Keystone

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

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.

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.