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Pershing Mine

Past Producer in Saguache county in Colorado, United States with commodities Manganese, Silver, Gold, Copper, Zinc
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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. Ownership information
  18. Production statistics
  19. Workings at the site
  20. Links to other databases
  21. Bibliographic references
  22. General comments
  23. Reporter information

Geologic information

Identification information

Deposit ID 10012428
MRDS ID D008049
Record type Site
Current site name Pershing Mine
Alternate or previous names Pershing Manganese Mine
Related records 10118924

Geographic coordinates

Geographic coordinates: -106.10253, 38.24862 (WGS84)
Elevation 2932
Relative position 11.1 MILES N11E FROM SAGUACHE

Site location context

Political divisions (FIPS codes)

Saguache(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Graveyard Gulch(quadrangle 1:24,000 scale)

Saguache(quadrangle 1:100,000 scale)

Montrose(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

San Luis(hydrologic unit)

Rio Grande Headwaters(hydrologic accounting unit)

Rio Grande Headwaters(hydrologic subregion)

Rio Grande(hydrologic region)

Federal lands

Bureau of Land Management(Bureau of Land Management CO)

Bureau of Land Management CO BLM(Type of land area)

BLM(Federal land areas administered by BLM)

Geographic areas

Country State County
United States Colorado Saguache

Public Land Survey System information

Meridian Township Range Section Fraction State
New Mexico 046N 008E 08 SE OF SE OF SE Colorado

Comments on the location information

  • S-T-R, LAT-LONG, AND ELEV. TAKEN FROM BURBANK'S (1932) PLATE 1 (SCALE 1:12000). MINE OR CLAIM LIES AT HEAD OF MANGANESE GULCH 3.9 MILES SE OF BONANZA ; INFO FROM LAND.ST :(1976)

Commodities

Commodity Importance
Manganese Critical Primary
Silver Primary
Gold Primary
Copper Tertiary
Zinc Critical Tertiary

Materials information

Materials Type of material
Chalcopyrite Ore
Hausmannite Ore
Manganite Ore
Psilomelane Ore
Pyrite Ore
Pyrolusite Ore
Sphalerite Ore
Wad Ore
Limonite Gangue
Quartz Gangue

Alteration

  • (Local) Early Barren Stage Of Alteration By Fumarolic Or Acid-Hot Spring Activity Resulted In Intense Silicification, Wallrock Replacement By Jasper And Alteration Products Hematite, Diaspore, Alunite, Barite, Zunyite, Rutile, And Kaolin Minerals. Later Mineralizing Stage By Alkaline Or Neutral Solutions Deposited Ore And Gangue And Caused Micaceous Alteration (Sericite And Chlorite) And Calcite, Quartz, And Pyrite.

Analytical data

Result ON WEST BRANCH OF LOWER LEVEL, SIX SAMPLES FROM 1.9 TO 10 FT WIDE ASSAYED TRACE TO 0.7 OZ/TON AU, 0 TO 9.1 OZ/TON AG, 0 TO 10.45% MN.
Result ON EAST BRANCH OF LOWER LEVEL, NINE SAMPLES OVER WIDTHS OF 1 TO 5.2 FT ASSAYED 0.01 TO 0.37 OZ/TON AU, 1.0 TO 17.7 OZ/TON AG, 2.6 TO 32.9% MN.
Result ON UPPER LEVEL, TWO SAMPLES OVER WIDTHS OF 4 AND 9 FT ASSAYED 0.02 OZ/TON AU, 2.8 TO 7 OZ/TON AG, 19.6 TO 25.42% MN.
Result USBM ORE-DRESSING TESTS INCLUDED MINE ORE SAMPLE ASSAYING 25.8 % MN, 44.0 % INSOL, 38.9 % S102, 6.7 % FE, 0.7 % CAO, 2.3 % AL203, 0.5 % ZN, 0.03 % P.
Result DUMP SAMPLE ASSAYED 22.4 % MN, 44.4 % INSOL, 37.8 % S102, 9.2 % FE, 0.7 % CAO, 3.8 % AL203, 0.55 % ZN, 0.06 % P.
Result JIGGING AND TABLING TEST ON PLUS/MINUS 20-MESH CRUSHED MINE ORE GAVE MN DISTRIBUTION OF 53.5 % IN COMBINED JIG CONCENTRATE (34.2 WT % ASSAYING 41.0 % MN, 18.2 % INSOL, 7.4 % FE), 29.6 % IN COMBINED TABLE CONCENTRATE (17.3 WT % ASSAYING 44.8 % MN, 11.1 % INSOL, 7.7 % FE), 2.2 % IN COMBINED JIG TAILING (16.7 WT % ASSAYING 3.5 % MN, 86.1 % INSOL, 3.9 % FE), 6.4 % IN COMBINED TABLE TAILING (20.8 WT % ASSAYING 8.0 % MN, 74.9 % INSOL, 6.0 % FE), 8.3 % IN SLIME (11.0 WT % ASSAYING 19.8 % MN, 42.2 % INSOL, 12.4 % FE).
Result SINTER TEST ON COM

