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Iowa Mine

Past Producer in Rio Grande county in Colorado, United States with commodities Gold, Silver, 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. Alteration
  8. Host and associated rocks
  9. Nearby scientific data
  10. Geologic structures
  11. Controls for ore emplacement
  12. Economic information about the deposit and operations
  13. Mining district
  14. Land status
  15. Workings at the site
  16. Links to other databases
  17. Bibliographic references
  18. General comments
  19. Reporter information

Geologic information

Identification information

Deposit ID 10101861
MRDS ID D010654
Record type Site
Current site name Iowa Mine
Alternate or previous names Patented Claim: Iowa, Ms 895
Related records 10288691

Geographic coordinates

Geographic coordinates: -106.5956, 37.4203 (WGS84)
Elevation 3619
Relative position 0.67 MILES S 11 W FROM SUMMITVILLE

Site location context

Political divisions (FIPS codes)

Rio Grande(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Summitville(quadrangle 1:24,000 scale)

Antonito(quadrangle 1:100,000 scale)

Durango(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Alamosa-Trinchera(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 Rio Grande

Public Land Survey System information

Meridian Township Range Section Fraction State
New Mexico 037N 004E 30 SE OF SW Colorado

Comments on the location information

  • ON ESE SLOPE OF SOUTH MTN. PORTAL ELEV FROM STEVEN AND RATTE (1960, PL. 4). ; INFO FROM LAND.ST :1975

Commodities

Commodity Importance
Gold Primary
Silver Primary
Copper Secondary

Alteration

  • (Local) Quartz-Alunite Solfataric Alteration

Analytical data

Result ANALYSES OF AURIFEROUS LIMONITE FROM IOWA TUNNEL AT INTERSECTION WITH BLACK WONDER (OR GOLCONDA) VEIN (PATTON, 1917): STALACTITES, 0.12 OZ/TON AU, 0.5 OZ/TON AG
Result STALAGMITES, 0.35 OZ/TON AU, 2 OZ/TON AG. ASSAYS FROM CARPER (1914): 1.28 OZ/TON AU, 9.7 OZ/TON AG (AT $20.65/OZ AU, $0.60/OZ AG).

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Quartz Latite
    Rock unit name Quartz Latite Of South Mountain;Summitville Andesite
    Rock description Quartz Latite Of South Mountain;Summitville Andesite
    Stratigraphic age (youngest) Miocene
    Stratigraphic age (youngest) Miocene
  • 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 > Quartz Latite
    Rock unit name Quartz Latite Of South Mountain;Summitville Andesite
    Rock description Quartz Latite Of South Mountain;Summitville Andesite

Nearby scientific data

(1) -106.5956, 37.4203
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description San Juan Volcanic Field
Type of structure Local
Structure description Platoro Caldera, Summitville Caldera, Summitville Fault, South Mountain Dome

Controls for ore emplacement

  • Quartz-Alunite Solfataric Replacement Bodies Following Nw-Trending Fractures Near Sw Margin Of South Mountain Feeder Conduit

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1882
Discoverer Governor Gier (Iowa)
Year of first production 1882

Mining district

District name Summit (Summitville) District

Land status

Ownership category Private

Workings at the site

  • Type of workings Surface/Underground
    Length 2093.98M
    Overall length 731.52M

Comments on the workings information

  • IOWA CROSSCUT TUNNEL DRIVEN S 48 W FOR 530 FT TO TEWKSBURY VEIN ZONE, CONTINUING 300 FT AND BRANCHING INTO TWO TUNNELS TO AZTEC VEIN. IOWA LEVEL DRIFTS AND STOPES DEVELOPED ON SOUTH AND NORTH TEWKSBURY VEINS, AZTEC-BLACK WONDER, AND HIDDEN VEINS. TOTAL CROSSCUTS APPROX 1470 FT; DRIFTS APPROX 5400 FT; OPEN CUTS AND GLORY HOLES TO SURFACE (SUCH AS SOUTH TEWKSBURY STOPE) DEVELOPED ABOVE LEVEL.

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit SOUTH TEWKSBURY VEIN ZONE TRENDS N 30 W, NEARLY VERTICAL, AND CONSISTS OF DISCONTINUOUS HIGHLY SILICIFIED ROCK (VUGGY QUARTZ ROCK OF QUARTZ-ALUNITE ZONE). SOME ARGILLIC/PROPYLITIC ZONE ALTERATION ON SW SIDE OF VEIN. LARGE MASS OF COMPACT QUARTZ ROCK AT NORTH END OF SOUTH ZONE. NORTH TEWKSBURY VEIN ZONE TRENDS N 20 TO 35 W AND APPARENTLY DIPS 75 NE DOWN TO COPPER HILL LEVEL AND 85 NE BETWEEN COPPER HILL AND REYNOLDS LEVELS. SMALL MASS OF VUGGY QUARTZ ROCK AT NORTH END. AZTEC-BLACK WONDER VEIN ZONE TRENDS GENERALLY NORTH TO NW AND CONSISTS OF DISCONTINUOUS INTERSECTING VEINS, PIPES, AND IRREGULAR PODS IN HIGHLY SILICIFIED QUARTZ LATITE SURROUNDED BY SOFT ARGILLIZED ENVELOPE OVER PIPE AT SE END. AZTEC PIPE APPARENTLY LOCALIZED AT INTERSECTION OF FRACTURES. DISCONTINUOUS IRREGULAR BLACK WONDER VEIN VERTICAL DOWN TO IOWA LEVEL WHERE IT MAY JOIN TEWKSBURY VEIN.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1983 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.