| Deposit ID | 10048015 |
|---|---|
| MRDS ID | M700412 |
| Record type | Site |
| Current site name | Castro Mine |
| Related records | 10262411 |
| Geographic coordinates: | -120.70847, 35.37358 (WGS84) |
|---|---|
| Elevation | 488 |
| Relative position | 15 MI. E. OF MORRO BAY, CA., AND 10 MI. NW OF SAN LUIS OBISPO, CA. |
Political divisions (FIPS codes)
San Luis Obispo(county)
California(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
San Luis Obispo(quadrangle 1:24,000 scale)
San Luis Obispo(quadrangle 1:100,000 scale)
San Luis Obispo(quadrangle 1:250,000 scale)
Hydrologic units (watersheds)
Central Coastal(hydrologic unit)
Central California Coastal(hydrologic accounting unit)
Central California Coastal(hydrologic subregion)
California(hydrologic region)
Federal lands
Los Padres National Forest(National Forest)
National Forest FS(Type of land area)
FS(Federal land areas administered by FS)
| Country | State | County |
|---|---|---|
| United States | California | San Luis Obispo |
| Meridian | Township | Range | Section | Fraction | State |
|---|---|---|---|---|---|
| Mount Diablo | 029S;029S;029S | 012E;012E;012E | 29;29;29 | NW OF NW OF SE | California |
| Commodity | Importance |
|---|---|
| Chromium Critical | Primary |
| Materials | Type of material |
|---|---|
| Chromite | Ore |
| Result | CONCENTRATES AVERAGED 42% CR2O3 WITH A CR TO FE RATIO OF 2.4. |
|---|
| Host or associated | Host | ||
|---|---|---|---|
| Rock type | Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Dunite | ||
| Rock unit name | Franciscan;Toro | ||
| Rock description | Franciscan;Toro | ||
| |||
| (1) | -120.70847, 35.37358 |
|---|
| Type of structure | Regional |
|---|---|
| Structure description | Dominant Trend Of The Sonta Lucia Range Is To The Nw. |
| General form | LENSE |
|---|---|
| Thickness | 7.62M |
| General form | LENSE |
|---|
| Development status | Past Producer |
|---|---|
| Commodity type | Metallic |
| Deposit size | Medium |
| Significant | No |
| Discovery year | 1876 |
| Discoverer | Jose Castro |
| Year of first production | 1875 |
| Year of last production | 1957 |
| Ownership category | Private |
|---|
| Type | Operator |
|---|---|
| Owner | Castro Mining Co., San Francisco (Now Defunct) |
| First year | 1957 |
| Type | Owner |
|---|---|
| Owner | Ernest Vollmer Jr., |
| Home office | P. O. Box 317, San Luis Obispo, Ca. 93406 |
| First year | 1976 |
| Year | 1920 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Period | 1918-1920 | ||||||||||||||
| Material | CON | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Cp_Grade: ^Avg. 40% Cr2o3 | ||||||||||||||
| |||||||||||||||
| Year | 1944 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Period | 1942-1944 | ||||||||||||||
| Material | CON | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Cp_Grade: ^Avg. 42% Cr2o3 | ||||||||||||||
| |||||||||||||||
| Year | 1957 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Period | 1918-1957 | ||||||||||||||
| Material | CON | ||||||||||||||
| Accuracy | Estimate | ||||||||||||||
| Description | Cp_Grade: ^Avg. 42% Cr2o3 | ||||||||||||||
| |||||||||||||||
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | M700412 |
STINSON, M. C., 1975, CDMG MINERAL PROPERTY REPORT, UNPUBLISHED
STINSON, 1975
| Subject category | Comment text |
|---|---|
| Deposit | CHROMITE BODIES ELONGATE TO NW. CASTRO MINE PROPERTY IS PATENTED. |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-MAR-1982 | Oster, Karel L. (Albers, John P.) | U.S. Geological Survey |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.
These are landing pages for further research — the state agencies don't currently expose per-mine deep links.