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Monarch - Sugar Loaf

Past Producer in El Dorado county in California, United States with commodities Gold, Copper, Zinc, 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. Host and associated rocks
  9. Nearby scientific data
  10. Ore body information
  11. Economic information about the deposit and operations
  12. Workings at the site
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10006917
MRDS ID C007726
Record type Site
Current site name Monarch - Sugar Loaf
Related records 10284562

Geographic coordinates

Geographic coordinates: -120.8663, 38.60351 (WGS84)
Elevation 488
Relative position 2 1/2 MI NW OF NASHVILLE

Site location context

Political divisions (FIPS codes)

El Dorado(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Fiddletown(quadrangle 1:24,000 scale)

Placerville(quadrangle 1:100,000 scale)

Sacramento(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Cosumnes(hydrologic unit)

San Joaquin(hydrologic accounting unit)

San Joaquin(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California El Dorado

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 009N 010E 27 California

Comments on the location information

  • UTM ACC SE 1/4 NW 1/4 NE 1/4 SW 1/4

Commodities

Commodity Importance
Gold Primary
Copper Tertiary
Zinc Critical Tertiary
Lead Tertiary

Comments on the commodity information

  • SOME HIGH GRADE ORE FORM POCKETS IN 1955 , NEAR SURFACE

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Gold Ore
Pyrite Ore
Sphalerite Ore
Quartz Gangue

Analytical data

Result SULFIDE CONCENTRATION INCREASES WITH DEPTH

Host and associated rocks

  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
    Stratigraphic age (youngest) Late Jurassic

Nearby scientific data

(1) -120.8663, 38.60351
ListMap

Economic information

Ore body information

  • Strike NNW
    Dip 0
    Depth to top 0M

Comments on the geologic information

  • VEIN IN FINE GRAINED ANDESITE OF LOGTOWN RIDGE FMN OF UPPER JURASSIC AGE

Economic information about the deposit and operations

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

Comments on the production information

  • NO PRODUCTION RECORD FOUND, ORIGINALLY WORKED IN 1850'S, 1870 - 1907 PROSPECTED 1930'S, 1953 - 54

Workings at the site

  • Type of workings Surface/Underground
    Area 7.455HA

Comments on the workings information

  • DEVELOPED BY OPEN CUTS, AND SHALLOW SHAFTS FOR APPROX 2000 FT ALONG STRIKE. 70 FT CROSSCUT ADIT MOST RECENT DEVELOPMENT

Reference information

Bibliographic references

  • Deposit

    CLARK, W. B., AND CARLSON, D. W., 1956 , MINES AND MINERAL RESOURCES OF EL DORADO CO., CALIF.: CALIF. JOUR. OF MINES AND GEOL., VOL. 52 , NO. 4 , PG 419 - 420 , 518 AND PL 10

General comments

Subject category Comment text
Deposit VEIN, STRIKE N TO NW, FLAT DIP

Reporter information

Type Date Name Affiliation Comment
Reporter 01-FEB-1979 Mateik, R.; 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.