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  3. Mineral Resource Data System (MRDS)

Mayesville District

Past Producer in Larimer county in Colorado, United States with commodities Uranium, Gold, Silver, Lead, Copper, Beryllium, Mica, Feldspar, Bismuth, REE
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Alteration
  9. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Ore body information
  13. Controls for ore emplacement
  14. Economic information about the deposit and operations
  15. Mining district
  16. Land status
  17. Links to other databases
  18. Bibliographic references
  19. General comments
  20. Reporter information

Geologic information

Identification information

Deposit ID 10101853
MRDS ID D010395
Record type District
Current site name Mayesville District

Geographic coordinates

Geographic coordinates: -105.62977, 40.69387 (WGS84)
Elevation 2316
Relative position 20 TO 23 MILES N 13 TO 19 W FROM ESTES PARK

Site location context

Political divisions (FIPS codes)

Larimer(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Kinikinik(quadrangle 1:24,000 scale)

Fort Collins(quadrangle 1:100,000 scale)

Greeley(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Cache La Poudre(hydrologic unit)

South Platte(hydrologic accounting unit)

South Platte(hydrologic subregion)

Missouri(hydrologic region)

Federal lands

Arapaho and Roosevelt National Forests(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States Colorado Larimer

Public Land Survey System information

Meridian Township Range Section Fraction State
6th Principal 008N;008N 073W;074W 05,06,07,08;01,02 Colorado

Comments on the location information

  • 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)

Commodities

Commodity Importance
Uranium Primary
Gold Tertiary
Silver Tertiary
Lead Tertiary
Copper Tertiary
Beryllium Critical Tertiary
Mica Tertiary
Feldspar Tertiary
Bismuth Critical Tertiary
REE Critical Tertiary

Materials information

Materials Type of material
Beryl Ore
Chalcopyrite Ore
Galena Ore
Gold Ore
Muscovite Ore
Pyrite Ore
Uranophane Ore
Biotite Gangue
Limonite Gangue
Quartz Gangue

Alteration

  • (Local) Fe Oxidation

Analytical data

Result 0.043% U3O8, 0.1 TO 0.3 OZ/TON AG, TRACE TO 0.9 OZ/TON AU, TRACE PB, CU, BI, LA,

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Pegmatite
    Rock unit name Pegmatite
    Rock description Pegmatite
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
  • Host or associated Host
    Rock type Metamorphic Rock > Schist
  • Host or associated Host
    Rock type Metamorphic Rock > Gneiss
    Rock unit name Quartzofeldspathic Mica Schist And Gneiss And Hornblende Gneiss;Granitic Gneiss
    Rock description Quartzofeldspathic Mica Schist And Gneiss And Hornblende Gneiss;Granitic Gneiss

Nearby scientific data

(1) -105.62977, 40.69387
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Front Range Uplift, Sherman Batholith
Type of structure Local
Structure description Poudre River Shear Zone

Ore body information

  • Thickness 1.52M

Controls for ore emplacement

  • Ne-Trending Pegmatites; Intersections Or Divergences Of Branch Veins

Economic information about the deposit and operations

Development status Past Producer
Commodity type Both
Deposit size Small
Significant No

Mining district

District name Mayesville District

Land status

Ownership category National Forest

Comments on the workings information

  • OPEN CUTS; MOSTLY SHORT ADITS AND SHALLOW SHAFTS.

Comments on development

  • AREA HAS BEEN EXPLORED BUT APPARENTLY NO PAYABLE QUANTITIES OF BASE AND PRECIOUS METALS WERE DISCOVERED. ONLY SMALL AMOUNT OF U PRODUCED.

Reference information

Bibliographic references

General comments

Subject category Comment text
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.
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

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAR-83 Schwochow, Stephen D. Colorado Geological Survey
Editor 16-NOV-11 Wilson, Anna B U.S. Geological Survey Changed record type from site to district.

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Colorado resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.