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Twin Sisters Mountain Olivine Dep

The Twin Sisters Mountain Olivine Dep is a magnesite mine located in Whatcom county, Washington at an elevation of 5,499 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

Name: Twin Sisters Mountain Olivine Dep  

State:  Washington

County:  Whatcom

Elevation: 5,499 Feet (1,676 Meters)

Commodity: Magnesite

Lat, Long: 48.7083, -121.95830

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.

Satelite image of the Twin Sisters Mountain Olivine Dep

Twin Sisters Mountain Olivine Dep MRDS details

Site Name

Primary: Twin Sisters Mountain Olivine Dep
Secondary: Twin Sisters Mountain Olivine Dep.


Primary: Magnesite


State: Washington
County: Whatcom

Land Status

Land ownership: National Forest
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.


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Record Type: Site
Operation Category: Occurrence
Operation Type: Surface
Mining Method: Unknown
Years of Production:
Significant: N


General Physiographic Area: Pacific Mountain System
Physiographic Province: Cascade-Sierra Mountains
Physiographic Section: Northern Cascade Mountains

Mineral Deposit Model

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Analytical Data

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Comment (Location): DEPOSIT COVERS THE SE/4 T. 38 N., R. 6 E., THE E/2 T. 37 N., 6 E., THE W/2 T. 37 N., R. 7 E., THE NE/4 T. 36 N., R. 6 E., AND THE NW/4 T. 36 N., R. 7 E.


Reference (Deposit): P. 69.

Reference (Deposit): WA. DIV. MINES AND GEOL. BULLETIN 37, 1960, PART I, VOL. 1,

Washington Gold

Where to Find Gold in Washington

"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 at Where to Find Gold in Washington.