Relief Hill (Relief; Relief Hill Blue Lead; Morning Star; IXCL), Relief, North Bloomfield Mining District, Nevada County, California, USAi
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Latitude & Longitude (WGS84):
39° 21' 41'' North , 120° 51' 39'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Washington | 185 (2011) | 5.3km |
| Pike | 134 (2011) | 14.6km |
| Dutch Flat | 160 (2011) | 17.4km |
| Nevada City | 3,152 (2017) | 17.5km |
| Alta | 610 (2011) | 17.7km |
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 |
|---|---|---|
| Nevada County Gem & Mineral Society | Grass Valley, California | 23km |
A former placer Au-PGE (Pt), Cr, Ti occurrence/mine located in secs. 33 & 34, T18N, R10E and in secs. 3, 4 & 9, T17N, R10E, MDM, at and near Relief (3 miles E of North Bloomfield); 10 miles NE of Nevada City), on National Forest land. Discovered in 1851. Operated by Western Gold Inc. (1941- ). MRDS database stated accuracy for this location is 1,000 to 5,000 meters (2 USGS MRDS files). There are 3 locations to this deposit. Location given id for the eastern canyon at the town of Relief. PGM production not verified.
Mineralization is a Pliocene stream placer deposit (Mineral occurrence model information: Model code: 119; USGS model code: 39a; BC deposit profile: C01. C02; Deposit model name: Placer Au-PGE; Mark3 model number: 54), hosted in gravel of the same age. The ore body is comprised of stream sediments at a thickness of 60.96 meters. Controls for ore emplacement included stream hydraulics. Occurrence of zircon inferred by the listing of Ti as a component present. Local rocks include Tertiary pyroclastic and volcanic mudflow deposits, unit 9 (Cascade Range) and/or Paleozoic marine rocks, undivided, unit 6 (Northwestern Sierra Nevada).
Workings included surface openings/operations comprised of an open pit, drifting and hydraulicking operations. Hydraulic operations were carried on in the spring of 1949.
Production data are found in: Logan, Clarence August (1941).
Analytical data results: Concentrates yielded $1,011.31 (period values)/ton Au (0.22 ounce/ton/7.5 ppm); $106.50 (period values)/ton Pt (0.016 ounce/ton/550 ppb) at 9 pounds concentrate/ton of gravel.
Reserve resource information: Resource estimates ran 5 to 15 million cubic yards remaining.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Chromite Formula: Fe2+Cr3+2O4 |
| ⓘ Ilmenite Formula: Fe2+TiO3 |
| ⓘ Magnetite Formula: Fe2+Fe3+2O4 |
| ⓘ Native Gold Formula: Au |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Chromite | 4.BB.05 | Fe2+Cr3+2O4 |
| ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
| ⓘ | Ilmenite | 4.CB.05 | Fe2+TiO3 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Chromite | Fe2+Cr23+O4 |
| O | ⓘ Ilmenite | Fe2+TiO3 |
| O | ⓘ Magnetite | Fe2+Fe23+O4 |
| Ti | Titanium | |
| Ti | ⓘ Ilmenite | Fe2+TiO3 |
| Cr | Chromium | |
| Cr | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | Iron | |
| Fe | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | ⓘ Ilmenite | Fe2+TiO3 |
| Fe | ⓘ Magnetite | Fe2+Fe23+O4 |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
Other Databases
| Link to USGS MRDS: | 10038014 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Calaveras-Baker DomainDomain
- Sierra Nevada BatholithVolcanic Arc
USA
- Sierra NevadaMountain Range
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References
(n.d.) Minerals Availability System (MAS), U.S. Bureau of Mines.file #0060570711
