1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

New London Mine

Past Producer in San Luis Obispo county in California, United States with commodity Chromium
Map
XML
JSON
KML
B

Geologic information

Identification information

Deposit ID 10048016
MRDS ID M700414
Record type Site
Current site name New London Mine

Geographic coordinates

Geographic coordinates: -120.68958, 35.3533 (WGS84)
Elevation 323
Relative position APPROX. 6 MILES NW OF SAN LUIS OBISPO, CA.
(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 030S;030S;030S 012E;012E;012E 04;04;04 NE OF NW OF NE California

Comments on the location information

  • MINE LOCATED ON WEST SIDE OF A STEEP GULLEY FORMED BY WEST BRANCH OF CHORRO CREEK. ; INFO FROM LAND.ST :(1976)

Commodities

Commodity Importance
Chromium Primary

Comments on the commodity information

  • LUMP ORE SHIPPED DURING 1950'S: 43.52% CR2O3, 10.77% FE, CR TO FE RATIO 2.70.

Materials information

Materials Type of material
Chromite Ore

Alteration

  • (Local) Serpentinization Of Saxonite, Dunite, Minor Pyroxenite

Analytical data

Result AVG. GRADE OF CONCENTRATS SHIPPED DURING 1950'S: 44.23% CR2O3, 11.86% FE, CR TO FE RATIO 2.55.

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Dunite
    Stratigraphic age (youngest) Miocene
  • Host or associated Associated
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Harzburgite
  • Host or associated Associated
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Pyroxenite
  • Host or associated Host
    Rock type Metamorphic Rock > Serpentinite
    Rock unit name Monterey
    Rock description Monterey

Nearby scientific data

(1) -120.68958, 35.3533
ListMap

Geologic structures

Type of structure Local
Structure description Synclinally Folded Members Of Monterey Fm. Under Landslide Block.

Ore body information

  • General form LENSE
    Thickness 3.66M
  • General form LENSE

Comments on the geologic information

  • CHROMITE DEPOSIT LIES ON SOUTHERN MOST EXTENT OF SERIES OF MASSIVE LANDSLIDES OCCURING IN SOUTHERN SANTA LUCIA RANGE.

Economic information

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1885
Year of first production 1882
Year of last production 1957

Land status

Ownership category Private

Ownership information

  • Type Operator
    Owner H. J. Stevens
  • Type Owner
    Owner Purdy, Evelyn (Mineral Rights)
    Home office 635 Riverside Ave., Santa Cruz, Ca. 95060

Production statistics

  • Year 1918
    Period 1916-1918
    Material ORE
    Accuracy Estimate
    Description Cp_Grade: ^Avg. 44.23% Cr2o3
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Cr2O3 Chromium Chromium 44wt-pct
  • Year 1943
    Material ORE
    Accuracy Accurate
    Description Ap_Grade: ^Avg. 41.59% Cr2o3
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Cr2O3 Chromium Chromium 42wt-pct
  • Year 1953
    Material CON
    Accuracy Accurate
    Description Ap_Grade: ^Avg. 44.10% Cr2o3
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Cr2O3 Chromium Chromium 44wt-pct

Reserves and resources

  • Type In-situ
    Estimate year 1975
    Total resources 223,000mt ore
    Commodity Subtype Grade units Group Importance Year
    Chromium Cr2O3 5 wt-pct Chromium Major 1975

Comments on the reserve resource information

  • CDMG MINERAL PROP. REPORT, UNPUBLISHED.

Workings at the site

  • Type of workings Surface
    Overall depth 30.48M
    Overall length 106.68M
    Overall width 60.96M

Comments on the workings information

  • PRE 1950'S WORKINGS WERE UNDERGROUND. OPEN PIT MINE DEVELOPED IN 1950.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS M700414

Bibliographic references

  • Deposit

    STINSON, M.C., 1975, CDMG MINERAL PROPERTY REPORT, UNPUBLISHED

  • Production

    STINSON, 1975

General comments

Subject category Comment text
Deposit Discovery Year: 1880'S
Deposit ORE BODIES OCCURRED IN ZONE WITH APPROX. STRIKE OF N 65-75 W AND DIP OF 40 N. ORE OCCURRED IN 2 FORMS: LAYERED, DISSEMINATED ORE, WITH LAYERS 2.5 CM THICK OR MORE AND MASSIVE ORE.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAR-1982 Oster, Karel L. (Albers, John P.) U.S. Geological Survey