Bonnie Girl Mine

Past Producer in La Plata county in Colorado, United States with commodities Gold, Silver, Copper
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. Mineral occurrence model information
  10. Host and associated rocks
  11. Nearby scientific data
  12. Geologic structures
  13. Economic information about the deposit and operations
  14. Mining district
  15. Land status
  16. Links to other databases
  17. Bibliographic references
  18. General comments
  19. Reporter information

Geologic information

Identification information

Deposit ID 10014155
MRDS ID D010805
Record type Site
Current site name Bonnie Girl Mine
Alternate or previous names Baker Contact
Related records 10264336

Geographic coordinates

Geographic coordinates: -108.03982, 37.39945 (WGS84)
Elevation 3261
Relative position 12 MILES N 48 W FROM DURANGO

Site location context

Political divisions (FIPS codes)

La Plata(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

La Plata(quadrangle 1:24,000 scale)

Cortez(quadrangle 1:100,000 scale)

Cortez(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Middle San Juan(hydrologic unit)

Upper San Juan(hydrologic accounting unit)

San Juan(hydrologic subregion)

Upper Colorado(hydrologic region)

Federal lands

San Juan 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 La Plata

Public Land Survey System information

Meridian Township Range Section Fraction State
New Mexico 036N 011W O2 S2 Colorado

Comments on the location information

  • (LAND STATUS AND ADMINISTRATIVE AREA LOCATIONS CALCULATED USING GIS OVERLAY ANALYSIS FOR SAN JUAN N. F.). NE OF TIRBIRCIO CREEK ON WEST SLOPE OF BAKER PEAK, 1.35 MILES ENE OF LA PLATA TOWNSITE (UNSURVEYED SECTION). ; INFO FROM LAND.ST :1974

Commodities

Commodity Importance
Gold Primary
Silver Primary
Copper Tertiary

Materials information

Materials Type of material
Chalcopyrite Ore
Garnet Gangue
Magnetite Gangue

Alteration

  • (Local) Oxidation Of Pyrite To Limonite

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Rock unit name Porphyritic Rocks--Diorite-Monzonite Porphyry
    Rock description Porphyritic Rocks--Diorite-Monzonite Porphyry
    Stratigraphic age (youngest) Paleocene
    Stratigraphic age (youngest) Paleocene
    Stratigraphic age (youngest) Late Permian
    Stratigraphic age (youngest) Late Permian
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Shale
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Sandstone
    Rock unit name Cutler Formation
    Rock description Cutler Formation

Nearby scientific data

(1) -108.03982, 37.39945

Economic information

Geologic structures

Type of structure Regional
Structure description San Juan Uplift, Four Corners Platform
Type of structure Local
Structure description La Plata Dome

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1895
Year of first production 1895
Year of last production 1919

Mining district

District name California (La Plata) District

Land status

Ownership category National Forest
Area name San Juan N. F.

Comments on the production information

  • PARTIAL PRODUCTION RECORD. PRODUCTION PRIOR TO 1902 UNKNOWN BUT CONSIDERED SMALL. NO PRODUCTION FOR OTHER YEARS EXCEPT THOSE SHOWN.

Comments on the workings information

  • MAIN WORKING IS SMALL HILLSIDE OPEN CUT; SEVERAL EXPLORATORY ADITS TOTALING 700 FT; 225-FT ADIT DRIVEN N 80 E SITUATED JUST EAST OF OPEN CUT; LOWER TUNNEL DRIVEN N 32 E FOR 125 FT WITH GENERALLY EASTWARD BRANCH 140 FT DRIVEN AT 45 FT FROM PORTAL: REMNANTS OF AERIAL TRAM THAT CONNECTED MINE TO GOLD KING MILL.

Comments on development

  • DEPOSIT DISCOVERED 1895 OR EARLIER AND PERHAPS PRODUCED SMALL AMOUNT OF ORE TO 1902. RECORDED INTERMITTENT PRODUCTION IN 1906, 1908, AND 1919. ABOUT 1904, 50-STAMP MILL BUILT AT MOUTH OF TIRBIRCIO CREEK AND WAS CONNECTED TO MINE VIA AERIAL TRAM. MILL OPERATED ONLY A FEW YEARS, BUT RUMOR SAYS IT PRODUCED LARGE QUANTITY OF AMALGAM, BUT US MINT FOUND IT TO CONTAIN CU RATHER THAN AU. MILL LATER REMODELED AS GOLD KING MILL.

Reference information

Bibliographic references

  • Deposit

    ECKEL, E.B., AND OTHERS, 1949, GEOLOGY AND ORE DEPOSITS OF THE LA PLATA DISTRICT, COLORADO: USGS PROF. PAPER 219, P. 67-68, 96-97

  • Production

    ECKEL AND OTHERS, 1949 (AS COMPILED FROM USGS AND USBM RECORDS)

General comments

Subject category Comment text
Deposit COUNTRY ROCK CONSISTS OF METAMORPHOSED CUTLER FM RED BEDS INTRUDED BY DIORITE-MONZONITE PORPHYRY SILLS AND DIKES AND CUT BY ENE-WSW-TRENDING VEIN. NO STRONG VEINS WERE SEEN IN MINE WORKINGS BUT RATHER MANY ZONES AND LENSES OF BRECCIATED AND ALTERED ROCK BEARING PYRITE AND QUARTZ. GOLD PRODUCED BELIEVED TO HAVE BEEN FROM OXIDIZED ZONE NEAR SURFACE.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-AUG-1983 Schwochow, Stephen D. Colorado Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

External references

Authoritative Colorado resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.