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San Juan Mine

Plant in Nevada county in California, United States with commodity Gold
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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. Mineral rights holdings
  10. Land status
  11. Ownership information
  12. Production statistics
  13. Reserves and resources
  14. Links to other databases
  15. Bibliographic references
  16. General comments
  17. Reporter information

Geologic information

Identification information

Deposit ID 10261946
MRDS ID W017610
MAS/MILS ID 0060570083
Record type Site
Current site name San Juan Mine
Alternate or previous names San Juan Rigde Mine, San Juan Ridge
Related records 10072366

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: -121.98966, 39.36378 (WGS84)
Elevation 1335
Location accuracy 1000(meters)

Site location context

Political divisions (FIPS codes)

Colusa(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Sanborn Slough(quadrangle 1:24,000 scale)

Yuba City(quadrangle 1:100,000 scale)

Chico(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Lower Sacramento(hydrologic accounting unit)

Sacramento(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California Nevada

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 017 N 011 E 16 S2 California

Comments on the location information

  • MILS LAT/LONG IS NOT CONSISTANT WITH THE NAP NAME GIVEN (BLUE CANYON 7.5 MIN TOPO SHEET).

Commodities

Commodity Importance
Gold Primary

Nearby scientific data

Ore Body (1) Quaternary alluvium and marine deposits
ListMap

Economic information

Economic information about the deposit and operations

Operation type Placer
Development status Plant
Commodity type Metallic
Deposit size Small
Significant Yes
Mining method Open Stope - Room and Pillar
Year of first production 1996
Plant type Beneficiation (Mill)
Milling method Gravity

Mineral rights holdings

Type of mineral rights Patented

Land status

Ownership category National Forest

Ownership information

  • Type Owner-Operator
    Owner Siskon Gold Corp.
    ID 0405217
    Interest 100
    Home office California
    Year 1996
    First year 1992
  • Type Owner
    Owner Siskon Gold Corp.
    Interest 30
    Home office California
    Year 1997
    First year 1985
    Last year 1992
  • Type Owner-Operator
    Owner Battle Mountain Gold Co.
    Interest 70
    Home office Texas
    First year 1985
    Last year 1992
  • Type Owner-Operator
    Owner Battle Mountain Gold Co.
    Interest 100
    Home office Texas
    Last year 1985

Production statistics

  • Year 1994
    Description Gold Production (Est) 40000 Tr Oz/Yr Gold
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 1244139.24g
  • Year 1995
    Description Gold Production 25000 Tr Oz/Yr Gold
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 777587.02g
  • Year 1996
    Description Gold Production; First 1/2 1996 (Est) 7000 Tr Oz Gold
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 217724.36g
  • Year 1996
    Description Ore Mined 145611 St Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 160508.6mt
  • Year 1996
    Description Gold Production 9651 Tr Oz/Yr
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 300179.69g

Comments on the production information

  • ESTIMATED PRODUCTION IS 30,000-40,000 OPY (1995). OVER 7000 OZ AU WAS PRODUCED DURING THE FIRST HALF OF 1996.

Reserves and resources

  • Type In-situ
    Estimate year 1990
    Indicated 3916451mt ore
    Demonstrated 3916451mt ore
    Total resources 3916451mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 0.928 g/mt Gold Major 1990
  • Type In-situ
    Estimate year 1996
    Demonstrated 27585000mt ore
    Total resources 27585000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 0.63 g/mt Gold Major 1996
  • Type In-situ
    Estimate year 1997
    Demonstrated 2880000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 3.15 g/mt Gold Major 1997

Comments on the reserve resource information

  • EQUIVALENT TO 16.4 M CU YDS AU BEARING MATERIAL, 0.034OZ/T AU. DATA ON 1996 RESERVES COULD NOT BE LOCATED, NOT REPORTED IN THE COMPANIES 1996 ANNUAL REPORTS:
  • THE 257,707 OZ AU (1996/97 RANDOL MINING DIRECTORY), WAS CONVERTED FROM OZ/CUBIC YARD TO G/MT USING A SPECIFIC GRAVITY OF 2.2

Reference information

Bibliographic references

  • Production

    COMAPNIES, P166.

  • Production

    MINING ENGINEERING. "SAN JUAN RIDGE GOLD MINE BEGINS

  • Production

    PRODUCTION". 12/96. PP.26-31.

  • Reserve-Resource

    RANDOL MINING DIRECTORY, 1994/95, U.S. MINES AND MINING

  • Reserve-Resource

    COMPANIES, P238.

  • Reserve-Resource

    SISKON GOLD CORPORATION, 1996 ANNUAL & FORM 10-SKB REPORT,

  • Reserve-Resource

    PP. 6, 7.

  • Deposit

    U.S. BUREAU OF MINES TECHNICAL PROGRESS REPORT #3, 12/67,

  • Deposit

    "THE GOLD RESOURCES IN THE TERIARY GRAVELS OF CALIFORNIA".

  • Deposit

    U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 772, P. 21-28.

  • Deposit

    RANDOL MINING DIRECTORY, 1990 AND 1994.

  • Deposit

    MINING JOURNAL, MAR. 13, 1992, VOL. 318, NO. 8164, P. 193.

  • Deposit

    MINING RECORD, V105 N47, 11-23-94, P.1.

  • Deposit

    MINING RECORD, V106 N6, 2-8-95, P.3.

  • Deposit

    MINING RECORD, V106 N11, 3-15-95, P.3.

  • Deposit

    MINING RECORD, V107 N32, 8-7-96, P.1.

  • Deposit

    THE MINING RECORD, V 105, #15, 04/13/94, PP. 1, 4.

  • Deposit

    RANDOL MINING DIRECTORY, 1996/97, U.S. MINES AND MINING

  • Deposit

    COMPANIES, P166.

  • Deposit

    AMERICAN MINES HANDBOOK, 1996, P218.

  • Deposit

    THE MINING RECORD, VOL. 107, #32, P1.

General comments

Subject category Comment text
Deposit UNTIL 1886 MINE OPERATED AS AN OPEN PIT MINE.

Reporter information

Type Date Name Affiliation Comment
Reporter 14-OCT-97 Buckingham, David A. U.S. Bureau of Mines

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Current status (per MSHA)

StatusAbandoned since 08/15/1997
MSHA mine ID0405217
Mine name (MSHA)SAN JUAN RIDGE MINE
Current operatorSiskon Gold Corp
Current controller (parent)Centurion Gold Ltd & U S Precious Metals Inc
Mine typeUnderground (Metal / non-metal)

MSHA cross-reference per the original MRDS record. Mine status and operator reflect MSHA's last published Mines export (February 2025); MSHA's public bulk feed has been unavailable since, so this may be out of date. See the Mine Data Retrieval System for current status.

Open MSHA's Mine Data Retrieval System for inspections, accidents, and violations for this mine.

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.