL AND PHYSICAL CONTROLS FOR BASE METAL DEPOSITION IN THE CASCADE RANGE OF WASHINGTON: WASHINGTON DIVISION OF MINES AND GEOLOGY BULLETIN 58, P. 88-90.HUNTTING, M.T., 1956, INVENTORY OF WASHINGTON MINERALS - PART II, METALLIC MINERALS: WASHINGTON DIVISION OF MINES AND GEOLOGY BULLETIN 37, V. 1, P. 78.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.HOLLISTER, V.F., 1979, PORPHYRY COPPER-TYPE DEPOSITS OF THE CASCADE VOLCANIC ARC, WASHINGTON: MINERALS SCIENCE AND ENGINEERING, V. 11, P. 25-26.ASHLEY, R.P., AND PETERSON, J.A., 1991, FIELD EXAM WITH PLEXUS RESOURCES CORP.GRANT, A.R., 1976, REPORT OF EVALUATION, MINERAL RESOURCE ANALYSIS STUDY ON UNITED STATES FOREST SERVICE LAND, STATE OF WASHINGTON: UNPUB. REPORT PREPARED FOR U.S. FOREST SERVICE - REGION 6, CONTRACT NO. 004724N, P. 23.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.DERKEY, R.E., GULICK, C.W., AND LINGLEY, W.S., JR., 1993, WASHINGTON'S MINERAL INDUSTRY - 1992: WASHINGTON GEOLOGY, V. 21, NO. 1, P. 3-25.MOEN (1977)