| Deposit ID | 10263108 |
|---|---|
| MRDS ID | W02598 |
| MAS/MILS ID | 0061090044 |
| Record type | Site |
| Current site name | Richards Mine |
| Alternate or previous names | Annex Chrome Mine, Rough and Ready Mine |
| Point of reference | Trench |
|---|---|
| Geographic coordinates: | -120.4924, 37.90822 (WGS84) |
| Elevation | 381 |
| Location accuracy | 10(meters) |
Political divisions (FIPS codes)
Tuolumne(county)
California(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Sonora(quadrangle 1:24,000 scale)
Oakdale(quadrangle 1:100,000 scale)
San Jose(quadrangle 1:250,000 scale)
Hydrologic units (watersheds)
Upper Stanislaus(hydrologic unit)
San Joaquin(hydrologic accounting unit)
San Joaquin(hydrologic subregion)
California(hydrologic region)
| Country | State | County |
|---|---|---|
| United States | California | Tuolumne |
| Meridian | Township | Range | Section | Fraction | State |
|---|---|---|---|---|---|
| Mount Diablo | 001 N | 013 E | 25 | SENESE | California |
| Commodity | Importance |
|---|---|
| Chromium Critical | Tertiary |
| Iron | Tertiary |
| Materials | Type of material |
|---|---|
| Chromite | Unknown |
| Magnetite | Unknown |
| Olivine | Unknown |
| Opal | Unknown |
| Serpentine | Unknown |
| Trench (1) | -120.4924, 37.90822 |
|---|
| Thickness | 3M | ||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Length | 92M | ||||||||||||||||||||||||||||||||
| Width | 12M | ||||||||||||||||||||||||||||||||
| Area | 1HA | ||||||||||||||||||||||||||||||||
| Depth to top | 0M | ||||||||||||||||||||||||||||||||
| |||||||||||||||||||||||||||||||||
| Operation type | Surface-Underground |
|---|---|
| Development status | Past Producer |
| Commodity type | Metallic |
| Significant | No |
| Discovery year | 1916 |
| Year of first production | 1918 |
| District name | Jamestown Area |
|---|
| Type of mineral rights | Fee Ownership |
|---|
| Ownership category | Private |
|---|
| Type | Owner |
|---|---|
| Owner | Otis J Rosaco 1975 |
| Interest | 100 |
| Home office | California |
| Year | 1976 |
| Type | Operator |
|---|---|
| Owner | Bradley Mining Co.,Leased 1942 |
| Home office | California |
| Year | 1976 |
| Type | In-situ | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Estimate year | 1947 | ||||||||||||||
| Inferred | 7800mt ore | ||||||||||||||
| Total resources | 10300mt ore | ||||||||||||||
| |||||||||||||||
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| U.S. Bureau of Mines | Minerals Availability System | MAS | 0061090044 | |
| USGS | Mineral Resources Data System | MRDS | 0W02598 | MAS references MRDS |
CDM AND G BULL. 134 PT 3 SIERRA NEVADA CHAP 1 PP 27-28 1948
COOPERATIVE WAR MINERAL INVEST INCAL.TUOLUMNE CO #16 UNPUB.1
IAFERRO
CAL STATE MINING BUREAU BULL NO. 76,PP.214,1918,BRADLEY.
ABOVE ARE CORRECT PROPERTY EXTENDS INTO SEC 30 T1N R14E
| Subject category | Comment text |
|---|---|
| Deposit | INDICATED ORE RESERVES 7700 TONS CITED FROM RECORD 700. DUMP CONTAINS ORE MIXED WITH WASTE,MAY YIELD 40 TONS OF ORE. ORE EXPOSED IN PIT IN ZONE 6 FEETWIDE AND STRIKING N60W. EXPOSED ORE IS IN HIGHLY WEATHERED SERPENTINITE. INADEQUATE RESOURCES FOR COST ANALYSIS. ANALYSIS BY CDMG IN 1976 GAVE FOLLOWING PERCENTAGES-MASSIVE 2 02.00,CR2O3 38.37,FEO 12.87,TOTAL FE 17.69,AL203 24.04,MGO CR/FE 1.91.DISSEMINATED ORE=S102 01.47,CR2O3 40.92,FEO 11.01 FE 16.08,AL203 21.73,MGO 15.75,CR/FE 2.24 |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 27-FEB-84 | Wetzel, Nicholas | U.S. Bureau of Mines |
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.