The Mayesville District is a uranium mine located in Larimer county, Colorado at an elevation of 7,598 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: 7,598 Feet (2,316 Meters)
Commodity: Uranium
Lat, Long: 40.69389, -105.62917
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.
Mayesville District MRDS details
Site Name
Primary: Mayesville District
Commodity
Primary: Uranium
Tertiary: Bismuth
Tertiary: REE
Tertiary: Beryllium
Tertiary: Mica
Tertiary: Feldspar
Tertiary: Gold
Tertiary: Silver
Tertiary: Lead
Tertiary: Copper
Location
State: Colorado
County: Larimer
District: Mayesville 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
Not available
Production
Not available
Deposit
Record Type: District
Operation Category: Past Producer
Operation Type: Unknown
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, Sherman Batholith
Type: L
Description: Poudre River Shear Zone
Alterations
Alteration Type: L
Alteration Text: Fe Oxidation
Rocks
Name: Pegmatite
Role: Associated
Age Type: Associated Rock
Age Young: Neoproterozoic
Name: Pegmatite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Neoproterozoic
Name: Pegmatite
Role: Associated
Age Type: Host Rock
Age Young: Neoproterozoic
Analytical Data
Analytical Data: 0.043% U3O8, 0.1 TO 0.3 OZ/TON AG, TRACE TO 0.9 OZ/TON AU, TRACE PB, CU, BI, LA,
Materials
Ore: Pyrite
Ore: Galena
Ore: Muscovite
Ore: Beryl
Ore: Gold
Ore: Uranophane
Ore: Chalcopyrite
Gangue: Quartz
Gangue: Biotite
Gangue: Limonite
Comments
Comment (Deposit): INDIVIDUAL RECORDS PREPARED FOR FOLLOWING PROPERTIES: MIG MICA BERYL PROSPECT, CHANEY-SIMS BERYL PROSPECTS, CROWN POINT VEIN, LITTLE BOBBY VEIN, SODA SPRINGS GROUP, UNNAMED PROSPECT. ; INFO.SRC : 1 PUB LIT
Comment (Location): DISTRICT LIES SOUTH OF CACHE LA POUDRE RIVER IN RUGH RANCH AREA AND IS ACCESSIBLE BY HIGHWAY 14 UP POUDRE CANYON AND ROAD TO RUGH RANCH UP SHEEP CREEK, AND BY CROWN POINT ROAD UP BENNETT CREEK. DISTRICT INCLUDES PARTS OF SHEEP CREEK, SHEEP GULCH, CROWN POINT GULCH, AND MINERAL SPRINGS GULCH AND EXTENDS ONTO KINIKINIK QUAD. ELEV AND LAT-LONG GIVEN ARE FOR RUGH RANCH IN NE SEC. 01, T8N, R74W. ; INFO FROM LAND.ST :(1980)
Comment (Development): AREA HAS BEEN EXPLORED BUT APPARENTLY NO PAYABLE QUANTITIES OF BASE AND PRECIOUS METALS WERE DISCOVERED. ONLY SMALL AMOUNT OF U PRODUCED.
Comment (Deposit): DOMINANT TREND OF METAMORPHIC FOLIATION IS NE TO ENE WITH STEEP TO VERTICAL DIPS. BE-BEARING AND METALLIFEROUS PEGMATITES ALSO TREND NE. LACK OF VISIBLE SULFIDES OR PRIMARY U MINERALS SUGGESTS BASE METALS ARE MAINLY DISSEMINATED THROUGH FE-STAINED VEINS IN SHEAR ZONES OR WORKINGS ONLY PENETRATED UPPER OXIDIZED OR LEACHED ZONE. ZONE OF POSSIBLE SECONDARY ENRICHMENT MAY EXTEND TO AS DEEP AS 100 FT BELOW SURFACE. HIGHER GRADE ORE APPEARS TO BE LOCALIZED AT INTERSECTIONS OR AT POINTS OF DIVERGENCE OF BRANCH VEINS.
Comment (Workings): OPEN CUTS; MOSTLY SHORT ADITS AND SHALLOW SHAFTS.
References
Reference (Deposit): LOVERING, T.S., AND GODDARD, E.N., 1950, GEOLOGY AND ORE DEPOSITS OF THE FRONT RANGE, COLORADO: USGS PROF. PAPER 223, P. 286.
Reference (Deposit): PEARSON, R.C., AND OTHERS, 1981, MINERAL RESOURCES OF THE COMANCHE-BIG SOUTH, NEOTA-FLAT TOP, AND NEVER SUMMER WILDERNESS STUDY AREAS, NORTH-CENTRAL COLORADO: USGS OFR 81-578.
Reference (Deposit): NELSON-MOORE, J.L., AND OTHERS, 1978, RADIOACTIVE MINERAL OCCURRENCES OF COLORADO AND BIBLIOGRAPHY: CGS BULL. 40, P. 210.
Reference (Deposit): HANLEY, J.B., AND OTHERS, 1950, PEGMATITE INVESTIGATIONS IN COLORADO, WYOMING, AND UTAH, 1942-1944: USGS PROF. PAPER 227, P. 104.
Colorado Mining Photos
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