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  3. Mineral Resource Data System (MRDS)

Ladd Mine

Past Producer in Siskiyou county in California, United States with commodity Chromium
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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. Workings at the site
  16. Links to other databases
  17. Bibliographic references
  18. Reporter information

Geologic information

Identification information

Deposit ID 10238502
MAS/MILS ID 0060931368
Record type Site
Current site name Ladd Mine
Alternate or previous names Klamath Chrome Mine, Dolbear Mine, Chromite Group, Klamath Chrome

Geographic coordinates

Point of reference Main Entrance
Geographic coordinates: -123.12173, 41.82093 (WGS84)
Elevation 732
Location accuracy 500(meters)

Site location context

Political divisions (FIPS codes)

Siskiyou(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Hamburg(quadrangle 1:24,000 scale)

Happy Camp(quadrangle 1:100,000 scale)

Weed(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Klamath(hydrologic unit)

Klamath(hydrologic accounting unit)

Klamath-Northern California Coastal(hydrologic subregion)

California(hydrologic region)

Federal lands

Klamath National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States California Siskiyou

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 046 N 011 W 21 SWNENE California

Commodities

Commodity Importance
Chromium Critical Tertiary

Materials information

Materials Type of material
Chromite Unknown
Olivine Unknown
Pyroxene Unknown
Serpentine Unknown

Nearby scientific data

Main Entrance (1) -123.12173, 41.82093
ListMap

Economic information

Ore body information

  • Strike N20W
    Dip 90E
    Thickness 3M
    Length 18M
    Width 26M
    Area 3HA
    Depth to top 0M
    Field Value
    Type of Orebody #1 DISSEMINATED
    Shape of Orebody #1 TABULAR
    Shape of Orebody #2 IRREGULAR
    Shape of Orebody #3 LENTICULAR
    Primary mode of Origin MAGMATIC DIFFER
    Primary Ore Control LITHOLOGY
    Degree of Wallrock Alter. INTENSE
    Type of Wallrock Alter. #1 CARBONITIZATION
    Strike And Dip N20W:90E
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. 0
    Min. Thick. Unconsol. Mat. 0
    Total Surface Area (HA) 3
    Date of Last Modification 830316

Economic information about the deposit and operations

Operation type Surface-Underground
Development status Past Producer
Commodity type Metallic
Significant No
Discovery year 1912
Year of first production 1918

Mining district

District name Seiad-Mcguffy

Mineral rights holdings

Type of mineral rights Other

Land status

Ownership category National Forest

Ownership information

  • Type Owner
    Owner American Chromium
    Interest 50
    Home office Oregon
    Year 1985
  • Type Operator
    Owner Asamera Minerals (U. S.), Inc.
    Interest 50
    Home office Nevada
    Year 1985

Workings at the site

  • Type of workings Underground
    Length 2100M
    Overall depth 0M
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method PROPOSED
    Mining Method OPEN STOPE
    Swell Factor .6
    Percent Waste Rock 0
    Percent Recovery 100
    Hardness of Rock HARDROCK WITH LITTLE WATER
    Rock Characteristics MULTIPLE SYSTEMS OF WEAKNESS PLANES
    Rock Support Chars. UNKNOWN
    Mine Support Chars. POST, HEADBOARD, CAPS, ROOF BOLTS
    Length of Inclines (m) 0
    Avg. Length of Adits (m) 350
    Number of Adits 6
    1st Condition of Workings UNKNOWN
    Capacity 500
    Capacity Units MT ORE/DAY
    Unit Production Cost 14.47
    Units of Production $/MT ORE
    Operating Days per Year 260
    Operating Shifts per Day 2
    Year of Information 1985

Reference information

Bibliographic references

  • Deposit

    WELLS,FG ET AL,1949.CR-SEIAD&MCGUFFY CK,USGS BULL 948-B,P52-

  • Deposit

    OBRIEN,J.C. 1947 CAL.JOUR MINES & GEOL,V 43,NO 4, P 422

  • Deposit

    BRADLEY,W W,1918 CAL ST MINING BUREAU BULL 76, P 193-194

Reporter information

Type Date Name Affiliation Comment
Reporter 13-JAN-1986 Wetzel, Nicholas 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.