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Midnight Mine

Past Producer in Pitkin county in Colorado, United States with commodities Silver, Lead, Zinc, Copper, 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. 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. Ownership information
  16. Production statistics
  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 10013387
MRDS ID D009652
Record type Site
Current site name Midnight Mine
Alternate or previous names See Attachment
Related records 10118311

Geographic coordinates

Geographic coordinates: -106.82256, 39.13221 (WGS84)
Elevation 3231
Relative position 3.9 MILES S 4 W FROM ASPEN

Site location context

Political divisions (FIPS codes)

Pitkin(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Aspen(quadrangle 1:24,000 scale)

Leadville(quadrangle 1:100,000 scale)

Leadville(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Roaring Fork(hydrologic unit)

Colorado Headwaters(hydrologic accounting unit)

Colorado Headwaters(hydrologic subregion)

Upper Colorado(hydrologic region)

Federal lands

White River 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 Pitkin

Public Land Survey System information

Meridian Township Range Section Fraction State
6th Principal 010S;010S;011S;011S 084S;085W;084S;085W 31;25;36;06;01 W2 OF W2 OF S2 (25); N2 (36); SE (36) Colorado

Comments on the location information

  • IN ANNIE BASIN NE OF LITTLE ANNIE TUNNEL. ELEV AND LAT-LONG ARE FOR MIDNIGHT SHAFT ; INFO FROM LAND.ST :(1980)

Commodities

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

Materials information

Materials Type of material
Chalcopyrite Ore
Sphalerite Ore
Barite Gangue
Chert Gangue
Quartz Gangue

Analytical data

Result (SEE LAST PAGE)

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Shale
    Rock unit name Belden Formation
    Rock description Belden Formation
    Stratigraphic age (youngest) Pennsylvanian
    Stratigraphic age (youngest) Paleocene
    Stratigraphic age (youngest) Paleocene
    Stratigraphic age (youngest) Pennsylvanian

Nearby scientific data

(1) -106.82256, 39.13221
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Sawatch Uplift, Central Colorado Trough, Piceance Basin, White River Uplift, Elk Uplift
Type of structure Local
Structure description Castle Creek Fault Zone, Annie Fault, Winnie Fault, Hope Fault

Controls for ore emplacement

  • Breccia And Fault Contact Between Porphyry And Shale

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Year of last production 1951

Mining district

District name Aspen (Roaring Fork) District

Land status

Ownership category Private

Ownership information

  • Type Owner-Operator
    Owner Midnight Mining Co.
    Home office Aspen, Co.
    First year 1951

