The Demos Group is a tungsten and silver mine located in Madison county, Montana 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
Elevation: 8,501 Feet (2,591 Meters)
Commodity: Tungsten, Silver
Lat, Long: 45.57556, -111.97500
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.
Demos Group MRDS details
Site Name
Primary: Demos Group
Secondary: Margie
Secondary: Roger
Secondary: Lucky Joe
Secondary: Rockefeller
Secondary: Independent
Commodity
Primary: Tungsten
Primary: Silver
Tertiary: Antimony
Tertiary: Iron
Tertiary: Manganese
Tertiary: Copper
Tertiary: Lead
Location
State: Montana
County: Madison
District: Potosi District
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Owner Name: H. Demos
Home Office: Butte, Mt.
Years: 1958 -
Owner Name: Rotosi Tungsten Mining Co.
Production
Not available
Deposit
Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Discovery Year: 1906
Discovery Method: Unknown
Years of Production:
Organization:
Significant: N
Physiography
General Physiographic Area: Rocky Mountain System
Physiographic Province: Northern Rocky Mountains
Physiographic Detail: Tobacco Root Mountains
Mineral Deposit Model
Not available
Orebody
Form: LENSES
Structure
Type: L
Description: Nw Bismark Fault
Alterations
Not available
Rocks
Name: Quartz Monzonite
Role: Host
Age Type: Host Rock
Age Young: Late Cretaceous
Name: Quartz Monzonite
Role: Host
Age Type: Associated Rock Unit
Age Young: Late Cretaceous
Analytical Data
Analytical Data: ASSAYS MADE
Materials
Ore: Tetrahedrite
Ore: Anglesite
Ore: Cerargyrite
Ore: Huebnerite
Gangue: Pyrite
Gangue: Chalcopyrite
Gangue: Fluorite
Comments
Comment (Deposit): 5 PATENTED CLAIMS-MARGIE, ROGERS, LUCKY JOE, ROCKEFELLER, INDEPENDENT ; INFO.SRC : 1 PUB LIT
Comment (Location): LOCATED NORTH OF SOUTH WILLOW CREEK BETWEEN POTOSI AND MINE PEAKS.
Comment (Workings): CLAIMS CONTAIN SHAFTS, ADITS AND NUMEROUS PITS
Comment (Geology): GEOL.DESC: VEINS STK. N 60-70 E, DIP 80 NW.
References
Reference (Deposit): EYDE, TH, 1958, POTOSI TUNGSTEN DIST, MADISON CO, MONT, MONT. BUREAU OF MINES & GEOL. INF. CIR. 21, P. 39
Reference (Deposit): TANSLEY, HART, 1933, GEOL RECON. OF THE TABACCO ROOT MTNS, MADISON, CO, MONT, MONT. B. MINES AND GEOL. MEM. 9, P. 32
Reference (Deposit): CONSV. COMPL. DATE, 12-09-1971
Reference (Deposit): 1906 DIREXPL SEN. CLARK-INT. OF BUTTE HIRED MINING EXAMINER
Reference (Deposit): 1937 DIREXPL J. NORTON-METALLURGICAL AND MINING ENGINEER, BUTTE
Reference (Deposit): FOREST SURUSY ASSAYS (FSROI-00128)-(FSROI-00131)
Reference (Deposit): 1958 COMPILE M.BMG. INF CIRC. 21
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.
