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Cocomongo Mine

Past Producer in Saguache county in Colorado, United States with commodities Lead, Copper, Silver, Zinc, Gold, Manganese, Titanium, Metal
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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. Links to other databases
  19. Bibliographic references
  20. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10012960
MRDS ID D008996
Record type Site
Current site name Cocomongo Mine
Related records 10215739

Geographic coordinates

Geographic coordinates: -106.15143, 38.31362 (WGS84)
Elevation 2978
Relative position 15.5 MILES N02W FROM SAGUACHE

Site location context

Political divisions (FIPS codes)

Saguache(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Bonanza(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

Rio Grande National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States Colorado Saguache

Public Land Survey System information

Meridian Township Range Section Fraction State
New Mexico 047N 007E 24 SW OF SE OF NW 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 ALONG KERBER CR. ABOVE CONFLUENCE WITH SQUIRREL CR. AND JUST ACROSS CREEK FROM BONANZA MINE ; INFO FROM LAND.ST :1976

Commodities

Commodity Importance
Lead Primary
Copper Primary
Silver Primary
Zinc Critical Primary
Gold Secondary
Manganese Critical Tertiary
Titanium, Metal Critical Tertiary

Comments on the commodity information

  • SECONDARY OXIDIZED ORES INCLUDE CERUSSITE, ANGLESITE, COVELLITE

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Pyrite Ore
Sphalerite Ore
Stromeyerite Ore
Tennantite Ore
Anatase Gangue
Apatite Gangue
Barite Gangue
Fluorite Gangue
Limonite Gangue
Quartz Gangue
Rhodochrosite Gangue
Rhodonite Gangue
Rutile 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 ONE ORE SHIPMENT RAN 1.9% PB, 4.7% ZN, 8.8% CU, 124.6 OZ/TON AG, 0.038 OZ/TON AU, 10.75% FE. HAND-PICKED SAMPLES RAN AS HIGH AS 374 OZ/TON AG AND 15% CU. SMELTER RECEIPTS FOR 1920 SHOWED FOLLOWING WEIGHTED AVERAGES AND RANGES FOR 14 LOTS OF CRUDE ORE TOTALLING 323.6 ST: 0.2 OZ/TON AU, RANGE 0.07 TO 0.335 OZ/TON
Result 89.63 OZ/TON AG, RANGE 53.85 TO 146.63 OZ/TON
Result 6.8% CU, RANGE 2.325 TO 14.2%
Result 4.17% PB, RANGE 3.5 TO 4.7%. ON SAME RECEIPT, 19 LOTS OF CONCENTRATES TOTALLING 443.37 ST ASSAYED 0.185 OZ/TON AU, RANGE 0.075 TO 0.3 OZ/TON
Result 70.04 OZ/TON AG, RANGE 29.75 TO 97.9 OZ/TON
Result 12.35% PB, RANGE 4.15 TO 18.35%
Result 4.18% CU, RANGE 1.45 TO 6.55%

Host and associated rocks

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

Nearby scientific data

(1) -106.15143, 38.31362
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

Ore body information

  • Width 6.1M

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
Discovery year 1910
Year of first production 1917
Year of last production 1954

Mining district

District name Bonanza (Kerber Creek)

Land status

Ownership category Private

Ownership information

  • Type Operator
    Owner Bonanza Consolidated Mining Co.
    Home office Salida, Co.
    First year 1955
  • Type Owner
    Owner Stanley Blunt
    Home office Canon City, Co.
    First year 1966

Comments on the production information

  • SEE BONANZA MINE RECORD FOR COMBINED PRODUCTION OF COCOMONGO AND BONANZA MINES 1917-1954.

Comments on the workings information

  • MINE DEVELOPED BY 300-FT-DEEP VERTICAL SHAFT LOCATED 510 FT N 42 W FROM BONANZA SHAFT. TWO LEVELS DEVELOPED DIRECTLY FROM SHAFT AT 200 AND 300 FT DEPTHS, WITH LATTER CONNECTING TO 300 LEVEL OF BONANZA MINE. COCOMONGO ALSO DEVELOPED BY EXTENSION OF 400 LEVEL FROM BONANZA MINE. 200 LEVEL CONTAINS 610 FT OF WORKINGS. TOTAL EXTENT OF 300 AND 400 LEVEL WORKINGS (INCLUDING BONANZA) IS 2130 AND 1900 FT, RESPECTIVELY. MAJOR STOPES LIE BETWEEN 400 AND 300 LEVELS NE AND SE OF SHAFT, AND ABOVE 300 LEVEL NNE OF SHAFT.

Comments on development

  • COCOMONGO CLAIM PATENTED IN 1910 AND DEVELOPED IN 1917-1921. DURING THIS TIME AND IN SUBSEQUENT YEARS, PROPERTY WAS CONSOLIDATED WITH BONANZA AND THEIR PRODUCTION WAS REPORTED JOINTLY. MINE WAS INACTIVE AFTER 1926 EXCEPT FOR SPORADIC PRODUCTION IN 1943 AND 1954. IN 1966 COTTER CORP. LEASED THE PROPERTY FOR EXPLORATION BUT CLOSED IT DOWN THE SAME YEAR.

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.

General comments

Subject category Comment text
Deposit COCOMONGO VEIN DIPS MODERATELY TO STEEPLY NEAR SURFACE BUT FLATTENS TO THE NE WITH DEPTH. HANGING WALL CONTAINS MAJOR STEEPLY DIPPING BRANCH (BONANZA VEIN) AND SEVERAL TRANSVERSE VERTICAL FRACTURES, SOME OF WHICH HAD BEEN STOPED. TRANSVERSE FRACTURES APPEAR TO BRANCH OFF COCOMONGO VEIN AT CURVES OR ROLLS IN FAULT PLANE. NW END OF COCOMONGO VEIN BENDS TO NORTH-SOUTH STRIKE AND APPEARS TO TERMINATE AGAINST OR BE DISPLACED BY GOUGY NORTH- TO NE-DIPPING PREMINERAL FAULT.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-DEC-1981 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.