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Cronje Tunnel

Past Producer in Saguache county in Colorado, United States with commodities Zinc, Silver, Lead, Copper, Gold
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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 10101744
MRDS ID D008212
Record type Site
Current site name Cronje Tunnel

Geographic coordinates

Geographic coordinates: -106.12588, 38.30362 (WGS84)
Elevation 3127
Relative position 14.9 MILES N03E 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 008E 30 SE OF NW OF NE 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 COPPER GULCH 1300 FT NE OF ST. LOUIS MINE ; INFO FROM LAND.ST :(1976)

Commodities

Commodity Importance
Zinc Critical Primary
Silver Primary
Lead Primary
Copper Primary
Gold Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Sphalerite Ore

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 ASSAYS FROM CLIFF TUNNEL YIELD TRACE TO 0.4 OZ/TON AU, 0.7 TO 12.8 OZ/TON AG, TRACE TO 0.8% CU, 0.5 TO 7.4% PB, 18 TO 22% ZN

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

Nearby scientific data

(1) -106.12588, 38.30362
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

  • Dip 60 TO 70SE
    Plunge direction N50E

Controls for ore emplacement

  • See Comments

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Significant No

Mining district

District name Bonanza (Kerber Creek)

Land status

Ownership category Private

Comments on the workings information

  • ACCORDING TO GEOLOGIC MAP, TUNNEL DRIVEN S42E FOR APPROX. 900 FT. AT 750 FT, TUNNEL PRESUMABLY INTERSECTS CLIFF VEIN AND WORKINGS.

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 ABOVE ATTITUDE IS FOR CLIFF VEIN

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.

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.