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  3. Mineral Resource Data System (MRDS)

Yuba County Gold Company

Plant in Yuba county in California, United States with commodities Gold, Silver
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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. Nearby scientific data
  9. Ore body information
  10. Economic information about the deposit and operations
  11. Mining district
  12. Mineral rights holdings
  13. Land status
  14. Ownership information
  15. Production statistics
  16. Reserves and resources
  17. Workings at the site
  18. Links to other databases
  19. Bibliographic references
  20. Reporter information

Geologic information

Identification information

Deposit ID 10117103
MAS/MILS ID 0061150168
Record type Site
Current site name Yuba County Gold Company
Alternate or previous names Yuba Placer Gold Company

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: -121.43934, 39.18518 (WGS84)
Elevation 46
Location accuracy 500(meters)

Site location context

Political divisions (FIPS codes)

Yuba(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Browns Valley(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 Yuba

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 015 N 005 E 04 N2 California

Commodities

Commodity Importance
Gold Primary
Silver Tertiary

Materials information

Materials Type of material
Gold Unknown
Silver Unknown

Nearby scientific data

Ore Body (1) -121.43934, 39.18518
ListMap

Economic information

Ore body information

  • Thickness 18M
    Depth to top 24M
    Field Value
    MAS Matrix # 1
    MAS Column # 1
    Type of Orebody #1 PLACER
    Shape of Orebody #1 IRREGULAR
    Primary mode of Origin SEDIMENTATION
    Primary Ore Control LITHOLOGY
    Degree of Wallrock Alter. NONE
    Avg. Thick. Unconsol. Mat. 24
    Date of Last Modification 860619
  • Area 810HA
    Field Value
    Total Surface Area (HA) 810
    Date of Last Modification 910418

Economic information about the deposit and operations

Operation type Surface
Development status Plant
Commodity type Metallic
Significant No
Discovery year 1903
Year of first production 1903
Plant type Beneficiation (Mill)
Plant subcategory Gravity

Mining district

District name Yuba River District

Mineral rights holdings

Type of mineral rights Unknown

Land status

Ownership category Unknown

Ownership information

  • Type Owner-Operator
    Owner St. Joe Gold
    Interest 67
    Year 1986
  • Type Owner
    Owner Yuba Natural Resources Corp
    Interest 33
    Year 1983

Comments on the ownership information

  • YUBA PLACER GOLD COMPANY IS A JOINT VENTURE BETWEEN PLACER SERVICE CORP., A WHOLELY OWNED SUBSIDIARY OF THE ST. JOE MINERALS CORP., WHICH IS A SUBSIDIARY OF FLUOR CORP., AND YUBA NATURAL RESOURCES, INC.

Production statistics

  • Year 1968
    Period 1904-1968
    Description Between 1904-1968 Over 1 Billion Cubic Yards Of Sand And Gravel Were Excavated 4800000 Oz Gold (1904-1968)
  • Year 1983
    Description Gold Produced 353 Kilograms
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 3535000g
  • Year 1983
    Description Ore Processed 1999000 Cubic Meterss
  • Year 1984
    Description Total Material Mined 2959000 Cubic Meters
  • Year 1984
    Description Gold Produced 476 Kilograms
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 476000g
  • Year 1984
    Description Ore Processed 2214000 Cubic Meters
  • Year 1985
    Description Gold Produced 707 Kilograms
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 707000g
  • Year 1985
    Description Ore Processed 2398000 Cubic Meters
  • Year 1985
    Description Total Material Mined 3905000 Cubic Meters
  • Year 1986
    Description Gold Produced 600 Kilograms
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 600000g
  • Year 1986
    Description Ore Processed 2277000 Cubic Meters
  • Year 1986
    Description Total Material Mined 4079000 Cubic Meters

Reserves and resources

  • Type In-situ
    Estimate year 1987
    Inferred 47600000mt ore
    Total resources 47600000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 0.2639 g/mt Gold Major 1987

Comments on the reserve resource information

  • INSITU RESERVES ARE ESTIMATED AT 68,462,000 METRIC TONNES OF ORE AT A GRADE OF 0.136 GM AU/MT AND 0.012 GM AG/MT. RECOV- ERABLE INDICATED TONNES ARE ESTIMATED TO BE THE SAME AS THE IN-SITU TONNES. THERE IS NO MINE DILUTION FACTOR, PER SE, IN A DREDGING OPERATION. MATRIX 1 COLUMN 3 DENOTES COMPANY RESOURCE ESTIMATES FOR THE DEPOSIT AS OF 1986. MATRIX 1 COLUMN 5 DENOTES COMPANY RESOURCE ESTIMATES FOR THE DEPOSIT AS OF 1987.

