1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

McMillan Group

Occurrence in Huerfano county in Colorado, United States with commodities Gold, Silver, Bismuth, Copper, Tellurium
Map
XML
JSON
KML
B
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. Mineral occurrence model information
  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. Links to other databases
  18. Bibliographic references
  19. Reporter information

Geologic information

Identification information

Deposit ID 10011673
MRDS ID D006754
Record type Site
Current site name McMillan Group
Alternate or previous names Courthouse vein system

Geographic coordinates

Point of reference Approximate
Geographic coordinates: -105.4864, 37.5903 (WGS84)
Elevation 3682
Location accuracy 1000(meters)
Relative position 11 MILES N 8 W FROM BLANCA

Site location context

Political divisions (FIPS codes)

Huerfano(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Blanca Peak(quadrangle 1:24,000 scale)

Blanca Peak(quadrangle 1:100,000 scale)

Trinidad(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Huerfano(hydrologic unit)

Upper Arkansas(hydrologic accounting unit)

Upper Arkansas(hydrologic subregion)

Arkansas-White-Red(hydrologic region)

Federal lands

Pike and San Isabel National Forests(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States Colorado Huerfano

Public Land Survey System information

Meridian Township Range Section Fraction State
6th Principal 028S;028S 073W;072W 25;30 Colorado

Comments on the location information

  • ON NORTH SLOPE OF BLANCA PEAK IN HEADWATERS OF HUERFANO RIVER. LAT-LONG GIVEN IS PROJECTED EAST QUARTER-CORNER OF SEC. 25. ; INFO FROM LAND.ST :(1975)

Commodities

Commodity Importance
Gold Primary
Silver Primary
Bismuth Critical Tertiary
Copper Tertiary
Tellurium Critical Tertiary

Materials information

Materials Type of material
Hessite Ore
Sylvanite Ore

Mineral occurrence model information

Model code 82
USGS model code 22
Deposit model name Epithermal veins

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
  • Host or associated Associated
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Hornblendite
    Rock unit name Hornblende Diorite;Intermediate Stocks, Laccoliths, Plugs, Dikes, And Sills
    Rock description Hornblende Diorite;Intermediate Stocks, Laccoliths, Plugs, Dikes, And Sills
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock
  • Host or associated Host
    Rock type Metamorphic Rock > Gneiss
    Rock unit name Granodiorite Gneiss;Metaquartzite
    Rock description Granodiorite Gneiss;Metaquartzite

Nearby scientific data

Approximate (1) -105.4864, 37.5903
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Sierra Blanca Massif, Rio Grande Rift Zone, Ft. Garland Embayment
Type of structure Local
Structure description Sangre De Cristo Mtns Thrust Fault

Ore body information

  • General form TABULAR
    Strike VEINS N 7 W
    Dip VEINS 90
    Width 18.29M

Controls for ore emplacement

  • Nw-Trending Precambrian Dike Swarm

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name Blanca District District

Land status

Ownership category National Forest

Comments on the workings information

  • CROSSCUT TUNNEL AND 40-TON CONCENTRATING MILL

Reference information

Bibliographic references

  • Deposit

    VANDERWILT, J.W., 1947, MINERAL RESOURCES OF COLORADO: COLORADO MINERAL RESOURCES BD., P. 31.

  • Deposit

    ECKEL, E.B., 1961, USGS BULL. 1114, P. 322-323.

  • Deposit

    COLO. DIV. MINES 1901-02 BIENN. REPT., P. 97-98.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-APR-81 Schwochow, Stephen D. Colorado Geological Survey
Updater 01-MAY-83 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.