| Deposit ID | 10138501 |
|---|---|
| MAS/MILS ID | 0060091474 |
| Record type | Site |
| Current site name | Madrid Mine |
| Alternate or previous names | True Blue, Genochio Mine |
| Point of reference | Main Entrance |
|---|---|
| Geographic coordinates: | -120.51291, 38.14301 (WGS84) |
| Elevation | 622 |
| Location accuracy | 10(meters) |
Political divisions (FIPS codes)
Calaveras(county)
California(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Calaveritas(quadrangle 1:24,000 scale)
San Andreas(quadrangle 1:100,000 scale)
Sacramento(quadrangle 1:250,000 scale)
Hydrologic units (watersheds)
Upper Calaveras(hydrologic unit)
San Joaquin(hydrologic accounting unit)
San Joaquin(hydrologic subregion)
California(hydrologic region)
| Country | State | County |
|---|---|---|
| United States | California | Calaveras |
| Meridian | Township | Range | Section | Fraction | State |
|---|---|---|---|---|---|
| Mount Diablo | 003 N | 013 E | 02 | SWSWNE | California |
| Commodity | Importance |
|---|---|
| Chromium Critical | Tertiary |
| Iron | Tertiary |
| Materials | Type of material |
|---|---|
| Asbestos | Unknown |
| Chlorite | Unknown |
| Chromite | Unknown |
| Serpentine | Unknown |
| Talc | Unknown |
| Main Entrance (1) | -120.51291, 38.14301 |
|---|
| Strike | N80W | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dip | 65S | ||||||||||||||||||||||||||||||
| Thickness | 3.7M | ||||||||||||||||||||||||||||||
| Length | 30M | ||||||||||||||||||||||||||||||
| Width | 5M | ||||||||||||||||||||||||||||||
| 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 | 1917 |
| District name | Murphys Area |
|---|
| Type of mineral rights | Other |
|---|
| Ownership category | Private |
|---|
| Type | Owner |
|---|---|
| Owner | Genochio, Adolph |
| Home office | California |
| Year | 1976 |
| First year | 1942 |
| Type | Owner |
|---|---|
| Owner | Margaret S. Shepard |
| Interest | 100 |
| Home office | California |
| Year | 1976 |
| Type of workings | Surface | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Area | 1HA | ||||||||||||||||||
| |||||||||||||||||||
| Type of workings | Underground | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Length | 15M | ||||||||||||||||||||||
| Overall depth | 15M | ||||||||||||||||||||||
| |||||||||||||||||||||||
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| U.S. Bureau of Mines | Minerals Availability System | MAS | 0060091474 |
CAL STATE,MINING BUR BULL 76 P.123, 1918
CAL. DIV. MINES GEOL. BULL 134 PT3, CHAP 2, P.56-57
COOP WAR MINERALS INVEST PROJ,CALAVERAS CO NO.17 TALIAFERRO
MINES & MINERAL RESOURCES CALAVERAS.COUNTY REPT NO.2 P.22,12
| Subject category | Comment text |
|---|---|
| Deposit | TALIAFERRO(1918) STATES THAT ORE VARIED BETWEEN 30-35 PERCENT. NO ESTIMATES OF RESERVES MADE BUTCATER(1948) STATES THAT CON LE ORE REMAINS AT THE BOTTOM OF CAVED WORKINGS. TOTAL PROD 1039 LONG TONS. MINE VISTED 17 SEPT.1925. THE AVERAGE MINABLE GRADE OF CHROMITE IS 32% & IRON IS 7.2% INSUFFICIENT DATA FOR MATRIX CALCULATIONS. ANALYSIS BY CDMG IN 1976 GAVE FOLLOWING PERCENTAGES-MASSIVE 2 06.04,CR2O3 26.31,FEO 08.89,TOTAL FE 12.07,AL203 29.52,MGO CR/FE 1.92. |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 05-NOV-1984 | Unknown | 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.