Mine detail: Three Brothers Zone

Previously called ''

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Location

Lat / long:

47.51792, -121.3456

Resource(M)

Primary:	Copper, Molybdenum
Tertiary:	Silver, Arsenic, Gold, Lead
Ore:	Chalcopyrite, Galena, Hematite, Magnetite, Molybdenite, Pyrite, Pyrrhotite
Gangue:	Chlorite, Quartz, Siderite
Orebody form:	DISSEMINATED, STOCKWORK

Production

Operation type:	Unknown
Deposit type:	porphyry Cu
Production size:	Unknown
Development status:	Occurrence

Geology

Host rock:	Snoqualmie Batholith, Northern Phase;Snoqualmie Batholith, Northern Phase
Host type:	Tonalite
Structure:	Part Of Ne-Trending En-Echelon Belt Of Nw-Striking Faults, Fractures, And Breccia Pipes, Brecciation Of Host Rocks
Tectonic:	Cascade Volcanic Arc
Alteration processes:	Potassic, Propylitic, Silicification

References

MRDS	MP00031
MAS	530331236
DEP	10048444
Reference	{Deposit:: HOLLISTER, V.F., 1979, PROPHYRY COPPER-TYPE DEPOSITS OF THE CASCADE VOLCANIC ARC, WASHINGTON: MINERALS SCIENCE AND ENGINEERING, V. 11, P. 32.}{Deposit:: GUALTIERI, J.L., SIMMONS, G.C., THURBER, H.K., AND MILLER, M.S., 1973, MINERAL RESOURCES OF THE ALPINE LAKES STUDY AREA, CHELAN, KING, AND KITTITAS COUNTIES, WASHINGTON: U.S. GEOLOGICAL SURVEY OPEN-FILE REPORT 1918, P. 71-74.}{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. 109-110.}{Deposit:: GUALTIERI, J.L., THURBER, H.K., MILLER, M.S., MCMAHAN, A.B., AND FEDERSPIEL, F.F., 1975, MINERAL RESOURCES OF ADDITIONS TO THE ALPINE LAKES STUDY AREA, CHELAN, KING, AND KITTITAS COUNTIES, WASHINGTON: U.S. GEOLOGICAL SURVEY OPEN-FILE REPORT 75-3, P. 51-61.}{Deposit:: U.S. GEOLOGICAL SURVEY BULLETIN 1542-E, 1989, FIG. 11, P. 98; P. 101-102.}
Reporter	Peterson, Jocelyn A., Thurber, Causey, J. Douglas