| Deposit ID | 10086500 |
|---|---|
| MRDS ID | X025318 |
| Record type | Site |
| Current site name | Oriental |
| Alternate or previous names | Alta |
| Related records | 10116707 |
| Geographic coordinates: | -120.85881, 39.45989 (WGS84) |
|---|---|
| Elevation | 1234 |
| Relative position | 1 MI SOUTH OF ALLEGHANY |
Political divisions (FIPS codes)
Sierra(county)
California(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Alleghany(quadrangle 1:24,000 scale)
Truckee(quadrangle 1:100,000 scale)
Chico(quadrangle 1:250,000 scale)
Hydrologic units (watersheds)
Upper Yuba(hydrologic unit)
Lower Sacramento(hydrologic accounting unit)
Sacramento(hydrologic subregion)
California(hydrologic region)
Federal lands
Tahoe National Forest(National Forest)
National Forest FS(Type of land area)
FS(Federal land areas administered by FS)
| Country | State | County |
|---|---|---|
| United States | California | Sierra |
| Meridian | Township | Range | Section | Fraction | State |
|---|---|---|---|---|---|
| Mount Diablo | 019N}018N | 010E}010E | 33}04 | E2 OF SW4 OF SE4 (33); E2 OF NW4 OF W2 OF NE4 (04) | California |
| Commodity | Importance |
|---|---|
| Gold | Primary |
| Platinum Critical | Tertiary |
| Materials | Type of material |
|---|---|
| Gold | Ore |
| Pyrite | Ore |
| Silver | Ore |
| Quartz | Gangue |
| Talc | Gangue |
| Result | ORE RAN AS HIGH AS $1000/TON. PT DETECTED IN NATIVE GOLD SAMPLES UP TO 86.4 PPM (AVG. 32 PPM) |
|---|
| Model code | 273 |
|---|---|
| USGS model code | 36a |
| Deposit model name | Low-sulfide Au-quartz vein |
| Mark3 model number | 27 |
| Host or associated | Host |
|---|---|
| Rock type | Metamorphic Rock > Metasedimentary Rock > Quartzite |
| (1) | -120.85881, 39.45989 |
|---|
| Type of structure | Regional |
|---|---|
| Structure description | Melones Fault Zone |
| Type of structure | Local |
| Structure description | Fault |
| General form | VEIN |
|---|---|
| Strike | EW-N65W |
| Dip | 28-50N |
| Thickness | 6.1M |
| Development status | Past Producer |
|---|---|
| Commodity type | Metallic |
| Deposit size | Small |
| Significant | No |
| District name | Alleghany District |
|---|
| Ownership category | National Forest |
|---|
| Type of workings | Surface/Underground |
|---|---|
| Name of workings | ORIENTAL |
| Area | 62.081HA |
| Overall depth | 237.74M |
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | X025318 |
MCCULLOCH, W.C., OESTERLING, W.A., SPURCK, W.H., AND TISCHLER, M.S., 1964, MINERALS FOR INDUSTRY, NORTHERN CALIFORNIA: SUMMARY OF GEOLOGICAL SURVEY OF 1955-1961: SOUTHERN PACIFIC COMPANY, V. 2, P. 37.
AVERILL, C.V., 1942, MINES AND MINERAL RESOURCES OF SIERRA COUNTY: CALIFORNIA JOURNAL OF MINES AND GEOLOGYU, V. 38, NO. 1, P. 33, 35, 62.
FERGUSON, H.G., AND GANNETT, R.W., 1932, GOLD QUARTZ VEINS OF THE ALLEGHANY DISTRICT, CALIFORNIA: U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 172, P. 98-101, PL. 15.
J.K. BOHLKE, 1982, WRITTEN COMMUN. TO N.J PAGE, U.S. GEOLOGICAL SURVEY
LOGAN, C.A., 1941, MINERAL RESOURCES OF NEVADA COUNTY: CALIFORNIA JOURNAL OF MINES AND GEOLOGY, V. 37, NO. 3, P. 374-408, 425-436, 441-468.
FERGUSON AND GANNETT (1932),, AVERILL (1942)
| Subject category | Comment text |
|---|---|
| Deposit | VEIN PRODUCTIVE WHEREVER SERPENTINE CONTACT WAS EXPLORED. MOST PRODUCTIVE AREA WAS A NARROW BAND OF GABBRO BETWEEN GRANITE AND SERPENTINE. A NEW ORE BODY WAS DISCOVERED IN 1952. VEINS CONSIST OF BRANCHES AND STRINGERS WITH THE GREATEST THICKNESS IN 7TH AND 8TH LEVELS. VEIN DISPLACES POROUS GRANITE DIKE ABOUT 160 FT HORIZONTALLY AND 200 FT DOWN DIP. DIKE IS 50 FT THICK IN UPPER WORKINGS, 350 FT THICK IN LOWER WORKINGS. GRANITE IS COARSE, UP TO ICM+. FELDSPAR IN GABBRO UNRECOGNIZABLE, AUGITE ALMOST COMPLETELY ALTERED TO HORNBLENDE. MINOR THRUSTING OCCURRED DURING AND AFTER MINERALIZATION. ALTA MINE IS 500 FT SOUTH-SOUTHEAST OF ORIENTAL SHAFT. DUMPS AT ALTA MINE CONTAIN COARSELY CRYSTALLINE ARSENOPYRITE AND PYRITE. VEINS AT THE TWO MINES MAY UNITE IN BROKEN GROUND ABOVE 5TH LEVEL. |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-MAR-1979 | Hayden, F. (Albers, J.) | U.S. Geological Survey | |
| Updater | 01-AUG-1993 | Peterson, Jocelyn A. | U.S. Geological Survey |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.
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