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Mazza Mazza Ranch

Prospect in Marin county in California, United States with commodity Manganese
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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. Nearby scientific data
  9. Ore body information
  10. Economic information about the deposit and operations
  11. Ownership information
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10030799
MRDS ID M009221
Record type Site
Current site name Mazza Mazza Ranch
Related records 10212439

Geographic coordinates

Geographic coordinates: -122.63912, 38.16322 (WGS84)
Relative position 6.5 MI S. OF PETALUMA, 2.5 MI. S.E. OF UNION SCHOOL.

Site location context

Political divisions (FIPS codes)

Marin(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Petaluma(quadrangle 1:24,000 scale)

Napa(quadrangle 1:100,000 scale)

Santa Rosa(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

San Pablo Bay(hydrologic unit)

San Francisco Bay(hydrologic accounting unit)

San Francisco Bay(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California Marin

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 004N 007W 28 California

Comments on the location information

  • LOCATED IN SW 1/4 SECTION 28; LATITUDE-LONGITUDE VALUES CALCULATED FROM TOWNSHIP, RANGE, SECTION.

Commodities

Commodity Importance
Manganese Critical Tertiary

Materials information

Materials Type of material
Cinnabar Gangue
Pyrite Gangue

Nearby scientific data

(1) -122.63912, 38.16322
ListMap

Economic information

Ore body information

  • Strike N 25 E
    Dip 60 SE

Comments on the geologic information

  • GEOL.DESC: ORE BODY LIES PARALLEL TO ENCLOSING CHERT, STRIKES N 25 E, DIPPING 60 SE. THE HANGING WALL IS SOFT BROWN IRON STAINED CHERT AND THE FOOTWALL IS COVERED BY ALLUVIUM. THE ORE BODY IS 15 FT. THICK, AND IS GRAY AND PINK CARBONATE WITH A PROGRESSIVE SILICA CONTENT TOWARD THE FOOTWALL. QUARTZ VEINS CUT THE ORE, AND MASSES OF PYRITE AND SPECKS OF CINNABAR ARE PRESENT. A SMALL AMOUNT OF OXIDE IS FOUND ALONG HANGING WALL.

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic
Significant No
Discovery year 1915

Ownership information

  • Type Operator
    Owner Francis A. Mazza

Comments on the production information

  • DEVELOPED BY M. VONSEN DURING WWI BUT NO SHIPMENTS WERE MADE. IDLE AND PIT IS NEARLY FILLED WITH MATERIAL BULLDOZED FROM A NEARBY TRAIL.

Comments on the workings information

  • PIT ABOUT 30 FT. IN DIAMETER.

Reference information

Bibliographic references

  • Deposit

    CALIF. JOUR. MINES & GEOL. V. 51, NO. 3, JULY 1955, P. 262, 282, PL. 4

  • Deposit

    DOM BULL. 125, P. 131

  • Deposit

    D.O.M. BULL. 152 1950 P. 106

General comments

Subject category Comment text
Deposit THE PROPORTION OF SILICA IS SO HIGH THAT THE PRODUCTION OF MANGANESE ORE SEEMS UNLIKELY.
Deposit Discovery Year: WWI

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1973 Gere, W. U.S. Geological Survey
Updater 01-DEC-1977 Killman, K.; Albers, J. U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative California resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.