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Manganese Hill Mine

Past Producer in Chaffee county in Colorado, United States with commodities Fluorine-Fluorite, Manganese
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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. Mineral occurrence model information
  10. Host and associated rocks
  11. Nearby scientific data
  12. Geologic structures
  13. Ore body information
  14. Controls for ore emplacement
  15. Economic information about the deposit and operations
  16. Mining district
  17. Land status
  18. Ownership information
  19. Reserves and resources
  20. Workings at the site
  21. Links to other databases
  22. Bibliographic references
  23. General comments
  24. Reporter information

Geologic information

Identification information

Deposit ID 10013772
MRDS ID D010246
Record type Site
Current site name Manganese Hill Mine
Alternate or previous names Morgan Ranch Deposits, Manganese, U.S. Fluorspar Co. Mine, Chaffee County Fluorspar Mine

Geographic coordinates

Geographic coordinates: -106.08032, 38.64667 (WGS84)
Elevation 2316
Location accuracy 10(meters)
Relative position 6.9 MILES S 03 W OF NATHROP

Site location context

Political divisions (FIPS codes)

Chaffee(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Nathrop(quadrangle 1:24,000 scale)

Gunnison(quadrangle 1:100,000 scale)

Montrose(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Arkansas Headwaters(hydrologic unit)

Upper Arkansas(hydrologic accounting unit)

Upper Arkansas(hydrologic subregion)

Arkansas-White-Red(hydrologic region)

Geographic areas

Country State County
United States Colorado Chaffee

Public Land Survey System information

Meridian Township Range Section Fraction State
New Mexico 051N 008E 28 NE OF SE OF NE Colorado

Comments on the location information

  • NE OF HECLA JUNCTION, EAST OF US HWY 285, WEST OF ARKANSAS RIVER; NE/4 SEC. 28, T 51 N, R 8 E, ABOUT 650 FT. NORTH OF CHIMNEY HILL MINE. INFO FROM LAND.ST :(1976)

Commodities

Commodity Importance
Fluorine-Fluorite Critical Primary
Manganese Critical Tertiary

Materials information

Materials Type of material
Fluorite Ore
Barite Gangue
Calcite Gangue
Goethite Gangue
Hematite Gangue
Kaolinite Gangue
Manganite Gangue
Montmorillonite Gangue
Opal Gangue
Psilomelane Gangue
Pyrite Gangue
Pyrolusite Gangue
Quartz Gangue

Alteration

  • (Local) Silicification, Fluoritization

Analytical data

Result LENSES TO 56% CAF2
Result AVERAGE FOR DEPOSIT 20% CAF2

Mineral occurrence model information

Model code 174
USGS model code 26b
Deposit model name Fluorspar deposits (fluorite veins)

Host and associated rocks

  • Host or associated Associated
    Rock type Metamorphic Rock > Gneiss
    Stratigraphic age (youngest) Neoproterozoic
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite
    Rock unit name Gneissic Quartz Monzonite;Ash-Flow Tuff
    Rock description Gneissic Quartz Monzonite;Ash-Flow Tuff
  • Host or associated Host
    Rock type Metamorphic Rock > Gneiss
    Rock unit name Banded Gneiss;Browns Canyon Formation
    Rock description Banded Gneiss;Browns Canyon Formation
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Mudstone > Claystone
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Siltstone
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Arkose
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Pyroclastic Rock > Tuff

Nearby scientific data

(1) -106.08032, 38.64667
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Southern Mosquito Range, Arkansas Valley Graben
Type of structure Local
Structure description Folds, Faults; N-Trending Fault Bounding Arkansas Valley

Ore body information

  • Strike N 70 E
    Dip 75-80N
    Thickness 30.48M
    Length 76.2M
    Width 3.66M

Controls for ore emplacement

  • Fault Breccia; Fault Zone Striking N 30-50 W, Dipping 65-85 Sw; Fractures

Comments on the geologic information

  • GEOL.DESC: VEINS UP TO 4 TO 5 FT. WIDE, STRIKE N 20E, IN GRANITE. (ARGALL)
  • GEOL.DESC: SOURCE: MESOTHERMAL SPRINGS. 3 TYPES FLUORSPAR OCCURANCES ARE COMMON: 1) LENSES OF BOTRYOIDAL & MASSIVE FLUORSPAR WITH LARGE VUGS, 2) WAVY RIBBON-LIKE LAYERED STRUCTURES OF FLUORSPAR ALONG OPEN FISSURES, 3) SMALL VEINLETS. TWO MAIN STRUCTURES: CHIMNEY HILL VEIN (N50W) AND BANCROFT #1 VEIN (N70E-NEARLY VERTICAL).

Economic information about the deposit and operations

Development status Past Producer
Commodity type Both
Deposit size Small
Significant No
Discovery year 1923
Year of first production 1936
Year of last production 1950

Mining district

District name Browns Canyon District

Land status

Ownership category Private

Ownership information

  • Type Owner
    Owner U.S. Fluorspar And Manganese, Inc.
    First year 1969

Comments on the production information

  • SEVERAL THOUSAND TONS OF FLUORSPAR PRODUCED FROM MANGANESE HILL AND CHIMNEY HILL MINES.

Reserves and resources

  • Type In-situ
    Estimate year 1953
    Commodity Subtype Grade units Group Importance Year
    Fluorine-Fluorite CaF2 20 wt-pct Fluorine Major 1953

Comments on the reserve resource information

  • Diamond drilling at the Chimney Hill and Manganese Hill area indicated more than 1 million tons of fluorspar material that contains about 20% CaF2. (Van Alstine)
  • THESE RESERVES/RESOURCES ARE IN COMBINATION WITH THE MANGANESE HILL MINE

Workings at the site

  • Type of workings Surface/Underground
    Area 0.079HA
    Length 85.34M
    Overall depth 7.62M
    Overall length 182.88M
    Overall width 45.72M

Comments on the workings information

  • SHAFTS, WINZES, INCLINES, ADITS, PITS, TRENCHES; MAJOR DEVELOPMENT IN 3 INCLINES DRIVEN EAST FROM SAME PORTAL AT ANGLES OF ABOUT 10 DEG, 20 DEG, 30 DEG

Comments on development

  • MILL WITH ABOUT 100 TPD CAPACITY OPERATING IN 1950

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit ORE OCCURS AS LENSES AND VEINLETS TO 6 IN THICK IN SHEETED ZONES

Reporter information

Type Date Name Affiliation Comment
Reporter 01-FEB-1983 Collins, Donna B. Colorado Geological Survey
Reporter 01-MAR-1973 Conservation Division Files U.S. Geological Survey
Updater 10-MAR-2006 Beach, Richard A. Colorado Geological Survey

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.