The Gem Mine is a silver and manganese mine located in Granite 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.
Gem Mine MRDS details
Site Name
Primary: Gem Mine
Secondary: Part of Trout Group
Commodity
Primary: Silver
Primary: Manganese
Secondary: Copper
Secondary: Lead
Secondary: Zinc
Tertiary: Arsenic
Tertiary: Antimony
Location
State: Montana
County: Granite
District: Philipsburg (Granite-Flint Creek) District
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Owner Name: Western Ore And Mining Co.
Production
Year: 1962
Time Period: 1860-1962
Mined: 551155.500 mt
Material type: ore
Deposit
Record Type: Site
Operation Category: Past Producer
Deposit Type: Polymetallic Replacement
Operation Type: Unknown
Discovery Method: Unknown
Years of Production:
Organization:
Significant: Y
Deposit Size: S
Physiography
General Physiographic Area: Rocky Mountain System
Physiographic Province: Northern Rocky Mountains
Physiographic Detail: Flint Creek Range
Mineral Deposit Model
Not available
Orebody
Form: TABULAR
Structure
Type: R
Description: Philipsburg Batholith
Type: L
Description: Philipsburg Anticline, Philipsburg Overthrust
Alterations
Alteration Type: L
Alteration Text: Oxidized
Rocks
Name: Diorite
Role: Associated
Age Type: Associated Rock
Age Young: Late Cretaceous
Name: Diorite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Late Cretaceous
Name: Diorite
Role: Associated
Age Type: Host Rock
Age Young: Late Cambrian
Analytical Data
Analytical Data: 40% MN, 18% SI, VERY LITTE FE AND P.
Materials
Ore: Proustite
Ore: Galena
Ore: Tetrahedrite
Ore: Psilomelane
Ore: Pyrolusite
Ore: Sphalerite
Gangue: Calcite
Gangue: Rhodochrosite
Gangue: Quartz
Gangue: Dolomite
Comments
Comment (Other Database): RECORD NUMBER 242 IS A POTENTIAL DUPLICATE OF THIS RECORD
Comment (Location): SIDE LINES THE TROUT CLAIM ON THE S SIDE.; PREVIOUS QUAD DESIGNATION = LETHBRIDGE 1:250000
Comment (Production): $10,000 AG (1906) USGS BULL 725, P. 163.
Comment (Development): UNTIL 1908 A PRODUCER OF AG, 1917 REOPENED FOR MN.
Comment (Deposit): ORE AND DEPOSITS RESEMBLE TROUT CLAIM BUT VEIN MUCH NARROWER. 2 IRREGULAR BODIES, ONE AJOINS THE GEM VEIN AND THE OTHER LIES ON THE NORTH OR FOOTWALL SIDE AND EXTENDS INTO THE TROUT CLAIM. BOTH PITCH STEEPLY NE, PARALLEL WITH THE DIP OF THE LIMESTONE.
Comment (Workings): SEVERAL SHALLOW SHAFTS AND PITS.
Comment (Geology): HASMARK IS MOST FAVORABLE HOST FOR MANGANESE DEPOSITS. TABULAR MANGANESE BODIES MINED FROM SILVER HILL FM. BY WEST ALGONQUIN ARE AS MUCH AS 50 M ALONG STRIKE AND 15 M THICK
Comment (Workings): MINE DEVELOPED BY A DEEP TWO-COMPARTMENT SHAFT NEAR FROST CREEK, AN OPEN CUT, AND SEVERAL TUNNELS TO THE WEST CALLED THE WEST ALGONQUIN MINE. FROM ABOUT 1929 TO 1960 THE TROUT AND ALGONQUIN WERE OPERATED TOGETHER. PRODUCTION FROM THE ALGONQUIN VEIN IS INCLUDED IN THE PRODUCTION CREDITED TO THE TROUT MINE. SILVER MILL ON PROPERTY 1881-2. MN ORE MINED THROUGH A PIT 30-50 FT WIDE, 150 FT LONG AND AT LEAST 60 FT IN PITCH LENGTH
Comment (Deposit): Mergered data from:Deposit ID 10102039 (Little Gem) Deposit ID 10101985 (Pocahontas) Deposit ID 10270424 (Algonquin) Deposit ID 10245558 (Trout)
References
Reference (Deposit): USGS PP 78, P. 210.
Reference (Deposit): USGS BULL 1237, P. 31-57, PLATES.
Reference (Deposit): USGS BULL 922-G P.
Reference (Production): USGS PP 78.
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.
