Oro Cache Mine

The Oro Cache Mine is a gold mine located in Lemhi county, Idaho at an elevation of 8,501 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: Oro Cache Mine  

State:  Idaho

County:  Lemhi

Elevation: 8,501 Feet (2,591 Meters)

Primary Mineral: Gold

Lat, Long: 45.2836, -113.69190

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 Oro Cache Mine

Oro Cache Mine MRDS details

Site Name

Primary: Oro Cache Mine
Secondary: Ore Cash
Secondary: Freeman
Secondary: California
Secondary: Idaho Veins
Secondary: Marc Claims


Primary: Gold
Secondary: Lead
Secondary: Silver
Tertiary: Copper
Tertiary: Zinc


State: Idaho
County: Lemhi
District: Carmen Creek District

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.
Administrative Organization: Salmon National Forest


Type: Located Claim


Type: Underground


Not available


Not available


Record Type: Site
Operation Category: Past Producer
Operation Type: Underground
Year First Production: 1897
Year Last Production: 1912
Years of Production:
Significant: N
Deposit Size: S


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

Mineral Deposit Model

Not available




Type: R
Structure: Miner Lake Fault
Description: Miner Lake Fault


Alteration Type: L
Alteration: Oxidation


Name: Quartzite
Role: Host
Age Type: Host Rock Unit
Age Young: Neoproterozoic

Name: Quartzite
Role: Host
Age Type: Host Rock
Age Young: Neoproterozoic

Analytical Data

Analytical Data: GALENA ASSAYED 20 OZ AG/TON


Ore: Chalcopyrite
Ore: Sphalerite
Ore: Gold
Gangue: Quartz
Gangue: Pyrite
Gangue: Magnetite
Gangue: Limonite


Comment (Location): In Freeman Ck Cirque, 1 Mi Nne Of Freeman Peak. ; Info From Land.St :(1978)

Comment (Production): Primary Production From Or0 Cache Vein. Estimated Total Production: Over $100,000 In Au, Ag And Pb.

Comment (Development): Steam Powered 10-Stamp Mill, Equipped For Amalgamation And Concentration (1897-1914). Freeman Vein Was Originally Separate Operation.

Comment (Deposit): 4 Veins- California, Idaho, Oro Cache, Freeman. Oro Cache Was 4-6 Ft Wide, Deeply Oxidized Shear Zone. Others Were Qtz-Galena Veins, .5-5 Ft Wide. Idaho Vein Was Higest Grade, But Thin And Discontinuous.

Comment (Workings): 9 Adits, Lowest Adit Is 700 Ft Long. All Workings Inaccessible (1976)

Comment (Deposit): Quartzite Trends N20-55e, Steep W Dip ; Info.Src : 1 Pub Lit; 2 Unpub Rept

Comment (Geology): Original alteration entry: Local - Oxidation

Comment (Geology): Original ore control entry: Shear Zone, Subsidiary Fractures To Miner Lake Fault


Reference (Deposit): Mackenzie, W. O., 1949, Geology And Ore Deposits Of A Section Of The Beaverhead Range, East Of Salmon, Lemhi County, Idaho: Moscow, Idaho, Univ. Of Idaho, M. S. Thesis, 52 P.

Reference (Deposit): Umpleby, J.B., 1913, Geology and Ore Deposits Of Lemhi County, Idaho; USGS Bulletin528, P.125, 126

Reference (Deposit): Bell, Robert N., 1904, Report Of The Mining Districts Of Idaho For The Year 1903, P. 105.

Reference (Deposit): Peters, D. W., 1976, Divide Planning Unit- Salmon Nat For Rept

Reference (Deposit): Min Res Of Us, 1912-1915, For Years 1911-1914

Reference (Production): Peters, D. W., 1976, Divide Planning Unit- Salmon Nat For Rept

Reference (Deposit): Lipton, D. A., And Others, 1988, Mineral Resources Of The West Big Hole Study Area, Beaverhead County, Montana: U.S. Bureau Of Mines Open File Report MLA 16-88, Appendix B, No. 8, P. 102-105; Plate 1, No. 16.

Idaho Gold

Where to Find Gold in Idaho

"Where to Find Gold in Idaho" 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 Idaho. Read more at Where to Find Gold in Idaho.