Production statistics

  • Year 1941
    Accuracy Accurate
    Description Ap_Grade: ^360 Oz/Ton Ag, 53% Pb, 50% Zn
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Conc. Zinc Zinc 50wt-pct
    Major Conc. Lead Lead 53wt-pct
    Major Conc. Silver Silver 10165g/mt
  • Year 1941
    Accuracy Accurate
    Description Ap_Grade: ^20 Oz/Ton Ag, 4% Pb, 5% Zn (Milling Ore)
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Mill Ore Zinc Zinc 5wt-pct
    Major Ore Lead Lead 4wt-pct
    Major Ore Silver Silver 565g/mt
  • Year 1942
    Accuracy Accurate
    Description Ap_Grade: ^25 Oz/Ton Ag, 2.5% Pb, 5% Zn, Trace Cu (Crude And Milling Ore)
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Zinc Zinc 5wt-pct
    Major Ore Lead Lead 3wt-pct
    Major Ore Silver Silver 706g/mt
  • Year 1943
    Accuracy Accurate
    Description Ap_Grade: ^30.5 Oz/Ton Ag, 3% Pb, 5% Zn (Milling Ore)
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Zinc Zinc 5wt-pct
    Major Ore Lead Lead 3wt-pct
    Major Ore Silver Silver 861g/mt
  • Year 1944
    Accuracy Accurate
    Description Ap_Grade: ^15.1 Oz/Ton Ag, 3.7% Pb, 4.5% Zn (Milling Ore)
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Mill Ore Zinc Zinc 5wt-pct
    Major Ore Lead Lead 4wt-pct
    Major Ore Silver Silver 426g/mt
  • Year 1945
    Accuracy Accurate
    Description Ap_Grade: ^15.9 Oz/Ton Ag, 2.78% Pb, 2.15% Zn (Milling Ore)
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Silver Silver 449g/mt
    Major Ore Lead Lead 3wt-pct
    Major Mill Ore Zinc Zinc 2wt-pct
  • Year 1946
    Accuracy Accurate
    Description Ap_Grade: ^10.9 Oz/Ton Ag, 2.58% Pb, 2.15% Zn (Milling Ore)
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Zinc Zinc 2wt-pct
    Major Ore Lead Lead 3wt-pct
    Major Ore Silver Silver 308g/mt
  • Year 1947
    Accuracy Accurate
    Description Ap_Grade: ^9.03 Oz/Ton Ag, 2.03% Pb (Milling Ore)
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Mill Ore Lead Lead 2wt-pct
    Major Ore Silver Silver 256g/mt
  • Year 1948
    Accuracy Accurate
    Description Ap_Grade: ^9.57 Oz/Ton Ag, 1.32% Pb, 1.91% Zn (Milling Ore)
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Zinc Zinc 2wt-pct
    Major Ore Lead Lead 1wt-pct
    Major Ore Silver Silver 270g/mt
  • Year 1949
    Accuracy Accurate
    Description Ap_Grade: ^9.42 Oz/Ton Ag, 1.68% Pb, 3.53% Zn (Milling Ore)
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Mill Ore Zinc Zinc 4wt-pct
    Major Ore Lead Lead 2wt-pct
    Major Ore Silver Silver 266g/mt
  • Year 1950
    Accuracy Accurate
    Description Ap_Grade: ^40.4 Oz/Ton Ag, 2.17% Pb (Crude Ore)
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Lead Lead 2wt-pct
    Major Ore Silver Silver 1141g/mt

Comments on the production information

  • PARTIAL PRODUCTION RECORD. NO PRODUCTION REPORTED IN 1916-17, 1920-23. NO RECORDS FOR 1918-19. LAST YEAR OF PRODUCTION IS 1951. CONCENTRATES NOT RECORDED IN 1942-50.

Workings at the site

  • Type of workings Underground
    Length 3352.8M
    Overall depth 396.24M

Reference information

Bibliographic references

  • Deposit

    SPURR, J. E., 1898, GEOLOGY OF THE ASPEN DISTRICT, COLORADO: USGS MON. 31

  • Deposit

    BRYANT, BRUCE, 1971, GEOLOGIC MAP OF THE ASPEN QUADRANGLE, PITKIN COUNTY, COLORADO: USGS MAP GQ-933

  • Deposit

    BRYANT, BRUCE, 1972, MAP SHOWING MINES, PROSPECTS, AND AREAS OF SIGNIFICANT SILVER, LEAD, AND ZINC PRODUCTION IN THE ASPEN QUADRANGLE, PITKIN COUNTY, COLORADO: USGS MAP I-785-D

  • Deposit

    KNOPF, ADOLPH, 1926, RECENT DEVELOPMENTS IN THE ASPEN DISTRICT, COLORADO: USGS BULL. 785, P. 1-28

  • Deposit

    WILLOUGHBY, F. D., 1937, ROUGH SKETCH OF WORKINGS, MIDNIGHT MINING CO.: UNPUB. MAP

  • Production

    COLO. DIV. MINES ANN. OPERATOR REPTS.

General comments

Subject category Comment text
Deposit (SEE LAST PAGE)
Deposit (SEE ATTACHMENT) ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT

Reporter information

Type Date Name Affiliation Comment
Reporter 01-SEP-1982 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.