Mayesville District

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

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.

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

Check out this collection of Colorado's best historic mining photos: Incredible Photos of Colorado Mining Scenes.