Creede Formation

Producer in Mineral county in Colorado, United States with commodities Silver, Barium-Barite, Manganese

Geologic information

Identification information

Deposit ID 10118250
MAS/MILS ID 0080790003
Record type Site
Current site name Creede Formation
Alternate or previous names Bachelor Mountain

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: -106.93812, 37.87941 (WGS84)
Elevation 3109
Location accuracy 10(meters)
(click for info)

Geographic areas

Country State County
United States Colorado Mineral

Public Land Survey System information

Meridian Township Range Section Fraction State
New Mexico 042 N 001 W 23 Colorado

Commodities

Commodity Importance
Silver Primary
Barium-Barite Tertiary
Manganese Tertiary

Materials information

Materials Type of material
Acanthite Unknown
Barite Unknown
Calcite Unknown
Manganite Unknown
Pyrolusite Unknown
Quartz Unknown
Silver Unknown

Nearby scientific data

Ore Body (1) -106.93812, 37.87941

Ore body information

  • Thickness 60M
    Depth to top 100M
    Width 310M
    Length 1520M
    Field Value
    MAS Column # 1
    Type of Orebody #1 REPLACEMENT
    Shape of Orebody #1 LENTICULAR
    Type of Orebody #2 DISSEMINATED
    Shape of Orebody #2 IRREGULAR
    Primary mode of Origin HYDROTHERMAL
    Primary Ore Control IGNEOUS
    Secondary Ore Control LITHOLOGY
    Degree of Wallrock Alter. MODERATE
    Type of Wallrock Alter. #1 INTERM ARGILLIC
    Minimum Depth to Top 20
    Avg. Thick. Unconsol. Mat. 5
    Min. Thick. Unconsol. Mat. 0
    Date of Last Modification 810721
  • Area 90HA
    Field Value
    Total Surface Area (HA) 90
    Date of Last Modification 910418

Comments on the geologic information

  • THE CREEDE FM CONSISTS OF SEVERAL DISTINCT FACIES, EACH OF WHICH SHOWS MANY LOCAL VARIATIONS. THIN-BEDDED TUFFACEOUS LAKE DEPOSITS, LARGELY SHALE AND SANDSTONE WITH SOME TUFF BEDS, CONSTITUTE THE PREDOMINATE FACIES. THESE ROCKS INTERTONGUE MARGINALLY WITH FLUVIATILE SANDSTONE AND CONGLOMERATE BEDS. VOLCANIC BRECCIAS, TRAVERTINE AND CALCAREOUS TUFA, AND BENTONITE BEDS ALSO PRESENT. THE OREBODY IN THE CREEDE FM IS A SILVER REPLACEMENT OF CARBONACEOUS MATERIAL IN FLUVIAL DEBRIS. THE MATERIAL IS VERY POORLY SORTED, BOULDERS TO 2 METERS, AND FOLLOWS OLD CHANNELS ON BACHELOR MOUNTAIN. THE GRADE RANGES FROM 68-617 PPM SILVER AT THICKNESSES FROM 4.8-8.0 METERS. (GENTRY, SEPTEMBER 1976).
  • NATIVE SILVER OCCURS WITH MANGANGSE MINERALS

Economic information

Economic information about the deposit and operations

Operation type Underground
Development status Producer
Commodity type Both metallic and non-metallic
Significant Yes
Discovery year 1973

Comments on exploration

  • A TOTAL OF 73 ROTARY AND CORE HOLES HAVE BEEN DRILLED ON THE PROPERTY (AS OF JAN 1981).

Mining district

District name Solomon

Mineral rights holdings

Type of mineral rights Patented
Type of mineral rights Located Claim

Land status

Ownership category National Forest

Ownership information

  • Type Owner
    Owner Minerals Engineering Co.
    ID 502905
    Interest 50
    Home office 950 17th, Denver, Co 80202
    Year 1981
  • Type Owner-Operator
    Owner Homestake Mining Co.
    ID 502905
    Interest 50
    Home office 650 Calif. St, San Francisco, Ca 94108

Reserves and resources

  • Type In-situ
    Estimate year 1981
    Demonstrated 3,037,000mt ore
    Indicated 3,037,000mt ore
    Total resources 3,037,000mt ore
    Commodity Subtype Grade units Group Importance Year
    Silver Ag 219 g/mt Silver Major 1981

Comments on the reserve resource information

  • R1=M1C1. ESTIMATED THAT 30% OF PROVEN + PROBABLE RESERVES ARE CLAS- SIFIED AS PROVEN. MINERALIZED AREA WAS DIVIDED INTO NORTH, CENTRAL, & SOUTH BLOCKS. ONLY CENTRAL BLOCK WAS USED IN THE MINING AND ECONOMIC ANALYSES BECAUSE OF INCOMPLETE DATA FOR THE OTHER AREAS. AFTER MAKING ADJUSTMENTS TO THE GEOLOGIC RESERVES FOR MINING RECOVERY AND DILUTION, THE PROVEN AND PROBABLE MINABLE RESERVES WERE CALCULATED TO BE 3,348 MILLION SHORT TONS AT A GRADE OF 6.39 OZ/SHT SILVER (1980 SEC FORM 10-K P 4.)

Workings at the site

  • Type of workings Underground
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method PROPOSED
    Mining Method ROOM AND PILLAR 10-34
    Hardness of Rock UNKNOWN
    Rock Characteristics UNKNOWN
    Rock Support Chars. UNKNOWN
    Mine Support Chars. UNKNOWN
    Capacity 1524
    Capacity Units MT ORE/DAY
    Operating Days per Year 250

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
U.S. Bureau of Mines Minerals Availability System MAS 0080790003
Mine Safety and Health Administration MSHA MSHA 0502905

Bibliographic references

  • Geology

    STEVEN, T. A., AND J. C. RATTE, GEOLOGY AND STRUCTURAL CONTROL OF ORE DEPOSITION IN THE CREEDE DISTRICT SAN JUAN MOUNTAINS COLORADO, USGS PROF. PAPER 487, 1965, 90 PP.

  • Geology

    GENTRY DON W. MINERALS ENGINEERING COMPANY IN LEAD AND ZINC DEPOSITS IN COLORADO AND WYOMING,. USBM GRANT GO264005, SEPTEMBER 1976. 9 PP.

  • Reserve-Resource

    MINERALS ENGINEERING SEC FORM 10-K REPORT, DEC 31, 1980, P 4

  • Workings

    MINERALS ENGINEERING SEC FORM 10-K REPORT, DEC 31, 1980,P 4

General comments

Subject category Comment text
Deposit NOTE: DATA TO COMPLETE FILE NOT PRESENTLY OBTAINABLE HOWEVER THE EVALUATOR FEELS THAT MINERALS ENGINEERING AND HOMESTAKE MINING WILL BE RELEASING MORE INFORMATION ON THE DEPOSIT BY THE END OF 1981.

Reporter information

Type Date Name Affiliation Comment
Reporter 27-FEB-1984 Hite, Alan G. U.S. Bureau of Mines