Workings at the site

  • Type of workings Surface
    Area 810HA
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method ESTIMATE
    Mining Method DREDGING
    Avg. Overburden Thickness 24
    Primary Material Cover SAND, GRAVEL
    Percentage 0
    Hardness of Ore SAND, GRAVEL
    Capacity 17450
    Capacity Units MT ORE/DAY
    Unit Production Cost .34
    Units of Production $/MT ORE
    Operating Days per Year 365
    Operating Shifts per Day 3
    Year of Information 1983

Comments on other economic factors

  • DURING 1980 AND 1981, THE YUBA PLACER GOLD COMPANY RENOVATED AND REBUILT THE OLD YUBA DREDGE NO. 21. THE MOST MAJOR MODIFICATION WAS THE EXTENSION OF THE BUCKET LINE AND DIGGING LADDER, THUS ENABLING THE DREDGE TO DIG TO 140 FT BELOW THE WATER LEVEL INSTEAD OF THE PREVIOUS 107 FT. THE SECOND DEVELOPMENT PLAN CALLS FOR PRELIMINAY ENGINEERING WORK FOR RENOVATION AND RECONSTRUCTION OF DREDGE NO. 17 DURING 1984. ACTUAL CONSTRUCTION WORK IS SCHEDULED FOR 1985-1986. AROUND MID-1986, IT SHOULD BE READY FOR COMMISSIONING. IT WILL BE ABLE TO DIG TO DEPTHS OF 175 FT, ALLOWING MOST TRACK AREAS TO BE MINED TO BEDROCK, RECOVERING MOST OF THE HIGH GRADE PART OF THE DEPOSIT. THE SECOND DREDGE IS EXPECTED TO DOUBLE ANNUAL CAPACITY AND THE GOLD AND SILVER OUTPUT.

Reference information

Bibliographic references

  • Deposit

    MORRISON-KNUDSON COMPANY, INC.-MINING GROUP. MINE DEPOSIT

  • Deposit

    FILE REPORT, YUBA PLACER GOLD COMPANY, PLACER SERVICE CORP.

  • Deposit

    YUBA COUNTY, CALIFORNIA. DRAFT REPORT, USBM CONTRACT NO.

  • Deposit

    S0221028, SEPT 1983.

  • Deposit

    USBM HEAVY METALS PROGRAM, SITUATION REPORT. HAMMONTON GOLD

  • Deposit

    DREDGING OPERATION, YUBA COUNTY, CALIFORNIA, MAY, 1968.

  • Deposit

    ENGINEERING AND MINING JOURNAL. CALIFORNIA-GOLD DREDGING

  • Deposit

    MAY BE RESUMED. DEC. 1979, P. 126.

  • Deposit

    MINING CONGRESS JOURNAL. RESUMPTION OF DREDGING FOR GOLD.

  • Deposit

    MAY 1980, P. 6.

  • Deposit

    ENGINEERING AND MINING JOURNAL. CALIFORNIA-A GOLD DREDGING

  • Deposit

    JOINT VENTURE. MAY 1980, P. 162.

  • Deposit

    ENGINEERING AND MINING JOURNAL. CALIFORNIA-PLACER SERVICE

  • Deposit

    CORP. NOV. 1980., P. 234.

  • Deposit

    MINING CONGRESS JOURNAL. GOLD DREDGING ACTIVITIES OF PLACER

  • Deposit

    SERVICE CORP. NOV. 1980.

  • Deposit

    ENGINEERING AND MINING JOURNAL. A DISPUTE-YUBA GOLD FIELDS

  • Deposit

    AND THE ARMY CORPS. OF ENGINEERS. AUG. 1981, P. 13.

  • Deposit

    ENGINEERING AND MINING JOURNAL. CALIFORNIA-SUMMARY JUDGEMENT

  • Deposit

    WILL BE GRANTED. SEPT. 1981, PP. 247, 251.

  • Deposit

    SKILLING'S MINING REVIEW. APR. 17, 1982, P. 13.

  • Deposit

    FLUOR CORPORATION, 1981 ANNUAL REPORT.

  • Deposit

    ST. JOE MINERALS COMPANY, 1980 ANNUAL REPORT.

Reporter information

Type Date Name Affiliation Comment
Reporter 30-DEC-96 Avery, D.W. U.S. Bureau of Mines

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.