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Little Jenny Mine

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

Geologic information

Identification information

Deposit ID 10012556
MRDS ID D008234
Record type Site
Current site name Little Jenny Mine
Alternate or previous names Jenny Mine, Jennie Mine
Related records 10191585

Geographic coordinates

Geographic coordinates: -106.13032, 38.32945 (WGS84)
Elevation 3450
Relative position 16.5 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 NEAR SOSTHENES GULCH SOUTH OF SOSTHENES MINE ; INFO FROM LAND.ST :(1976)

Commodities

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

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Pyrite Ore
Stromeyerite Ore
Tennantite Ore
Apatite Gangue
Quartz Gangue
Rhodochrosite Gangue
Rhodonite 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 Solution Deposit Ore And Gangue And Caused Micaceous Alteration(Sericite And Chlorite) And Calcite, Quartz, And Pyrite.

Analytical data

Result SEE 1948 AND 1950 PRODUCTION ORE GRADES

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

Nearby scientific data

(1) -106.13032, 38.32945
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 1.83M

Controls for ore emplacement

  • See Comments

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Significant No
Year of first production 1883
Year of last production 1958

Mining district

District name Bonanza (Kerber Creek)

Land status

Ownership category Private

Workings at the site

  • Type of workings Underground
    Length 185.93M
    Overall length 158.5M

Comments on the workings information

  • ONE SHAFT (UNKNOWN DEPTH); INITIAL TUNNEL HEADING S5E FOR 70 FT, THENCE IRREGULARLY FOR 310 FT AT S15 TO 40 E, THENCE 180 FT AT S45 TO 50E.

Comments on development

  • CLAIM ORIGINALLY OPENED BY SHAFT, BUT DRIVING TUNNEL DISCLOSED BLIND ORE BODY WHICH WAS SUBSEQUENTLY DEVELOPED

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 VEIN STRIKES S15E, DIPS STEEPLY WESTWARD TO NEARLY VERTICAL, BUT AT POINT 350 FT FROM PORTAL, VEIN SPLITS, TUNNEL FOLLOWS EAST BRANCH TRENDING S45 TO 50E, 70 NE

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.

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.