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Welch Mine

Producer in San Luis Obispo 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. Host and associated rocks
  9. Nearby scientific data
  10. Ore body information
  11. Economic information about the deposit and operations
  12. Links to other databases
  13. Bibliographic references
  14. Reporter information

Geologic information

Identification information

Deposit ID 10111014
MRDS ID W025012
Record type Site
Current site name Welch Mine
Related records 10189733

Geographic coordinates

Geographic coordinates: -120.77876, 35.27053 (WGS84)
Elevation 305
Relative position ON THE E. SIDE OF A CANYON WHICH RUNS N. ABOUT 1/2 MI. TO JOIN CLARK VALLEY, 13 MI. BY ROAD TO SAN LUIS OBISPO.

Site location context

Political divisions (FIPS codes)

San Luis Obispo(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Morro Bay South(quadrangle 1:24,000 scale)

San Luis Obispo(quadrangle 1:100,000 scale)

San Luis Obispo(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Central Coastal(hydrologic unit)

Central California Coastal(hydrologic accounting unit)

Central California Coastal(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California San Luis Obispo

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 030S 011E 34 California

Comments on the location information

  • LOCATED IN NW 1/4 SE 1/4 SECTION 34 ; INFO FROM LAND.ST :UNDETERMINED

Commodities

Commodity Importance
Manganese Critical Primary

Materials information

Materials Type of material
Hausmannite Ore

Analytical data

Result ORE GRADE 47 PERCENT MANGANESE, 16 PERCENT SILICA.

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Chemical Sediment > Chert
    Stratigraphic age (youngest) Late Cretaceous

Nearby scientific data

(1) -120.77876, 35.27053
ListMap

Economic information

Ore body information

  • Thickness 1.22M

Comments on the geologic information

  • ORE HOSTED IN FRANCISCAN COMPLEX--L. TO L. ; GEOL.DESC: ORE OCCURS WITHIN CHERT BODY ON CONTACT BETWEEN HEAVY BED OF YELLOW CHERT AND THIN-BEDDED CHERTS AND SHALES. ORE CONSISTS OF HAUSMANNITE INTIMATELY ASSOCIATED WITH LIGHT BROWN SILICEOUS ORE AND MANGANESE CARBONATE. ONE FAIRLY CONTINUOUS ORE BED STRIKES N 40 TO 70 W, AND DIPS STEEPLY N. THE ORE BED IS 1 TO 4 FT. THICK, AND HAS BEEN DISTURBED BY CROSS FAULTS.

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Large
Significant No

Reference information

Bibliographic references

  • Deposit

    CALIF DOM BULL,152,P 240-241;

  • Deposit

    D.O.M. BULL. 125 1943 P. 171

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JAN-1978 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.