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Magnet Prospect

Past Producer in Dolores county in Colorado, United States with commodities Iron, Copper, Silver, 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. Mineral occurrence model information
  10. Host and associated rocks
  11. Nearby scientific data
  12. Geologic structures
  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 10014131
MRDS ID D010777
Record type Site
Current site name Magnet Prospect
Related records 10214199

Geographic coordinates

Geographic coordinates: -108.05315, 37.70751 (WGS84)
Elevation 3255
Location accuracy 100(meters)
Relative position 1.6 MILES N 51 W FROM RICO

Site location context

Political divisions (FIPS codes)

Dolores(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Rico(quadrangle 1:24,000 scale)

Dove Creek(quadrangle 1:100,000 scale)

Cortez(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Dolores(hydrologic unit)

Upper Colorado-Dolores(hydrologic accounting unit)

Upper Colorado-Dolores(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 Dolores

Public Land Survey System information

Meridian Township Range Section Fraction State
New Mexico 040N 011W 27 NE Colorado

Comments on the location information

  • (LAND STATUS AND ADMINISTRATIVE AREA LOCATIONS CALCULATED USING GIS OVERLAY ANALYSIS FOR SAN JUAN N. F.). ON NORTH SIDE OF DARLING RIDGE APPROX 0.6 MILE SW OF PUZZLE MINE. ; INFO FROM LAND.ST :1975

Commodities

Commodity Importance
Iron Primary
Copper Tertiary
Silver Tertiary
Gold Tertiary

Materials information

Materials Type of material
Chalcopyrite Ore
Magnetite Ore
Malachite Gangue

Alteration

  • (Local) Oxidation Of Cu Sulfide To Carbonate

Analytical data

Result BEST ORE CONTAINED 65% FE, 0.5 OZ/TON AG, 0.1 OZ/TON AU

Mineral occurrence model information

Model code 72
USGS model code 19a
Deposit model name Polymetallic replacement
Mark3 model number 47

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Monzonite
    Rock unit name Augite Monzonite;Hornblende Latite Porphyry
    Rock description Augite Monzonite;Hornblende Latite Porphyry
    Stratigraphic age (youngest) Pennsylvanian
    Stratigraphic age (youngest) Pennsylvanian
    Stratigraphic age (youngest) Paleocene
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Latite
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone
    Rock unit name Hermosa Formation
    Rock description Hermosa Formation

Nearby scientific data

(1) -108.05315, 37.70751
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description San Juan Uplift, Paradox Basin
Type of structure Local
Structure description Rico Dome

Controls for ore emplacement

  • Favorability Of Limestone For Replacement

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Year of first production 1875
Year of last production 1900

Mining district

District name Pioneer (Rico) District

Land status

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

Comments on development

  • SMALL AMOUNTS OF MAGNETITE WERE MINED FOR SMELTER FLUX AT DURANGO, BUT OPERATION WAS NOT PROFITABLE DUE TO LOW ALLOWABLE COST FOR FE AT SMELTER AND HIGH TRANSPORATATION COSTS FROM MINE.

Reference information

Bibliographic references

  • Deposit

    HARRER, C.M., AND TESCH, W.J., JR., 1959, RECONNAISSANCE OF IRON OCCURRENCES IN COLORADO: USBM IC-7918, P. 27.

  • Deposit

    CROSS, WHITMAN, AND RANSOME, F.L., 1909, DESCRIPTION OF THE RICO QUADRANGLE: USGS FOLIO 130, P. 15.

  • Deposit

    PRATT, W.P., AND OTHERS, 1969, GEOLOGIC MAP OF THE RICO QUADRANGLE, DOLORES AND MONTEZUMA COUNTIES, COLORADO: USGS MAP GQ-797.

  • Deposit

    RANSOME, F.L., 1901, THE ORE DEPOSITS OF THE RICO MOUNTAINS, COLORADO: USGS 22D ANN. REPT., PT. 2, P. 356.

General comments

Subject category Comment text
Deposit LIMESTONE BEDS STRIKE NW AND DIP 45 NE, BUT DEPOSIT IS LIKELY IN LANDSLIDE AND NOT IN PLACE. LIMESTONE FORMING HANGING WALL IS CHERTY, BUT ORE LIES IN SOFT, WHITE, GRANULAR LIMESTONE PENETRATED BY STREAKS OF MAGNETITE AND MALACHITE (OXIDIZED ORE).

Reporter information

Type Date Name Affiliation Comment
Reporter 01-SEP-83 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.