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Vallejo Tunnel

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

Geologic information

Identification information

Deposit ID 10012557
MRDS ID D008235
Record type Site
Current site name Vallejo Tunnel
Related records 10142963

Geographic coordinates

Geographic coordinates: -106.1306, 38.33001 (WGS84)
Elevation 3414
Relative position 16.8 MILES N02E 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 18 NE 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 IN SOSTHENES GULCH NEAR SOSTHENES MINE ; INFO FROM LAND.ST :(1976)

Commodities

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

Materials information

Materials Type of material
Galena Ore
Pyrite 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 4-TON ORE SHIPMENT IN 1954 ASSAYED 0.09 TO 0.11 OZ/TON AU, 11 TO 11.4 OZ/TON AG, 5.4 TO 5.8% PB, 9.5 TO 10% ZN, 0.7% CU

Host and associated rocks

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

Nearby scientific data

(1) -106.1306, 38.33001
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

  • General form N70 TO 75E
    Dip 45 TO 50 SE

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

Workings at the site

  • Type of workings Underground
    Area 0.405HA
    Length 128.02M
    Overall length 70.1M
    Overall width 57.91M

Comments on the workings information

  • TUNNEL DRIVEN 5 FT AT S35E TO VEIN, THENCE 45 FT AT S50E, THENCE N65E FOR AT LEAST 20 FT INTO CAVED AREA. AT INTERSECTION OF TUNNEL AND VEIN, WINZE SUNK TO UNKNOWN DEPTH ON VEIN. DRIFT PROCEEDS 210 FT AT N70 TO 85E INTO CAVED AREA. AT 170 FT ALONG DRIFT, 100 FT OF CROSSCUT AND DRIFT DEVELOPED ALONG FOUR OTHER SMALL VEINS. IN MID TO LATE 1950'S, OPERATORS WERE EXTENDING TUNNEL SOUTHEASTWARD TO CONNECT WITH LITTLE JENNIE WORKINGS TO PROVIDE ANOTHER EXIT AND VENTILATION.

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; DISTRICT, COLORADO; USGS PROF. PAPER 169, 166 P.

General comments

Subject category Comment text
Deposit APPARENTLY SAME VEIN AS ON MAY QUEEN CLAIM

Reporter information

Type Date Name Affiliation Comment
Reporter 01-NOV-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.