The North Star Mine is a copper mine located in Jefferson county, Colorado at an elevation of 7,500 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: 7,500 Feet (2,286 Meters)
Commodity: Copper
Lat, Long: 39.86056, -105.29722
Map: View on Google Maps
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North Star Mine MRDS details
Site Name
Primary: North Star Mine
Commodity
Primary: Copper
Tertiary: Uranium
Tertiary: Zinc
Tertiary: Lead
Tertiary: Silver
Location
State: Colorado
County: Jefferson
District: Ralston Buttes District
Land Status
Land ownership: Private
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: Brumm, A. G.
Years: 1967 -
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Deposit Type: Vein
Operation Type: Unknown
Discovery Year: 1895
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
General Physiographic Area: Rocky Mountain System
Physiographic Province: Southern Rocky Mountains
Mineral Deposit Model
Not available
Orebody
Not available
Structure
Type: R
Description: Front Range Uplift, Denver Basin
Type: L
Description: Rogers Fault Zone
Alterations
Alteration Type: L
Alteration Text: Breccia Fragments Are Reported As Being Altered
Rocks
Name: Pegmatite
Role: Associated
Age Type: Host Rock Unit
Age Young: Neoproterozoic
Name: Pegmatite
Role: Associated
Age Type: Associated Rock
Age Young: Neoproterozoic
Name: Pegmatite
Role: Associated
Age Type: Host Rock
Age Young: Neoproterozoic
Name: Pegmatite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Neoproterozoic
Analytical Data
Analytical Data: ADAMS AND OTHERS' (1953) ANALYSES OF MINERALIZED BRECCIA FROM UNDERGROUND WORKINGS SHOWED 0.002 TO 0.850% U WITH ANOMALOUS CU OF 1.84 TO 5.74%. ALTHOUGH NO PB, ZN, OR AG MINERALS WERE OBSERVED, ANALYSES SHOWED 0.10% PB, 0.10 TO 0.38% ZN, AND TRACE TO 6.42 OZ/TON AG WITH ANOMALOUS VALUE OF 20.30 OZ/TON AG FROM DUMP SAMPLE.
Materials
Ore: Malachite
Ore: Bornite
Ore: Covellite
Ore: Uranophane
Ore: Chalcocite
Ore: Pitchblende
Comments
Comment (Location): 0.5 MILE NORTH OF RALSTON CREEK ; INFO FROM LAND.ST :(1975)
Comment (Commodity): OTHER SECONDARY BUT ILL-DEFINED U MINERAL TENTATIVELY CALLED HYDROPITCHBLENDE
Comment (Production): RECORD LISTED FIGURES AS CU BUT PROBABLY ARE TONS CU ORE
Comment (Development): MINE PRODUCED 4 TONS CU ORE IN 1894 AND 12 TONS IN 1916. URANIUM DISCOVERED BY USGS IN 1952
Comment (Deposit): DEPOSIT LIES IN NW-TRENDING SUBSIDIARY FRACTURES OF ROGERS FAULT SYSTEM IN MICROCLINE GNEISS COMPLEXLY INTERLAYERED WITH AMPHIBOLITE, HORNBLENDE GNEISS, BIOTITE GNEISS, AND PEGMATITE, ALL WITH NE STRIKE AND STEEP SE DIP. U AND CU MINERALS FOUND IN FRACTURE FILLINGS AND AS NONUNIFORMLY DISTRIBUTED CEMENTATION OF ALTERED BRECCIA FRAGMENTS.
Comment (Workings): SHORT UPPER LEVEL. LOWER ADIT DRIVEN GENERALLY N 20 E ABOUT 72 FT CONNECTING WITH 1894 STOPE THAT ONCE WAS OPEN TO SURFACE
Comment (Deposit): Discovery Year: 1890S
References
Reference (Deposit): NELSON-MOORE, J.L., COLLINS, D.B., AND HORNBAKER, A.L., 1978, RADIOACTIVE MINERAL OCCURRENCES OF COLORADO AND BIBLIOGRAPHY: COLORADO GEOLOGICAL SURVEY BULL. 40, P. 193-194
Reference (Deposit): SHERIDAN, DOUGLAS M. AND OTHERS, 1967, GEOLOGY AND URANIUM DEPOSITS OF THE RALSTON BUTTES DISTRICT JEFFERSON COUNTY, COLORADO: USGS PROF. PAPER 520.
Reference (Deposit): ADAMS, J.W., AND OTHERS, 1953, URANIUM OCCURRENCES IN THE GOLDEN GATE CANYON AND RALSTON CREEK AREAS, JEFFERSON COUNTY, COLORADO: USGS CIRC. 320
Reference (Production): ORIGINAL CRIB RECORD
Colorado Mining Photos
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