Dyer prospect, Altamont, Alameda County, California, USAi
| Regional Level Types | |
|---|---|
| Dyer prospect | Prospect |
| Altamont | Unincorporated Community |
| Alameda County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
37° 45' 34'' North , 121° 40' 1'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Mountain House | 9,675 (2011) | 11.2km |
| Byron | 1,277 (2011) | 12.2km |
| Livermore | 88,126 (2017) | 12.4km |
| Discovery Bay | 13,352 (2011) | 17.6km |
| Brentwood | 58,968 (2017) | 19.3km |
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 |
|---|---|---|
| Livermore Valley Lithophiles | Livermore, California | 12km |
| Antioch Lapidary Club | Antioch, California | 30km |
| Mineral & Gem Society of Castro Valley | Hayward, California | 38km |
| East Bay Mineral and Lapidary Club | Hayward, California | 38km |
| Stockton Lapidary & Mineral Club | Stockton, California | 40km |
A Mn occurrence located in sec. 17, T2S, R3E, MDM, 1.8 km (1.1 miles; 7,900 feet) NNW of Altamont. Discovered in 1942. Owned by the Dyer Estate, California (1974). MRDS database stated accuracy for this location is 1,000 meters.
MRDS note: Location should be checked on MRC shows sec. 17, T2S, R3E.
Irregular pebbles of hard manganese oxide occur in soil in a roughly linear belt, that is ½ mile long, 100 feet wide, and dips gently E. The pebbles are irregular in shape, averaging 1½ inches (3.75 cm) in diameter, and consisting of interlacing veins of psilomelane in a soft, rusty-colored, limy matrix. The surface of the ore consists of tiny radiating needles of well-crystallized pyrolusite. Half a mile E of the main occurrence of the pebbles is a bed of limestone and shaly limestone conglomerate among the pebbles of which are a few pebbles off white chert and manganese oxide and may be the source of the pebbles farther W. Thea manner of occurrence indicates the prospect has little economic value. Local rocks include Upper Cretaceous marine rocks, unit 1 (Upper Great Valley Sequence).
No production. It is doubtful if more than 5 tons of ore averaging 30-35% Mn can be found on the property.
Analytical data results: Pebbles are 30 to 35% Mn.
MRDS note: Location should be checked on MRC shows sec. 17, T2S, R3E.
Irregular pebbles of hard manganese oxide occur in soil in a roughly linear belt, that is ½ mile long, 100 feet wide, and dips gently E. The pebbles are irregular in shape, averaging 1½ inches (3.75 cm) in diameter, and consisting of interlacing veins of psilomelane in a soft, rusty-colored, limy matrix. The surface of the ore consists of tiny radiating needles of well-crystallized pyrolusite. Half a mile E of the main occurrence of the pebbles is a bed of limestone and shaly limestone conglomerate among the pebbles of which are a few pebbles off white chert and manganese oxide and may be the source of the pebbles farther W. Thea manner of occurrence indicates the prospect has little economic value. Local rocks include Upper Cretaceous marine rocks, unit 1 (Upper Great Valley Sequence).
No production. It is doubtful if more than 5 tons of ore averaging 30-35% Mn can be found on the property.
Analytical data results: Pebbles are 30 to 35% Mn.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
1 valid mineral.
Rock Types Recorded
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
| ⓘ 'Psilomelane' |
| ⓘ Pyrolusite Formula: Mn4+O2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Pyrolusite | 4.DB.05 | Mn4+O2 |
| Unclassified | |||
| ⓘ | 'Psilomelane' | - | |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Pyrolusite | Mn4+O2 |
| Mn | Manganese | |
| Mn | ⓘ Pyrolusite | Mn4+O2 |
Other Databases
| Link to USGS MRDS: | 10027960 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- California Coast RangesAccretionary Complex
- Franciscan DomainDomain
- Great Valley BasinBasin
- Sonoma-Livermore BasinBasin
USA
- California
- Diablo RangeMountain Range
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