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Harvard Mine

Occurrence in Tuolumne 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. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10165658
MRDS ID W026030
MAS/MILS ID 0061090562
Record type Site
Current site name Harvard Mine
Alternate or previous names Sonora Gold, Hitchcock, Part of the Jamestown Group/Mine, Alabama, Trio, Mooney, Sweeney, Heslep, Golden Rule, New Era
Related records 10077946, 10238351

Geographic coordinates

Point of reference Main Entrance
Geographic coordinates: -120.4382, 37.94552 (WGS84)
Elevation 474
Location accuracy 100(meters)

Site location context

Political divisions (FIPS codes)

Tuolumne(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Sonora(quadrangle 1:24,000 scale)

Oakdale(quadrangle 1:100,000 scale)

San Jose(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Tuolumne(hydrologic unit)

San Joaquin(hydrologic accounting unit)

San Joaquin(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California Tuolumne

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 001 N 014 E 16 SENWNW California

Commodities

Commodity Importance
Gold Primary
Silver Primary

Materials information

Materials Type of material
Gold Unknown
Pyrite Unknown
Silver Unknown

Nearby scientific data

Main Entrance (1) -120.4382, 37.94552
ListMap

Economic information

Ore body information

  • Strike N37W
    Dip 60E
    Thickness 60M
    Length 490M
    Width 560M
    Area 202HA
    Depth to top 6M
    Field Value
    MAS Matrix # 1
    MAS Column # 2
    Type of Orebody #1 FISSURE VEIN
    Shape of Orebody #1 TABULAR
    Type of Orebody #2 DISSEMINATED
    Primary mode of Origin HYDROTHERMAL
    Secondary mode of Origin OXIDATION
    Primary Ore Control FRACTURING
    Secondary Ore Control CONTACT ZONE
    Degree of Wallrock Alter. INTENSE
    Type of Wallrock Alter. #1 CARBONATE SILIC
    Type of Wallrock Alter. #2 DOLOMITIZATION
    Type of Wallrock Alter. #3 SILICIFICATION
    Strike And Dip N37W:60E
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. 6
    Min. Thick. Unconsol. Mat. 0
    Total Surface Area (HA) 202
    Date of Last Modification 950407
  • Strike N30W
    Dip 65E
    Thickness 110M
    Length 500M
    Width 73M
    Depth to top 6M
    Field Value
    MAS Matrix # 1
    MAS Column # 3
    Type of Orebody #1 FISSURE VEIN
    Shape of Orebody #1 TABULAR
    Type of Orebody #2 DISSEMINATED
    Primary mode of Origin HYDROTHERMAL
    Secondary mode of Origin OXIDATION
    Primary Ore Control FRACTURING
    Secondary Ore Control CONTACT ZONE
    Degree of Wallrock Alter. INTENSE
    Type of Wallrock Alter. #1 CARBONATE SILIC
    Type of Wallrock Alter. #2 DOLOMITIZATION
    Type of Wallrock Alter. #3 SILICIFICATION
    Strike And Dip N30W:65E
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. 6
    Min. Thick. Unconsol. Mat. 0
    Date of Last Modification 840910
  • Strike N37W
    Dip 60E
    Thickness 75M
    Length 670M
    Width 70M
    Depth to top 6M
    Field Value
    MAS Matrix # 1
    MAS Column # 4
    Type of Orebody #1 FISSURE VEIN
    Shape of Orebody #1 TABULAR
    Type of Orebody #2 DISSEMINATED
    Primary mode of Origin HYDROTHERMAL
    Secondary mode of Origin OXIDATION
    Primary Ore Control FRACTURING
    Secondary Ore Control CONTACT ZONE
    Degree of Wallrock Alter. INTENSE
    Type of Wallrock Alter. #1 CARBONATE SILIC
    Type of Wallrock Alter. #2 DOLOMITIZATION
    Type of Wallrock Alter. #3 SILICIFICATION
    Strike And Dip N40W:60E
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. 6
    Min. Thick. Unconsol. Mat. 0
    Date of Last Modification 840918
  • Strike N16W
    Dip 70E
    Thickness 100M
    Length 440M
    Width 95M
    Depth to top 6M
    Field Value
    MAS Matrix # 1
    MAS Column # 6
    Type of Orebody #1 FISSURE VEIN
    Shape of Orebody #1 TABULAR
    Type of Orebody #2 DISSEMINATED
    Primary mode of Origin HYDROTHERMAL
    Secondary mode of Origin OXIDATION
    Primary Ore Control FRACTURING
    Secondary Ore Control CONTACT ZONE
    Degree of Wallrock Alter. INTENSE
    Type of Wallrock Alter. #1 CARBONATE SILIC
    Type of Wallrock Alter. #2 DOLOMITIZATION
    Type of Wallrock Alter. #3 SILICIFICATION
    Strike And Dip N16W:70E
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. 6
    Min. Thick. Unconsol. Mat. 0
    Date of Last Modification 840910
  • Strike N30W
    Dip 62E
    Thickness 24M
    Length 460M
    Width 550M
    Depth to top 6M
    Field Value
    MAS Matrix # 1
    MAS Column # 7
    Type of Orebody #1 FISSURE VEIN
    Shape of Orebody #1 TABULAR
    Type of Orebody #2 DISSEMINATED
    Primary mode of Origin HYDROTHERMAL
    Secondary mode of Origin OXIDATION
    Primary Ore Control FRACTURING
    Secondary Ore Control CONTACT ZONE
    Degree of Wallrock Alter. INTENSE
    Type of Wallrock Alter. #1 CARBONATE SILIC
    Type of Wallrock Alter. #2 DOLOMITIZATION
    Type of Wallrock Alter. #3 SILICIFICATION
    Strike And Dip N30W:62E
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. 6
    Min. Thick. Unconsol. Mat. 0
    Date of Last Modification 840910

