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J.M. Macdonough Ranch

Past Producer in San Mateo county in California, United States with commodities Gold, Silver, Lead
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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. Alteration
  9. Host and associated rocks
  10. Nearby scientific data
  11. Ore body information
  12. Economic information about the deposit and operations
  13. Land status
  14. Links to other databases
  15. Bibliographic references
  16. General comments
  17. Reporter information

Geologic information

Identification information

Deposit ID 10103217
MRDS ID M022308
Record type Site
Current site name J.M. Macdonough Ranch
Related records 10214033

Geographic coordinates

Geographic coordinates: -122.23576, 37.39269 (WGS84)
Elevation 143
Relative position 1/2 MI. SSE SEARSVILLE LAKE

Site location context

Political divisions (FIPS codes)

San Mateo(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Palo Alto(quadrangle 1:24,000 scale)

Palo Alto(quadrangle 1:100,000 scale)

San Francisco(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Coyote(hydrologic unit)

San Francisco Bay(hydrologic accounting unit)

San Francisco Bay(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California San Mateo

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 006S 003W 19 California

Comments on the location information

  • UTM EST. LAND UNSURVEYED FOR TOWNSHIP-RANGE AND SECTION. EST. FROM TOPO.

Commodities

Commodity Importance
Gold Primary
Silver Secondary
Lead Tertiary

Materials information

Materials Type of material
Gold Ore

Alteration

  • (Local) Oxidation

Analytical data

Result SAMPLES ASSAYED 0.03 OZ AU/TON, 1.10 OZ AG/TON AND 0.8% PB

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Serpentinite
    Stratigraphic age (youngest) Late Jurassic
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Sandstone

Nearby scientific data

(1) -122.23576, 37.39269
ListMap

Economic information

Ore body information

  • Thickness 0.76M

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No

Land status

Ownership category Private

Comments on the workings information

  • PITS AND TRENCHES.

Reference information

Bibliographic references

  • Deposit

    DAVIS, F.F., 1955, MINES AND MINERAL RESOURCES OF SAN MATEO COUNTY, CALIF.: CALIF. JOUR. MINES & GEOLOGY V. 51, NO. 4, P. 413

General comments

Subject category Comment text
Deposit VEIN, 30 IN. THICK. OUTCROPS ON STANFORD ESTATE TO SOUTH OCCURS IN BRECCIATED ZONE OF THE SAN ANDREAS FAULT ZONE CONSISTING OF SERPENTINE. WALL ROCKS ARE JASPER & SANDSTONE.
Deposit WORKED OCCASIONALLY FROM EARLY 1870'S TO AROUND 1915. INVESTIGATIONS AROUND 1955 PROVED IT TO BE OF NO COMMERCIAL VALUE ; INFO.SRC : 1 PUB LIT

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JAN-1980 Nelson, Scott C. (Albers, John, P.) 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.