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Gravelly Valley

Producer in Lake 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. Nearby scientific data
  8. Economic information about the deposit and operations
  9. Ownership information
  10. Links to other databases
  11. Bibliographic references
  12. General comments
  13. Reporter information

Geologic information

Identification information

Deposit ID 10030712
MRDS ID M009042
Record type Site
Current site name Gravelly Valley
Related records 10139161

Geographic coordinates

Geographic coordinates: -122.97303, 39.44487 (WGS84)
Relative position EASTERN SLOPE OF ERICSON RIDGE. MINE INC. 35 MI. FROM UKIAH

Site location context

Political divisions (FIPS codes)

Lake(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Lake Pillsbury(quadrangle 1:24,000 scale)

Lakeport(quadrangle 1:100,000 scale)

Ukiah(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Eel(hydrologic unit)

Northern California Coastal(hydrologic accounting unit)

Klamath-Northern California Coastal(hydrologic subregion)

California(hydrologic region)

Federal lands

Mendocino National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States California Lake

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 018N 010W 03 California

Commodities

Commodity Importance
Manganese Critical Primary

Analytical data

Result PRIMARY ORE GRADE 20 TO 30 PERCENT MANGANESE.

Nearby scientific data

(1) -122.97303, 39.44487
ListMap

Economic information

Comments on the geologic information

  • GEOL.DESC: MANGANIFEROUS BEDS ORIGINALLY IN THE CHERTS HAVE BEEN DEFORMED BY SMALL SCALE FAULTING, AND WERE MADE SUSEPTIBLE TO LEECHING AND OXIDIZING. FRIABLE MANGANESE OXIDE ORES ARE FOUND IN BRECCIATED ZONES, FROM PRIMARY MATERIAL THAT WAS PROBABLY MANGANIFEROUS CHERT, HYDROUS MANGANESE SILICATES, OR DISSEMINATED MANGANESE CARBONATE.

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Small
Significant No

Ownership information

  • Type Operator
    Owner Ed George And Others; Tex Young

Comments on the production information

  • THIS IS THE ONLY MANGANESE MINE IN LAKE COUNTY THAT HAS PRODUCED DURING THE WAR PERIOD. ABOUT 1943, SEVERAL CARLOADS OF MANGANESE ORE WERE SOLD. THE PROPERTY WAS IDLE IN 1945. ORE SHIPMENTS FROM THIS PROPERTY BEGUN IN 1955 AND PROSPECTING AND MINING WERE BEING CONTINUED IN 1958.

Comments on the workings information

  • IN 1958 AN EXTENSIVE OPEN CUT WHICH INCLUDES 5 BENCHES OF IRREGULAR EXTENT.

Reference information

Bibliographic references

  • Deposit

    CALIF. JOUR., VOL. 43, NO. 1, JAN. 1947, PP. 21-22

  • Deposit

    CALIF. BULL.152, P. 91

  • Deposit

    MIN. INF. SERVICE V. 11, NO. 11, P. 9; ADD. REF.: USBM RI 5579, P. 7-8

General comments

Subject category Comment text
Deposit FIVE MINERALIZED ZONES, 1500' ALONG STRIKE N 60 DEG W, MN OCCURS IN VUGGY ROCK IN CHERT AND SANDSTONE BEDS.

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.