The Keystone is a copper, silver, and gold mine located in Yakima county, Washington at an elevation of 4,800 feet.
About the MRDS Data:
All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.
Mine Info
Elevation: 4,800 Feet (1,463 Meters)
Commodity: Copper, Silver, Gold
Lat, Long: 46.835, -121.28750
Map: View on Google Maps
Satelite View
MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.
Keystone MRDS details
Site Name
Primary: Keystone
Commodity
Primary: Copper
Primary: Silver
Primary: Gold
Tertiary: Tungsten
Tertiary: Lead
Location
State: Washington
County: Yakima
District: Bumping Lake District
Land Status
Land ownership: National Wilderness
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.
Administrative Organization: In William O. Douglas Wilderness In Snoqualmie National Forest
Holdings
Not available
Workings
Type: Surface/Underground
Ownership
Owner Name: Pemberton, William And Harlow, Sam
Home Office: Yakima, Wash.
Years: 1941 -
Production
Not available
Deposit
Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Discovery Year: 1913
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
General Physiographic Area: Pacific Mountain System
Physiographic Province: Cascade-Sierra Mountains
Physiographic Section: Northern Cascade Mountains
Mineral Deposit Model
Model Name: Polymetallic veins
Orebody
Form: VEIN
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: Granodiorite Locally Highly Fe-Oxide Stained
Rocks
Not available
Analytical Data
Analytical Data: 3.8, 4.43 OZ/TON WO3
Analytical Data: SAMPLE FROM STOCKPILE ASSAYED 0.2 OZ/TON AG, 0.16% CU, 0.36% AS, 0.01% WO3. 2 GRAB SAMPLES OF MILL CONCENTRATES ASSAYED 0.54, 2.8 OZ/TON AG
Analytical Data: TR, 0.06 OZ/TON AU
Materials
Ore: Wolframite
Ore: Chalcopyrite
Ore: Scheelite
Ore: Galena
Comments
Comment (Location): UNSURVEYED. ON WEST-FACING SLOPE OF NELSON RIDGE. 12 UNPATENTED CLAIMS. HUNTTING INDICATES APPROX. SEC. 15, T. 15 N., R. 12 E.; THIS LOOKS INCORRECT BASED ON LOCATION SHOWN IN SIMMONS AND OTHERS
Comment (Development): INACTIVE FOR MANY YEARS
Comment (Deposit): POSSIBLE POLYMETALLIC VEINS PERIPHERAL TO NEW FIND PORPHYRY COPPER DEPOSIT. MINERALIZATION IS IN FAULT CONTACT BETWEEN GRANODIORITE AND RHYODACITE
Comment (Workings): 2 CAVED ADITS, SEVERAL SURFACE CUTS
Comment (Geology): BUMPING LAKE PLUTON MAY BE PART OF OR CORRELATED WITH SNOQUALMIE BATHOLITH
References
Reference (Deposit): HUNTTING, M.T., 1956, INVENTORY OF WASHINGTON MINERALS - PART II, METALLIC MINERALS: WASHINGTON DIVISION OF MINES AND GEOLOGY BULLETIN 37, V. 1, P. 106.
Reference (Deposit): SIMMONS, G.C., VAN NOY, R.M., AND ZILKA, N.T., 1983, MINERAL RESOURCES OF THE COUGAR LAKES-MOUNT AIX STUDY AREA, YAKIMA AND LEWIS COUNTIES, WASHINGTON: U.S. GEOLOGICAL SURVEY BULLETIN 1504, P. 58-59.
Washington Gold
"Where to Find Gold in Washington" looks at the density of modern placer mining claims along with historical gold mining locations and mining district descriptions to determine areas of high gold discovery potential in Arizona. Read more: Where to Find Gold in Washington.
