The Yama Group is a silver and lead mine located in Jefferson county, Montana.
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.
Yama Group MRDS details
Site Name
Primary: Yama Group
Commodity
Primary: Silver
Primary: Lead
Secondary: Gold
Secondary: Zinc
Location
State: Montana
County: Jefferson
District: Clancy-Lump Gulch 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.
Holdings
Not available
Workings
Not available
Ownership
Owner Name: Frank Yama
Home Office: Clancy, Mt.
Production
Year: 1921
Description: Ap_Grade: ^8% Pb, 8% Zn
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
General Physiographic Area: Rocky Mountain System
Physiographic Province: Northern Rocky Mountains
Mineral Deposit Model
Not available
Orebody
Not available
Structure
Type: R
Description: Boulder Batholith
Alterations
Not available
Rocks
Name: Quartz Monzonite
Role: Associated
Age Type: Associated Rock
Age Young: Late Cretaceous
Name: Quartz Monzonite
Role: Associated
Age Type: Host Rock
Age Young: Late Cretaceous
Name: Quartz Monzonite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Late Cretaceous
Analytical Data
Analytical Data: 8% PB & 8% ZN
Materials
Ore: Sphalerite
Ore: Gold
Ore: Galena
Gangue: Quartz
Comments
Comment (Production): HEAVY PENALTIES FOR CONTAINED ZINC DISCOURAGED FURTHER PRODUCTION.
Comment (Development): 4 PATENTED CLAIMS
Comment (Location): N SLOPE OF LUMP GULCH. ; INFO FROM LAND.ST :(1950)
Comment (Workings): 3 ADITS RANGING IN LENGTH FROM 90-500 FT.
References
Reference (Deposit): MBMG BULL 16, P. 43-4.
Reference (Deposit): USGS PP 428, PL. 1.
Principal Gold Districts of Montana
In Montana, 54 mining districts have each have produced more than 10,000 ounces of gold. The largest producers are Butte, Helena, Marysville, and Virginia City, each having produced more than one million ounces. Twenty seven other districts are each credited with between 100,000 and one million ounces of gold production. Read more: Principal Gold Districts of Montana.
