Keystone Quarry

The Keystone Quarry is a magnesite mine located in Stevens county, Washington at an elevation of 3,081 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 Quarry

Commodity

Primary: Magnesite

Location

State: Washington
County: Stevens

Land Status

Land ownership: Private
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.

Holdings

Type: Located Claim

Workings

Not available

Ownership

Owner Name: Harbison-Walker
Percent: 100.0
Home Office: Ohio
Info Year: 1983

Production

Year: 1954
Description: Crude Magnesite Mined 50000 Tonnes
Year: 1953
Description: Crude Magnesite Mined 50000 Tonnes
Year: 1952
Description: Crude Magnesite Mined 50000 Tonnes
Year: 1951
Description: Crude Magnesite Mined 50000 Tonnes
Year: 1950
Description: Crude Magnesite Mined 50000 Tonnes
Year: 1949
Description: Crude Magnesite Mined 50000 Tonnes
Year: 1948
Description: Crude Magnesite Mined 50000 Tonnes
Year: 1947
Description: Crude Magnesite Mined 50000 Tonnes
Year: 1946
Description: Crude Magnesite Mined 50000 Tonnes

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Surface-Underground
Mining Method: Unknown
Year First Production: 1946
Discovery Year: 1980
Years of Production:
Organization:
Significant: N

Physiography

General Physiographic Area: Rocky Mountain System
Physiographic Province: Northern Rocky Mountains

Mineral Deposit Model

Not available

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Unknown: Quartz
Unknown: Magnesite
Unknown: Dolomite
Unknown: Calcite

Comments

Comment (Reserve-Resource): A DEPOSIT REPORT WOULD ALSO INCLUDE RED MARBLE QUARRY AND TURK MAGNESITE DEPOSIT. RESOURCES INCLUDED IN # 0530650640 AND NOT DUPLICATED HERE.

Comment (Reserve-Resource): THE KEYSTONE DEPOSIT ORIGINALLY CONTAINED 450,000 MT OF HIGH GRADE MAGNESITE IN A TRIANGULAR BODY THAT WAS 150 M IN LENGTH, 75 M AT ITS BASE, AND WAS MINED TO A DEPTH OF 75 M. THESE RESERVES WERE DEPLETED BETWEEN 1946-1954. RESERVES ARE PRESENTLY EXHAUSTED

References

Reference (Deposit): JUNE 1983.

Reference (Deposit): MAS PROPERTY EVALUATION FILE REPORT, MAGNESITE, UNPUBLISHED

Reference (Deposit): MAGNESITE DEPOSITS, STEVENS COUNTY, WASHINGTON, BUMINES WFOC

Reference (Deposit): WETZEL, N., PROPOSED DEVELOPMENT OF THE STEVENS COUNTY

Reference (Deposit): 37, 1979, 113 PP.

Reference (Deposit): NON-METALLIC MINERALS, WASH. DIV. OF MINES AND GEOL., BULL

Reference (Deposit): VALENTINE, G.M., INVENTORY OF WASHINGTON MINERALS, PART 1

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.