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New London Mine

Past Producer in San Luis Obispo county in California, United States with commodities Chromium, Iron
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Geologic information

Identification information

Deposit ID 10232451
MRDS ID W025016
MAS/MILS ID 0060790033
Record type Site
Current site name New London Mine
Alternate or previous names London Mine, London
Related records 10111016

Geographic coordinates

Point of reference Trench
Geographic coordinates: -120.68957, 35.35327 (WGS84)
Elevation 323
Location accuracy 10(meters)
(click for info)

Geographic areas

Country State County
United States California San Luis Obispo

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 030 S 012 E 04 NENWNE California

Commodities

Commodity Importance
Chromium Tertiary
Iron Tertiary

Materials information

Materials Type of material
Chromite Unknown
Magnesite Unknown
Serpentine Unknown
Talc Unknown
Uvarovite Unknown

Nearby scientific data

Trench (1) -120.68957, 35.35327
ListMap

Ore body information

  • Strike N65W
    Dip 40N
    Thickness 31M
    Depth to top 0M
    Width 24M
    Length 36M
    Area 5HA
    Field Value
    Type of Orebody #1 DISSEMINATED
    Shape of Orebody #1 TABULAR
    Shape of Orebody #2 LENTICULAR
    Shape of Orebody #3 IRREGULAR
    Primary mode of Origin MAGMATIC DIFFER
    Primary Ore Control LITHOLOGY
    Degree of Wallrock Alter. INTENSE
    Type of Wallrock Alter. #1 UNKNOWN
    Strike And Dip N65W
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. 0
    Min. Thick. Unconsol. Mat. 0
    Total Surface Area (HA) 5
    Date of Last Modification 830316

Economic information

Economic information about the deposit and operations

Operation type Surface-Underground
Development status Past Producer
Commodity type Metallic
Significant No
Discovery year 1882
Year of first production 1883

Mining district

District name Cuesta Pass

Mineral rights holdings

Type of mineral rights Minerals Only

Land status

Ownership category State

Ownership information

  • Type Owner
    Owner Evelyn Purdy-Minerals Only
    Interest 100
    Home office California
    Year 1976

Production statistics

  • Year 1883
    Description Lump Ore Mined 400 Mt
  • Year 1916
    Description Lump Ore Mined - 1916 To 1918 3500 Mt
  • Year 1936
    Description Lump Ore Mined 41 Mt
  • Year 1943
    Description Ore Mined 2500 Mt
  • Year 1943
    Description Concentrates Produced 200 Mt
  • Year 1953
    Description Lump Ore Mined 100 Mt @ 44.1 Pct
  • Year 1953
    Description Ore Mined 4900 Mt
  • Year 1953
    Description Concentrates Produced 1500 Mt @ 41.59 Pct
  • Year 1954
    Description Lump Ore Mined From 1954-1957 333 Mt @ 43.52 Pct
  • Year 1954
    Description Concentrates Produced From 1954-1957 1700 Mt @ 44.23 Pct

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
U.S. Bureau of Mines Minerals Availability System MAS 0060790033
USGS Mineral Resources Data System MRDS W025016 MAS references MRDS

Bibliographic references

  • Deposit

    CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD, CENTRAL

  • Deposit

    COAST REGION. SURFACE WATER DEGRADATION BY INACTIVE

  • Deposit

    METAL MINES IN NORTHWEST SAN LUIS OBISPO COUNTY, CA,

  • Deposit

    DECEMBER 1993 (P. 6-8).

  • Deposit

    CALIF. STATE MINING BUR. BULLETIN 76, 1918, P. 171-173.

  • Deposit

    CALIF. JOUR. MINES AND GEOL. V. 37, 1941, P. 162-163.

  • Deposit

    U.S. GEOLOGICAL SURVEY BULLETIN 945-B, 1944, P. 41-42.

  • Deposit

    U.S. BUREAU OF MINES RI 4783, 1951, P. 6.

  • Deposit

    CALIF. DIV. MINES BULLETIN 134, 1953, PART II, CHAPT. 2,

  • Deposit

    P. 62-63.

General comments

Subject category Comment text
Deposit 16 SAMPLES FROM DUMP IN 1941 AVERAGED 12.54 PERCENT CR2O3.SA FROM PIT FLOOR AVERAGED 11.68 PERCENT CR2O3. UNDERGROUND WORKINGS OBLITERATED BY OPEN PIT OPERATIONS OF T IS.APPROXIMATELY 500 TONS AVAILABLE IN MINE DUMPS AND ORE PI MINE DUMPS CURRENTLY SILTING DRINKING WATER SUPPLY. ANALYSIS BY CDMG IN 1976 GAVE FOLLOWING PERCENTAGES-DISSEMIN E=S102 03.12,CR2O3 54.08,FEO 12.73,TOTAL FE 16.72,AL203 10.8
Environmental Factors CHROMITE DEPOSITS IN THE CHORRO CREEK WATERSHED ARE NOT SULFIDES WITH POTENTIAL TO GENERATE ACID MINE DRAINAGE THOUGH THEY MAY ERODE CHROMIUM, ALUINUM, MAGNESIUM, IRON, MANGANESE, TITANIUM, CALCIUM, SILICON, AND NICKEL TO THE WATERSHED. METALS WHICH APPEAR TO BE ERODING FROM INACTIVE MINES INCLUDE MAGNESIUM, IRON, NICKEL, AND CHROMIUM. SAN LUISITO CREEK, PENNINGTON CREEK, AND UPPER CHORRO CREEK APPEAR TO BE THE MOST HEAVILY MINE-IMPACTED TRIBUTARIES IN THE CHORRO CREEK WATERSHED.

Reporter information

Type Date Name Affiliation Comment
Reporter 05-DEC-1994 Wetzel, Nicholas U.S. Bureau of Mines