| Deposit ID | 10141637 |
|---|---|
| MRDS ID | W025929 |
| MAS/MILS ID | 0061090034 |
| Record type | Site |
| Current site name | Horseshoe Claim |
| Alternate or previous names | Horseshoe, Grassely Claims, Pedro Lease |
| Related records | 10077867 |
| Point of reference | Main Entrance |
|---|---|
| Geographic coordinates: | -120.5052, 37.90432 (WGS84) |
| Elevation | 326 |
| Location accuracy | 10(meters) |
Political divisions (FIPS codes)
Tuolumne(county)
California(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
New Melones Dam(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 | NWSWNW | California |
| Commodity | Importance |
|---|---|
| Chromium Critical | Tertiary |
| Iron | Tertiary |
| Materials | Type of material |
|---|---|
| Chromite | Unknown |
| Olivine | Unknown |
| Opal | Unknown |
| Pyroxene | Unknown |
| Serpentine | Unknown |
| Main Entrance (1) | -120.5052, 37.90432 |
|---|
| Strike | N20W | ||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dip | 20W | ||||||||||||||||||||||||||||||||
| Thickness | 1M | ||||||||||||||||||||||||||||||||
| Length | 18M | ||||||||||||||||||||||||||||||||
| Width | 2M | ||||||||||||||||||||||||||||||||
| Area | 2HA | ||||||||||||||||||||||||||||||||
| Depth to top | 0M | ||||||||||||||||||||||||||||||||
| |||||||||||||||||||||||||||||||||
| Operation type | Underground |
|---|---|
| Development status | Past Producer |
| Commodity type | Metallic |
| Significant | No |
| Year of first production | 1918 |
| District name | Peoria Flat |
|---|
| Type of mineral rights | Patented |
|---|
| Ownership category | Private |
|---|
| Type | Owner |
|---|---|
| Owner | Grassley, Eugene |
| Home office | California |
| Year | 1976 |
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| U.S. Bureau of Mines | Minerals Availability System | MAS | 0061090034 | |
| USGS | Mineral Resources Data System | MRDS | W025929 | MAS references MRDS |
CALIFORNIA DIVISION OF MINES AND GEOLOGY BULLETIN 134,
PART 3, CHAPTER 1, 1948, P. 26-27.
CALIFORNIA DIVISON OF MINES AND GEOLOGY SPECIAL REPORT 41,
P. 55, PLATES 2-4.
| Subject category | Comment text |
|---|---|
| Deposit | ORE EXPOSED AT SHAFT COLLAR, 1 METER WIDE, 15 METERS LONG. MINE WORKINGS LOCATED IN OLD PLACER DIGGINGS. RESERVES ESTIMATED TO BE 200 LONGTONS OF MILLING GRADE ORE AVERAGING 22 TO 25 PERCENT CR2O3. NO ANALYSIS OF ORE AVAILABLE. INADEQUATE RESOURCES FOR COST ANALYSIS. ANALYSIS BY CDMG IN 1976 GAVE FOLLOWING PERCENTAGES- DISSEMINATED ORE=S102 11.70, CR2O3 38.37, FEO 12.08, TOTAL FE 16.08, AL203 08.29, MG0 1 5.59, CR/FE 2.10, MGO 15.59, CR/FE 2.10. |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 23-SEP-1994 | 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.