Mine detail: Sunset Mine

Previously called ''

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Location

Lat / long: 47.85703, -121.46399

Resource(M)

Primary: Copper
Secondary: Silver, Gold
Tertiary: Molybdenum
Ore: Bornite, Chalcocite, Chalcopyrite, Copper, Covellite, Cuprite, Marcasite, Molybdenite, Pyrite, Silver
Gangue: Calcite, Chlorite, Kaolinite, Quartz, Serpentine, Talc
Orebody form: VEIN
Discovery year: 1897

Production

Operation type: Unknown
Production size: Small
Development status: Past Producer
Production years: 1902-1905, 1907, 1916-1930
First production started: 1902

Geology

Host rock:Index Batholith;Index Batholith
Host type:Tonalite
Associated type:Granite
Structure:Wnw-Trending Fracture Zone.
Tectonic:Accreted Terranes Overprinted By Cascade Volcanic Arc
Alteration processes:Weak Potassic, Sericitic, Chloritic

References

MRDSM060137
DEP10042375
Reference{Deposit:: TOEPFER, P.H., 1953, INVESTIGATION OF THE SUNSET COPPER MINE, SNOHOMISH COUNTY, WASHINGTON: U.S. BUREAU OF MINES REPORT OF INVESTIGATIONS 4989, 9 P.}{Deposit:: WEAVER, C.E., 1912, GEOLOGY AND ORE DEPOSITS OF THE INDEX MINING DISTRICT: WASHINGTON GEOLOGICAL SURVEY BULLETIN 7, P. 71-73.}{Deposit:: HUNTTING, M.T., 1956, MINERAL INVENTORY OF WASHINGTON - PART II, METALLIC MINERALS: WASHINGTON DIVISION OF MINES AND GEOLOGY BULLETIN 37, V. 1, P. 91.}{Deposit:: GRANT, A.R., 1969, CHEMICAL AND PHYSICAL CONTROLS FOR BASE METAL DEPOSITION IN THE CASCADE RANGE OF WASHINGTON: WASHINGTON DIVISION OF MINES AND GEOLOGY BULETIN 58, P. 78.}{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. 368.}{Deposit:: GRANT, A.R., 1976, REPORT OF EVALUATION, MINERAL RESOURCE ANALYSIS STUDY ON UNITED STATES FOREST SERVICE LAND, STATE OF WASHINGTON: PREPARED FOR U.S. FOREST SERVICE - REGION 6, CONTRACT NO. 004724N, P. 38-39.}{Deposit:: BROUGHTON, W.A., 1942, INVENTORY OF MINERAL PROPERTIES IN SNOHOMISH COUNTY, WASHINGTON: WASHINGTON DIVISION OF MINES AND GEOLOGY REPORT OF INVESTIGATIONS 6, P. 16.}{Deposit:: 1950 DIREXPL U.S. BUREAU OF MINES RPT INV. 4989}{Production:: TOEPFER, 1953, P. 4}{Reserve-Resource:: GRANT, 1976}
ReporterPuffett, Willard P., Peterson, Jocelyn A.