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Mount Robinson deposit

Occurrence in Custer county in Colorado, United States with commodities Aluminum, Potassium
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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. Ore body information
  12. Economic information about the deposit and operations
  13. Mining district
  14. Land status
  15. Reserves and resources
  16. Links to other databases
  17. Bibliographic references
  18. Reporter information

Geologic information

Identification information

Deposit ID 10009279
MRDS ID D002158
Record type Deposit
Current site name Mount Robinson deposit

Geographic coordinates

Geographic coordinates: -105.345, 38.11389 (WGS84)
Elevation 2926
Relative position 6 MI. ESE OF SILVER CLIFF

Site location context

Political divisions (FIPS codes)

Custer(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Rosita(quadrangle 1:24,000 scale)

Canon City(quadrangle 1:100,000 scale)

Pueblo(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 Custer

Public Land Survey System information

Meridian Township Range Section Fraction State
6th Principal 022S 071W 20,29 Colorado

Comments on the location information

  • S CENTRAL PART OF ROSITA HILLS, ON MOUNT ROBINSON, ABOUT 1-1/4 MILE NNW OF ROSITA, IN THE SE/4 SEC 20, T 22 S, R 71 W.

Commodities

Commodity Importance
Aluminum Critical Primary
Potassium Primary

Comments on the commodity information

  • PROJECT 9350 - 01393 ALUNITE RESOURCES

Materials information

Materials Type of material
Diaspore Ore
Alunite Ore
Barite Gangue
Kaolinite Gangue
Quartz Gangue

Alteration

  • (Local) Silicification, Alunitization, Kaolinization. Alteration Of Rhyolite To Alunite By Solfataric Action

Analytical data

Result 2 ANALYSES ARE 6.5 % AND 24.0 % ALUNITe

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite
    Stratigraphic age (youngest) Pliocene
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite
    Rock unit name Rosita Hills Rhyolite
    Rock description Rosita Hills Rhyolite

Nearby scientific data

(1) -105.345, 38.11389
ListMap

Economic information

Ore body information

  • General form BROAD LENS (VOLCANIC CONDUIT)
    Thickness 60.96M
    Length 365.76M
    Width 304.8M

Economic information about the deposit and operations

Development status Occurrence
Commodity type Both
Deposit size Medium
Significant No
Discovery year 1890
Discoverer Whitman Cross, USGS

Mining district

District name Rosita Hills District

Land status

Ownership category Private

Reserves and resources

  • Type In-situ
    Estimate year 1943
    Commodity Subtype Grade units Group Importance Year
    Aluminum Alunite 15 wt-pct Aluminum Trace 1943

Comments on the reserve resource information

  • Estimated 1,200,000 tons alunite resource @ 6.5% alunite. (Thoenen, 1941)
  • GREATER PART OF RESERVE IS INFERRED

Comments on the workings information

  • NEARBY PITS, ADITS, MADE IN 1870'S FOR SILVER AND OTHER METALS, NOT FOR ALUNITE. SEVERAL TUNNELS AND SHAFTS WERE PLACED, THE SENECA TUNNEL BEING 600 FT. LONG ON THE EASTERN SLOPE OF THE HILL

Comments on development

  • ECON.COM: DEPOSIT IS LESS THAN 1 MI. FROM A ROAD, AND THERE IS LITTLE OVERBURDEN. ALUNITE IS CLOSELY LOCKED WITH QUARTZ.

Reference information

Bibliographic references

  • Analytical Data

    SRC.REF: THOENEN, J. R., 1941 , USBM R. I. 3561 , P. 13

  • Deposit

    CROSS, C. W., 1891 , ON ALUNITE AND DIASPORE FROM THE ROSITA HILLS, COLORADO: AM. JOUR. SCI., 3RD SER., V. 41 , NO. 246 , P. 466 - 475 .

  • Deposit

    CROSS, C. W., 1896 , GEOLOGY OF SILVER CLIFF AND THE ROSITA HILLS, COLORADO: USGS 17TH ANN. REPT., PT. 2 , P. 315 - 317 , 356 - 360 .

  • Deposit

    CROSS, C. W., 1912 , ALUNITE DEPOSITS OF ROSITA HILLS, COLORADO, USGS BULL. 511 , P. 38 - 41 .

  • Deposit

    GARDNER, L. S., 1943 , UNPUB. REPT. IN USGS FILE

  • Reserve-Resource

    THOENEN, J. R., 1941 , ALUNITE RESOURCES OF THE UNITED STATES: USBM REPT. INV. 3561 , P. 13 - 14 .

  • Deposit

    1878 DIREXPL UNKNOWN: PROSPECTING WORKS

  • Deposit

    1883 GEOLMAP W. CROSS: PUB. REPTS.

  • Deposit

    1940 RECON USBM: R. I. 3561

  • Deposit

    1942 RECON L. S. GARDNER: UNPUB. REPT.

  • Geology

    SHARP, W.N., 1978, GEOLOGIC MAP OF THE SILVER CLIFF AND ROSITA VOLCANIC CENTERS, CUSTER COUNTY, COLORADO: USGS MAP I-1081, 1:24,000.

Reporter information

Type Date Name Affiliation Comment
Reporter 1975-12-01 Hall, Robert B. U.S. Geological Survey
Updater 1978-08-01 Starritt, Bruce C. U.S. Geological Survey
Reporter 1983-11-17 Intermountain Field Operations Center (IFOC) U.S. Bureau of Mines
Reporter 1982-03-01 Collins, Donna B. Colorado Geological Survey
Updater 2006-04-05 Beach, Richard A. Colorado Geological Survey
Editor 2011-07-26 Wilson, Anna B U.S. Geological Survey changed record from site to deposit, fixed some typos.

Beyond USGS

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

External references

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.