Santa Rosa

Past Producer in Inyo county in California, United States with commodities Lead, Copper, Silver, Zinc, Gold

Geologic information

Identification information

Deposit ID 10076644
MRDS ID W023780
Record type Site
Current site name Santa Rosa
Related records 10261129

Geographic coordinates

Geographic coordinates: -117.72313, 36.41803 (WGS84)
Elevation 2057
(click for info)

Geographic areas

Country State County
United States California Inyo

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 017S 039E 35 California

Comments on the location information

  • UTM ACC. ; INFO FROM LAND.ST :UNDETERMINED

Commodities

Commodity Importance
Lead Primary
Copper Primary
Silver Secondary
Zinc Secondary
Gold Secondary

Comments on the commodity information

  • GRADE OF ORE IS ERRATIC, RICHEST ORE OCCURS IN SHOOTS IN THICKER PARTS, OF VEINS.

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Hemimorphite Ore
Pyrite Ore
Sphalerite Ore
Calcite Gangue

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Stratigraphic age (youngest) Late Permian
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Mafic Volcanic Rock > Basalt
  • Host or associated Host
    Rock type Metamorphic Rock > Hornfels

Nearby scientific data

(1) -117.72313, 36.41803

Geologic structures

Type of structure Local
Structure description Fault; Inlier Of Calc - Hornfels Is Structurally A Horst, Santa Rosa Fault Bounds It On The East And Another Steep Fault Forms The Western Boundary. Santa Rosa Fault Strikes North, Dips 80 E, Its A Normal Fault, East Block Downdropped About 250 Ft. Most Important Faults Strike N 10 - 20 W, Dip 30 - 60 Sw.

Controls for ore emplacement

  • Fissure Filling

Comments on the geologic information

  • GEOL.DESC: MINE IS WITHIN INLIER OF LOWER LIMESTONE MEMBER OF OWENS VALLEY FORMATION, HAS BEEN METAMORPHOSED. INLIER IS 2,000 FT. LONG AND 600 FT. WIDE. IT IS ENCIRCLED BY TERTIARY AND QUATERNARY VOLCANIC ROCKS CONSISTING OF OLIVINE BASALT, TUFF, TUFF - BRECCIA, AGGLOMERATE AND ANDESITE. CALC - HORNFEL CONSISTS MAINLY OF CALCITE, QUARTZ AND DIOPSIDE, MINOR ZOISITE, GARNET, EPIDOTE, LIMONITE AND OPAQUE MINERALS. MINOR BEDS OF UNSILICATED BLUISH - GRAY LIMESTONE, LOCALLY FOSSILIFEROUS ARE INTERBEDDED WITH CALC - HORNFELS. INLIER IS CUT BY SYENO - DIORITE PORPHYRY DIKES, 2 - 6 FT. THICK, STRIKE N 70 W, DIP NEAR VERTICAL. 2 - 16 FT. THICK BASALT DIKES, CUT BOTH LIMESTONE AND VOLCANIC ROCKS.

Economic information

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Large
Significant No
Production years 1910 - 1950

Comments on the production information

  • 1910 - 1950 , 36,854 SHORT TONS OF ORE WAS MINED

Comments on the workings information

  • 352 FT. HESSON INCLINED SHAFT, SEVERAL SHALLOWER SHAFTS, ABOUT 1,500 FT. OF DRIFTS AND CROSSCUTS, EXTENSIVE STOPES. AN 1,800 FT. WESTERLY TRENDING CROSSCUT ADIT WAS DRIVEN IN 1953 .

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS W023780

Bibliographic references

  • Deposit

    HALL, W. E. AND MACKEVETT, E. M., 1958 , ECONOMIC GEOLOGY OF THE DARWIN QUADRANGLE, INYO COUNTY, CALIFORNIA; DIV. OF MINES. SPECIAL REPORT 51 , P. 53 - 54

  • Production

    HALL, W. E. AND MACKEVETT, 1958 , P. 53 (SEE REF.)

General comments

Subject category Comment text
Deposit AT LEAST 12 VEINS EXPOSED FROM 100 FT TO 700 FT. IN LENGTH, 3 - 4 FT. THICK, MOST ABUNDANT ARE WEST DIPPING VEINS.
Deposit SOME ZINC - RICH PRIMARY ORE WAS DISCOVERED AND BEING MINED IN 1955 .

Reporter information

Type Date Name Affiliation Comment
Reporter 01-AUG-1978 Fraticelli, L. A. (Albers, J.) U.S. Geological Survey