Chocolate Drop group (Chocolate Drop claim; Black Queen claim; Black Jack claim; Big Bear claim; War Eagle; Black Point; Dixie Queen; Alaskan; McKinney; Tadpole; Big Bear; Chipmunk; Chipmunk and Laskin; Ebony Group; Chocolate Drop Mine), Thumb Peak, Palo Verde Mining District, Palo Verde Mountains, Imperial County, California, USAi
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Latitude & Longitude (WGS84):
33° 24' 26'' North , 114° 55' 51'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Palo Verde | 171 (2011) | 18.7km |
| Cibola | 250 (2011) | 26.7km |
| Ripley | 692 (2011) | 28.7km |
| Mesa Verde | 1,023 (2011) | 28.8km |
| Blythe | 19,208 (2017) | 38.3km |
Mindat Locality ID:
76985
Long-form identifier:
mindat:1:2:76985:0
GUID (UUID V4):
07f1508c-c842-4b65-b34c-331a8349f2b9
A former Mn-baryte-Ca-fluorspar-Fe occurrence/mine located in the S½ sec. 7 and in the N½ sec. 18, T9S, R20E, SBM, 6.0 km (3.7 miles) W of Thumb Peak (coordinates of record), along the NW end of the Palo Verde Mountains, near the Riverside County line. The property comprises 4 claims. MRDS database accuracy for this location is not stated.
NOTE: The USGS MRDS database file presents MRDS file #10163241 as a related file. That latter file is not related to this locality.
Mineralization is hosted in Pliocene andesite and alluvium. The ore body strikes N and dips nearly vertical. The group consists of fissure deposits of manganese oxides (mainly hard, botryoidal psilomelane) occurring in Tertiary fanglomerate and, in one place (Black Jack claim), in andesite. The fissures occur over an area half a mile wide (0.8 km), strike close to N, and are vertical or steeply dipping. Brecciated zones along the fissures are cemented with, and partially replaced by, manganese oxide. Veinlets of manganese oxide, and of later calcite, cut fissure zones. Alternate bands of soft black, crystalline oxide are pyrolusite or possibly manganite. The Black Jack claim occurs in andesite that underlies the fanglomerate of the Chocolate Drop and Big Bear claims. Local rocks include Tertiary pyroclastic and volcanic mudflow deposits, unit 7 (Southern Mojave Desert).
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsMineral List
2 valid minerals.
Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
| ⓘ Calcite Formula: CaCO3 |
| ⓘ 'Psilomelane' |
| ⓘ Pyrolusite Formula: Mn4+O2 Colour: Black Description: Occurs as bands of black crystallione material alternating with bands of hard oxide. References: |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Pyrolusite | 4.DB.05 | Mn4+O2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| Unclassified | |||
| ⓘ | 'Psilomelane' | - | |
List of minerals for each chemical element
| C | Carbon | |
|---|---|---|
| C | ⓘ Calcite | CaCO3 |
| O | Oxygen | |
| O | ⓘ Calcite | CaCO3 |
| O | ⓘ Pyrolusite | Mn4+O2 |
| Ca | Calcium | |
| Ca | ⓘ Calcite | CaCO3 |
| Mn | Manganese | |
| Mn | ⓘ Pyrolusite | Mn4+O2 |
Other Databases
| Link to USGS MRDS: | 10109375 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Basin and Range BasinsBasin
- Mojave DomainDomain
USA
- California
- Mule Mts (Palo Verde Mts)Mountain Range
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References
