| Deposit ID | 10109520 |
|---|---|
| MRDS ID | M045267 |
| Record type | Site |
| Current site name | Mammoth Bar |
| Alternate or previous names | Pacific Gold Dredging |
| Geographic coordinates: | -121.00547, 38.92045 (WGS84) |
|---|---|
| Elevation | 183 |
| Location accuracy | 100(meters) |
| Relative position | ON MIDDLE FORK 3 MI EAST OF CONFLUENCE OF AMERICAN RIVER AND MIDDLE FORK, ABOUT 4 MI NORTHEAST OF AUBURN, Accurate On Bar |
Political divisions (FIPS codes)
Placer(county)
California(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Auburn(quadrangle 1:24,000 scale)
Sacramento(quadrangle 1:100,000 scale)
Sacramento(quadrangle 1:250,000 scale)
Hydrologic units (watersheds)
North Fork American(hydrologic unit)
Lower Sacramento(hydrologic accounting unit)
Sacramento(hydrologic subregion)
California(hydrologic region)
Federal lands
Bureau of Land Management(Bureau of Land Management CA)
Bureau of Land Management CA BLM(Type of land area)
BLM(Federal land areas administered by BLM)
| Country | State | County |
|---|---|---|
| United States | California | Placer |
| Meridian | Township | Range | Section | Fraction | State |
|---|---|---|---|---|---|
| Mount Diablo | 012N | 009E | 05 | NEAR CENTER | California |
| Commodity | Importance |
|---|---|
| Gold | Primary |
| Platinum Critical | Secondary |
| Osmium | Tertiary |
| Iridium Critical | Tertiary |
| Palladium Critical | Tertiary |
| Rhodium Critical | Tertiary |
| Materials | Type of material |
|---|---|
| Gold | Ore |
| Result | PGE SAMPLE ANALYZED: 37.22% PT, 34.72% IR, $28.02 AU, TR PD AND RH (LOGAN, P. 109). AU GRADES ESTIMATED AT 0.0048 OZ/YD (80 PPB) |
|---|
| Model code | 119 |
|---|---|
| USGS model code | 39a |
| Deposit model name | Placer Au-PGE |
| Mark3 model number | 54 |
| Host or associated | Host | ||
|---|---|---|---|
| Rock type | Unconsolidated Deposit > Gravel | ||
| |||
| (1) | -121.00547, 38.92045 |
|---|
| General form | STREAM SEDIMENT DEPOSITS |
|---|---|
| Depth to top | 0M |
| Development status | Producer |
|---|---|
| Commodity type | Metallic |
| Deposit size | Small |
| Significant | No |
| Production years | 1914-1927 |
| District name | Upper American River Area |
|---|
| Ownership category | Private |
|---|
| Type | Operator |
|---|---|
| Owner | El Dorado And Placer Counties Gold Mining And Power Co., Pacific Gold Dredging Co. |
| First year | 1910 |
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | M045267 |
LOGAN, C.A., 1927, PLACER COUNTY: CALIFORNIA STATE MINING BUREAU, 23RD REPORT OF THE STATE MINERALOGIST, NO. 3, P. 284.
LOGAN, C.A., 1919, PLATINUM AND ALLIED METALS IN CALIFORNIA: CALIFORNIA STATE MINING BUREAU BULLETIN 85, P. 29-30, 109.
WARING, C.A., 1919, PLACER COUNTY: CALIFORNIA STATE MINING BUREAU, 15TH REPORT OF THE STATE MINERALOGIST, PT. 3, P. 386.
| Subject category | Comment text |
|---|---|
| Deposit | PACIFIC GOLD DREDGING CO. ALSO OPERATED ON THE NORTH FORK AMERICAN RIVER (SEE M045269) ; INFO.SRC : 1 PUB LIT |
| Deposit | DREDGING WAS CARRIED OUT ON BARS OF OLD HYDRAULIC TAILINGS. GRAVELS AVERAGED 28 FT DEEP |
| Deposit | SEE ALSO: MRDS M045269. |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-NOV-74 | Blair, Will N. | U.S. Geological Survey | |
| Updater | 01-JAN-89 | Peterson, Jocelyn A. | 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.