Mount Diablo Mine

Past Producer in Contra Costa county in California, United States with commodity Mercury

Geologic information

Identification information

Deposit ID 10040642
MRDS ID M055494
Record type Site
Current site name Mount Diablo Mine
Alternate or previous names Ryne, Bagley Creek
Related records 10138061

Geographic coordinates

Geographic coordinates: -121.8791, 37.90157 (WGS84)
Elevation 290
Relative position 30 MI NE OF SAN FRANCISCO; ON EASTERN SIDE OF THE NORTH PEAK OF MT. DIABLO
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Geographic areas

Country State County
United States California Contra Costa

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 001N 001E 29 California

Comments on the location information

  • SE/4 SEC. 29.

Commodities

Commodity Importance
Mercury Primary

Materials information

Materials Type of material
Cinnabar Ore
Metacinnabar Ore
Calcite Gangue
Chalcedony Gangue
Chromite Gangue
Dolomite Gangue
Marcasite Gangue
Opal Gangue
Pyrite Gangue
Quartz Gangue
Stibnite Gangue

Alteration

  • (Local) Silica Carbonate Alteration Of Serpentine

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite
    Stratigraphic age (youngest) Late Jurassic
    Stratigraphic age (youngest) Late Cretaceous
  • Host or associated Host
    Rock type Metamorphic Rock > Serpentinite
    Rock unit name Franciscan Complex
    Rock description Franciscan Complex

Nearby scientific data

(1) -121.8791, 37.90157

Ore body information

  • General form IRREGULAR, TABULAR
    Dip N50E
    Thickness 1.83M
    Width 60.96M
    Length 39.62M

Comments on the geologic information

  • RHYOLITE PLUGS NEARBY. BITUMINOUS CLAYS (BLACK ALTA).

Economic information

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Medium
Significant No
Discovery year 1863
Discoverer Mr. Welch
Year of first production 1875

Mining district

District name Mount Diablo

Ownership information

  • Type Operator
    Owner Nevada Scheelite Co.
    First year 1956
  • Type Owner
    Owner Guadelupe Mining Co.

Production statistics

  • Year 1962
    Period To 1962
    Material HG
    Accuracy Estimate
    Description Cp_Grade: ^6 Lb/Ton
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Mercury Mercury 2711g/mt

Comments on the production information

  • LAST PRODUCED IN 1953

Comments on the reserve resource information

  • LOW GRADE RESERVES STILL EXIST AT MINE, 17,000 TONS OF INDICATED AND INFERRED RESERVES

Workings at the site

  • Type of workings Surface/Underground
    Length 1219.2M
    Overall depth 152.4M

Comments on the workings information

  • FLOODED

Comments on development

  • ECON.COM: LANDSLIDES; VOLATILE GASES

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS M055494

Bibliographic references

  • Deposit

    BAILEY, E. H., USGS, PERSONAL FILES.

  • Deposit

    HOLMES, G. W., JR., 1965, MERCURY IN CALIFORNIA: IN USBM IC 8252.

  • Deposit

    ROSS, C. P., 1940, QUICKSILVER DEPOSITS OF THE MOUNT DIABLO DISTRICT, CONTRA COSTA COUNTY, CALIFORNIA: USGS BULL. 922 - B.

  • Deposit

    DAVIS, F.F. AND GOLDMAN, H.B., 1958, MINES AND MINERAL RESOURCES OF CONTRA COSTA COUNTY, CALIFORNIA: CJMG V. 54, P. 530-535

  • Deposit

    1955 DIREXPL DMEA UNSUCCESSFUL IN DISCOVERING NEW OR

  • Production

    USBM DATA

General comments

Subject category Comment text
Deposit INDIANS USED THE CINNABAR IN TRIBAL CEREMONIES. LATER WAS MINED AS A PLACER ; INFO.SRC : BAILEY E H

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JAN-1976 Gassaway, J. S. U.S. Geological Survey