The Moonlight is a silver and gold 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.
Moonlight MRDS details
Site Name
Primary: Moonlight
Secondary: Sunlight Mine
Commodity
Primary: Silver
Primary: Gold
Secondary: Copper
Secondary: Lead
Secondary: Phosphorus-Phosphates
Location
State: Montana
County: Granite
District: Princeton (South Boulder 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.
Holdings
Not available
Workings
Not available
Ownership
Owner Name: Robinson, William J.
Home Office: 2920 Floral Blvd., Butte, Mt.
Production
Year: 1945
Time Period: Post-1945
Description: Cp_Grade: ^32.1% P205 4.3% Moisture
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
Physiographic Detail: Flint Creek Range
Mineral Deposit Model
Not available
Orebody
Not available
Structure
Type: R
Description: Philipsburg Batholith
Type: L
Description: Douglas Mountain Anticline
Alterations
Not available
Rocks
Name: Phosphorite
Role: Host
Age Type: Host Rock Unit
Age Young: Late Permian
Name: Phosphorite
Role: Host
Age Type: Host Rock
Age Young: Late Permian
Analytical Data
Analytical Data: 32.67 % P OXIDE IN 5.2 FT BED. 23.88 % P OXIDE IN 11.2 FT BED.
Materials
Ore: Gold
Comments
Comment (Reserve-Resource): AVERAGE GRADE OF THE PHOSPHATE MEMBER IS ABOUT 23% 0VER A THICKNESS OF 11 FT. CONDITIONS ARE FAVORABLE FOR MINING THE ENTIRE MEMBER AND FOR BENEFICIATING THE MINE-RUN ORE TO A MARKETABLE PRODUCT.
Comment (Location): S SIDE OF PRINCETON GULCH. ; INFO FROM LAND.ST :(1971)
Comment (Production): AU-AG-CU-PB-ZN ORE WAS MINED EITHER IN EARLY 1900'S OR PRE-1900'S.
Comment (Deposit): WEAKLY MINERALIZED FAULT BREECIA WAS MINED FOR CU, PB, AG, AU. THE RETORT MEMBER IS ABOUT 12 FT THICK AND CONSISTS OF INTERBEDDED LAYERS OF PHOSPHORITE, PHOSPHATIC MUDSTONE, AND CALCAREOUS MUDSTONE. IT IS EXPOSED FOR A STRIKE LENGTH OF 150 FT UNDERGROUND, AND CAN BE TRACED ON THE SURFACE FOR A DISTANCE OF 5 MI N. THE MINING SECTION LIES BETWEEN A CHERTY HANGING WALL AND A MUDSTONE FOOTWALL.
Comment (Workings): SEVERAL ADITS DRIVEN IN A WEAKLY MINERALIZED ZONE. DRIFTS, CROSSCUTS AND RAISES WERE DRIVEN ON THE LOWER ADIT. TRENCHING WAS DONE IN 1962.
References
Reference (Deposit): MBMG SP 25, P. 7.
Reference (Deposit): MBMG BULL 58, P. 16.
Reference (Deposit): USFS MAP, DEER LODGE NATL. FOREST, 1953.
Reference (Deposit): MBMG BULL 100, P. 9.
Reference (Deposit): USBM RI 6611, P. 59, 63-4.
Reference (Production): USBM RI 6611, P. 65
Reference (Reserve-Resource): USBM R1 6611; P. 65.
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.
