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Reciprocity Mine, Gold Hill, Ophir Mining District (Auburn Mining District; Duncan Hill Mining District), Placer County, California, USAi
| Regional Level Types | |
|---|---|
| Reciprocity Mine | Mine |
| Gold Hill | Hill |
| Ophir Mining District (Auburn Mining District; Duncan Hill Mining District) | Mining District |
| Placer County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
38° 54' 11'' North , 121° 10' 5'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Newcastle | 1,224 (2011) | 4.4km |
| Penryn | 831 (2011) | 5.7km |
| Auburn | 13,953 (2017) | 7.9km |
| North Auburn | 13,022 (2011) | 8.1km |
| Loomis | 6,733 (2017) | 9.3km |
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
Local clubs are the best way to get access to collecting localities
| Club | Location | Distance |
|---|---|---|
| Roseville Rock Rollers | Roseville, California | 20km |
| Fossils for Fun Society, Inc. | North Highlands, California | 30km |
| Sacramento Valley Detecting Buffs | North Highlands, California | 30km |
| Nevada County Gem & Mineral Society | Grass Valley, California | 36km |
| El Dorado County Mineral and Gem Society | Placerville, California | 37km |
A former Au-Ag occurrence/ mine located in the N½SW¼ sec. 11, T12N, R7E, MDM, 1.2 km (0.7 mile) E of Gold Hill, N of Auburn Ravine (3 miles NW of Newcastle). Owned by I. Meyer (1935). MRDS database stated accuracy for this location is 500 meters.
Mineralization is a vein deposit hosted in granodiorite. The ore body is 1.22 meters (4 feet) thick. Local rocks include Mesozoic granitic rocks, unit 3 (Sierra Nevada, Death Valley area, Northern Mojave Desert and Transverse Ranges).
Workings include surface and underground openings with a length of 9.14 meters and an overall depth of 6.1 meters and comprised of an open cut and a shaft.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Native Gold Formula: Au |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
Other Databases
| Link to USGS MRDS: | 10101335 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Foothills-Wallowa DomainDomain
- Sierra Nevada BatholithVolcanic Arc
This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to
visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders
for access and that you are aware of all safety precautions necessary.
References
(n.d.) Minerals Availability System (MAS), U.S. Bureau of Mines.file #0060610057
