Butler Estate Mine

Past Producer in Fresno county in California, United States with commodities Chromium, Iron

Geologic information

Identification information

Deposit ID 10139429
MRDS ID M100121
MAS/MILS ID 0060190009
Record type Site
Current site name Butler Estate Mine
Alternate or previous names Mistake, James-Thickston
Related records 10043384

Geographic coordinates

Point of reference Trench
Geographic coordinates: -120.53428, 36.30825 (WGS84)
Elevation 1158
Location accuracy 100(meters)
(click for info)

Geographic areas

Country State County
United States California Fresno

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 019 S 013 E 02 California

Commodities

Commodity Importance
Chromium Primary
Iron Tertiary

Materials information

Materials Type of material
Antigorite Unknown
Calcite Unknown
Chromite Unknown
Magnesite Unknown
Ruby Unknown
Talc Unknown
Uvarovite Unknown

Nearby scientific data

Trench (1) -120.53428, 36.30825

Ore body information

  • Thickness 12M
    Depth to top 10M
    Width 20M
    Length 41M
    Area 6HA
    Field Value
    Type of Orebody #1 DISSEMINATED
    Shape of Orebody #1 PIPELIKE
    Primary mode of Origin MAGMATIC DIFFER
    Primary Ore Control IGNEOUS
    Degree of Wallrock Alter. INTENSE
    Type of Wallrock Alter. #1 OTHER
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. 0
    Min. Thick. Unconsol. Mat. 0
    Total Surface Area (HA) 6
    Date of Last Modification 830316

Economic information

Economic information about the deposit and operations

Operation type Surface
Development status Past Producer
Commodity type Metallic
Significant No
Discovery year 1951
Year of first production 1952

Mining district

District name New Idria

Mineral rights holdings

Type of mineral rights Fee Ownership

Land status

Ownership category Private

Ownership information

  • Type Operator
    Owner Chambers And Russel (Southwest Oil Co)
    Home office California
    Year 1975

Reserves and resources

  • Type In-situ
    Estimate year 1980
    Inferred 54,000mt ore
    Total resources 54,000mt ore
    Commodity Subtype Grade units Group Importance Year
    Chromium Cr2O3 52.98 wt-pct Chromium Major 1980
    Iron Fe 14.47 wt-pct Iron Trace 1980

Workings at the site

  • Type of workings Surface
    Area 4.3HA
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method PROPOSED
    Mining Method OPEN PIT
    Swell Factor .6
    Percent Waste Rock 0
    Avg. Overburden Thickness 10
    Primary Material Cover HARDPAN
    Percentage 100
    Hardness of Ore HARDPAN
    Avg. Bench Height (meters) 0
    Max. Pit Slope (degrees) 45
    Capacity 100
    Capacity Units MT ORE/DAY
    Preprod. Stripping Vol. 43
    Unit Production Cost 10.15
    Units of Production $/MT ORE
    Operating Days per Year 350
    Operating Shifts per Day 1
    Year of Information 1975

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
U.S. Bureau of Mines Minerals Availability System MAS 0060190009
USGS Mineral Resources Data System MRDS M100121 MAS references MRDS

Bibliographic references

  • Deposit

    CALIF DIV OF MINES AND GEOL SPEC REPT 71.

  • Deposit

    CALIF DIV OF MINES AND GEOL BULL 134 CH2 PT2 PP54-55.

General comments

Subject category Comment text
Deposit 1-75 ALTERATION TYPE - INTENSE SERPENTINIZATION. CROME/IRON RATIO 2.8:1 YIELDS 06 PERCENT NONRECOVER IRON ORE CAN BE UPGRADED TO 46PER CENTCR2O3 NO MINE CAPITAL REQUIRED- CONTRACT PRICE NO MILL CAPITAL REQUIRED- CUSTOM CHARGE ANALYSIS BY CDMG IN 1976 GAVE FOLLOWING PERCENTAGES-DISSEMIN E,LOW GRADE=S102 4.33,CR2O3 52.98,FEO 11.21,TOTAL FE 14.47,A 56,MGO 13.27,CR/FE 3.22.DISSEMINATED ORE,HIGH GRADE=S102 5.0 51.15,FEO 10.24,TOTAL FE 12.84,AL203 7.56,MGO 14.09,CR/FE 3. MILL CONCENTRATE=S102 1.83,CR2O3 54.81,FEO 13.31,TOTAL FE 14 03 6.61,MGO 11.61,CR/FE 3.33

Reporter information

Type Date Name Affiliation Comment
Reporter 31-OCT-1997 Wetzel, Nicholas U.S. Bureau of Mines