Economic information about the deposit and operations

Operation type Underground
Development status Occurrence
Commodity type Metallic
Deposit size Medium
Significant No
Discovery year 1848
Year of first production 1891
Milling method Flotation

Mining district

District name Jamestown Area

Mineral rights holdings

Type of mineral rights Private Lease
Type of mineral rights Fee Ownership
Type of mineral rights Minerals Only

Land status

Ownership category Mixed

Ownership information

  • Type Owner-Operator
    Owner Sonora Gold Mining Corp.
    Interest 70
    Home office Canada
    Year 1989
  • Type Owner
    Owner Pathfinder Gold Corp.
    Interest 30
    Home office Nevada
    Year 1989

Production statistics

  • Year 1891
    Description Ounces Of Gold 4995760 Ounces Of Gold
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 155385526.24g

Reserves and resources

  • Type In-situ
    Estimate year 1984
    Measured 22464000mt ore
    Indicated 22464000mt ore
    Demonstrated 44928000mt ore
    Total resources 44928000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 2.2299 g/mt Gold Major 1984
    Silver Ag 2.6799 g/mt Silver Major 1984
  • Type In-situ
    Estimate year 0
    Inferred 34164000mt ore
    Total resources 34164000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 3.06 g/mt Gold Major 0
    Silver Ag 3.67 g/mt Silver Major 0
  • Type In-situ
    Estimate year 1986
    Measured 12949000mt ore
    Indicated 3556200mt ore
    Demonstrated 16505200mt ore
    Total resources 16505200mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 2.515 g/mt Gold Major 1986

Workings at the site

  • Type of workings Surface
    Area 202HA
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method PROPOSED
    Mining Method OPEN PIT
    Swell Factor .6
    Percent Waste Rock 81.8
    Avg. Overburden Thickness 6
    Primary Material Cover SAND, GRAVEL
    Hardness of Ore M-HARD ROCKS
    Avg. Bench Height (meters) 6
    Max. Pit Slope (degrees) 45
    Capacity 6349
    Capacity Units MT ORE/DAY
    Preprod. Stripping Vol. 194.8
    Unit Production Cost 5.82
    Units of Production $/MT ORE
    Operating Days per Year 360
    Operating Shifts per Day 3
    Year of Information 1989

Comments on the workings information

  • THE MOST SIGNIFICANT ENVIRONMENTAL IMPACT SHOULD BE THE OPEN PITS AND SHORT TERM AFFECTS OF NOISE.

Reference information

Bibliographic references

  • Reserve-Resource

    INTERNATIONAL MINING, 9/86, PP24-26.

  • Deposit

    CALIF. JOUR. MINES AND GEOL., V. 45, 1949, P. 18.

