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Aho Mine

Producer in Sonoma 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. Economic information about the deposit and operations
  11. Links to other databases
  12. Bibliographic references
  13. Reporter information

Geologic information

Identification information

Deposit ID 10033628
MRDS ID M020238
Record type Site
Current site name Aho Mine
Alternate or previous names Drum
Related records 10238682

Geographic coordinates

Geographic coordinates: -123.1808, 38.53544 (WGS84)
Relative position 7 MI. FROM CAZADERO ON THE ROAD TO FORT ROSS. TOTAL DISTANCE OF 38 MI. TO RAILROAD AT HEALDSBURG.

Site location context

Political divisions (FIPS codes)

Sonoma(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Fort Ross(quadrangle 1:24,000 scale)

Point Arena(quadrangle 1:100,000 scale)

Santa Rosa(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Gualala-Salmon(hydrologic unit)

Northern California Coastal(hydrologic accounting unit)

Klamath-Northern California Coastal(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California Sonoma

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 008N 012W 15,16 California

Comments on the location information

  • LOCATED IN NW 1/4 SW 1/4 SECTION 15 , AND SE 1/4 SECTION 16

Commodities

Commodity Importance
Manganese Critical Primary

Materials information

Materials Type of material
Rhodochrosite Ore

Analytical data

Result AVERAGE GRADE 30 TO 35 PERCENT MANGANESE, AND OVER 25 PERCENT SILICA.

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Sandstone
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Late Cretaceous
  • Host or associated Host
    Rock type Sedimentary Rock > Chemical Sediment > Chert
    Rock unit name Franciscan Complex
    Rock description Franciscan Complex

Nearby scientific data

(1) -123.1808, 38.53544
ListMap

Economic information

Comments on the geologic information

  • ORE HOSTED IN FRANCISCAN COMPLEX-L. TO L. ; GEOL.DESC: 3 SEPARATE ORE BODIES; 2 ENCLOSED IN THIN BEDDED TO MASSIVE RED CHERT, ONE IN A FAULT ZONE BETWEEN CHERT AND SANDSTONE MASS TO THE N. UPPER BODY IS 35 FT. LONG, 10 FT. THICK, STRIKES N. 65 E., AND DIPS 30 TO 40 N. SECOND ORE BODY HAS SAME GENERAL ATTITUDE, IS LENTICULAR, AND LIES 20 FT BELOW THE UPPER BODY. THIRD ORE BODY IS 50 FT. LONG, 1 TO 3 FT. THICK, AND DIPS 55 S., AND IS THE STRATIGRAPHICALLY LOWEST BODY. ALL BODIES HAVE UNDERGONE FAULTING. PRIMARY ORE IS LARGELY SILICATES, PROBABLY NEOTOCITE. SOME RHODOCHROSITE AND BROWN CARBONATE ARE PRESENT. CALCITE VEINS FILL FRACTURES.

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Medium
Significant No

Reference information

Bibliographic references

  • Deposit

    D.O.M. BULL. 152 1950 PP. 280 - 282

  • Deposit

    D.O.M. BULL. 125 1943 P. 186

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.