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite
    Stratigraphic age (youngest) Oligocene
    Stratigraphic age (youngest) Oligocene
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
    Rock unit name Rawley Andesite;Intrusive Rhyolite
    Rock description Rawley Andesite;Intrusive Rhyolite
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
    Rock unit name Rawley Andesite;Intrusive Rhyolite
    Rock description Rawley Andesite;Intrusive Rhyolite

Nearby scientific data

(1) -106.10253, 38.24862
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Sawatch Range, San Juan Volcanic Field, Rio Grande Rift
Type of structure Local
Structure description Bonanza Caldera, Bonanza Manganese Belt

Ore body information

  • General form TABULAR TO LENTICULAR
    Strike N80 TO 90W
    Dip NEARLY 90
    Thickness 7.62M
    Length 30.48M

Controls for ore emplacement

  • See Comments

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Year of last production 1959

Mining district

District name Bonanza (Kerber Creek) District

Land status

Ownership category BLM Administrative Area

Ownership information

  • Type Operator
    Owner L And M Mining Co.
    Home office Hillsboro, N.M.
    First year 1959

Production statistics

  • Year 1935
    Accuracy Accurate
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Manganese Manganese 32wt-pct
  • Year 1936
    Accuracy Accurate
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Manganese Manganese 40wt-pct

Comments on the production information

  • PARTIAL PRODUCTION RECORD. ORE IN 1935-36 SHIPPED TO CF&I STEEL CORP., PUEBLO

Workings at the site

  • Type of workings Underground
    Length 318.52M
    Overall length 137.16M
    Overall width 82.3M

Comments on the workings information

  • LOWER TUNNEL DRIVEN AT N12E FOR 414 FT. DRIFTS DRIVEN ON VEIN FOR 126 FT WEST AND 117 FT EAST. UPPER TUNNEL DRIVEN AT N5W FOR 153 FT. DRIFT DRIVEN ON VEIN FOR 180 FT. 20-FT WINZE CONNECTS UPPER TUNNEL WITH LOWER EAST BRANCH WORKINGS.

Comments on development

  • MINOR DEVELOPMENT DURING WORLD WAR 1 TO OBTAIN MN. OCCASIONAL PRODUCTION THRU 1950S.

Reference information

Bibliographic references

  • Deposit

    PATTON, H.B., 1916, GEOLOGY AND ORE DEPOSITS OF THE BONANZA DISTRICT, SAGUACHE COUNTY, COLORADO: COLORADO GEOLOGICAL SURVEY BULL. 9, 136 P.

  • Deposit

    BURBANK, W.S., 1932, GEOLOGY AND ORE DEPOSITS OF THE BONANZA MINING DISTRICT, COLORADO: USGS PROF. PAPER 169, 166 P.

  • Deposit

    WELLS, R.R., AND OTHERS, 1952, BENEFICIATION OF OXIDE MANGANESE ORES FROM ARAPAHOE, DOUGLAS, SAGUACHE, CUSTER, CHAFFEE, AND PARK COUNTIES, COLO.: USBM R1-4845, P. 6-9

  • Production

    COLO. DIV. MINES ANN. OPERATOR REPTS.

General comments

Subject category Comment text
Deposit SHATTERED RAWLEY ANDESITE IS INTRUDED BY RHYOLITE AND QUARTZ LATITE DIKES. FISSURED ZONE IS SERIES OF PARALLEL QUARTZ-PYROLUSITE VEINS. PYROLUSITE OCCURS IN MASSIVE FORM, AS SHEARED GROUPS OF PRISMS, AND AS STRIATED CRYSTALS, POSSIBLY A REPLACEMENT AFTER MANGANITE. ALTHO MOST OF THE OXIDES ARE INTIMATELY INTERGROWN WITH QUARTZ, SOME NARROW, PRACTICALLY CLEAN SHOOTS HAVE BEEN FOUND.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-NOV-1981 Schwochow, Stephen D. Colorado Geological Survey
Updater 01-AUG-1982 Schwochow, Stephen D. Colorado Geological Survey

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.