  • Deposit

    ALLGOOD, G. M. MINE GEOLOGIST, SONORA GOLD CORPORATION.

  • Deposit

    PERSONAL COMMUNICATION, 1984.

  • Deposit

    ALLGOOD, J. MILL MANAGER, SONORA GOLD CORPORATION. PERSONAL

  • Deposit

    COMMUNCATION, 1984.

  • Deposit

    CAMP, DRESSER, AND MCKEE, INC. CALIFORNIA GOLD PROJECT

  • Deposit

    DRAFT ENVIRONMENTAL IMPACT REPORT. OCT. 1983.

  • Deposit

    ---. CALIFORNIA GOLD PROJECT FINAL IMPACT REPORT. JAN. 1984.

  • Deposit

    CLARK, W. B. GOLD DISTRICTS OF CALIFORIA. CA DIV. MINES AND

  • Deposit

    GEOL. BULL. 193, 1970.

  • Deposit

    DOHMS, P. H., R. D. HOAGLAND, AND G. M. ALLGOOD. GEOLOGY OF

  • Deposit

    THE JAMESTOWN MINE AREA MOTHER LODE GOLD BELT, TUOLUMNE

  • Deposit

    COUNTY, CALIFORNIA. PAPER WRITTEN OR THE SOC. ECON. GEOL.

  • Deposit

    FIELD TRIP TO THE MOTHER LODE, MAR. 1-5, 1984.

  • Deposit

    ENGINEERING AND MINING JOURNAL. MARKETS. FEB. 1984, P. 23.

  • Deposit

    HERSHEY, O. H. PRIVATE COMPANY REPORTS ON THE HARVARD MINE

  • Deposit

    ADDRESSED TO ROBERT G. HOOKER, JR., PRESIDENT, HARVARD GOLD

  • Deposit

    MINING AND MILLING COMPANY, SAN FRANCISCO, CA., 1916

  • Deposit

    JULIHN, C. E., AND F. W. HORTON. MINES OF THE SOUTHERN

  • Deposit

    MOTHER LODE REGION, PART II-TUOLUMNE AND MARIPOSA COUNTIES.

  • Deposit

    BUMINES B 424, 1940, 179 PP.

  • Deposit

    KILBORN ENGINEERS. PRIVAGE FEASIBILITY REPORTS PREPARED FOR

  • Deposit

    SONORA GOLD CORPORATION. NOV. 1983, JAN. 1984.

  • Deposit

    KNOPF, A. THE MOTHER LODE SYSTEM OF CALIFORNIA. U.S. GEOL.

  • Deposit

    SURV. PROF. PAPER 157, 1929, 88 PP.

  • Deposit

    LAING AND CRUICKSHANK. REPORT ON SONORA GOLD CORPORATION

  • Deposit

    AND RECOMMENDATION. JUNE 1984.

  • Deposit

    LOGAN, C. A. MOTHER LODE GOLD BELT OF CALIFORNIA. CA

  • Deposit

    J. MINES AND GEOL., V. 45, NO. 1, 1949, P. 68.

  • Deposit

    MOORE, L. GOLD RESOURCES OF THE MOTHER LODE BELT,

  • Deposit

    EL DORADO, AMADOR, CALAVERAS, TUOLUMNE, AND MARIPOSA

  • Deposit

    COUNTIES, CALIFORNIA. BUMINES TECH. PROGRESS REP. NO. 5,

  • Deposit

    1968, P. 15.

  • Deposit

    PAY DIRT (INTERMOUNTAIN). SONORA GOLD SAYS JAMESTOWN PROD-

  • Deposit

    UCTION DUE LATE THIS YEAR. JULY 1984, P. 26A.

  • Deposit

    RICHINS, R. ENVIRONMENTAL ENGINEER, JAMES M. MONTGOMERY

  • Deposit

    CONSULTING ENGINEERS. PERSONAL COMMUNICATION, OCT. 1983.

General comments

Subject category Comment text
Deposit ANOTHER NAME FOR THIS AREA IS THE MOTHER LODE GOLD BELT.

Reporter information

Type Date Name Affiliation Comment
Reporter 30-DEC-1996 Longwill U.S. Bureau of Mines

Beyond USGS

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

External references

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.