Grand Central Mine (Hardt Mine; Hardt Tailings Dump), Trigo Mountains Mining District (Cibola Mining District), La Paz County, Arizona, USAi
| Regional Level Types | |
|---|---|
| Grand Central Mine (Hardt Mine; Hardt Tailings Dump) | Mine |
| Trigo Mountains Mining District (Cibola Mining District) | Mining District |
| La Paz County | County |
| Arizona | State |
| USA | Country |
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Latitude & Longitude (WGS84):
33° 17' 39'' North , 114° 34' 59'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Cibola | 250 (2011) | 8.0km |
| Palo Verde | 171 (2011) | 20.7km |
| Ripley | 692 (2011) | 26.6km |
| Ehrenberg | 1,470 (2011) | 34.9km |
| Blythe | 19,208 (2017) | 35.2km |
Mindat Locality ID:
33839
Long-form identifier:
mindat:1:2:33839:5
GUID (UUID V4):
b61a200f-03e2-4855-9d11-a45bff3b7d09
Ref.: Wilson, E.D. (1933) Geology and Mineral Deposits of Southern Yuma County, Arizona. Arizona Bureau of Mines Bulletin 134: 72-73.
Wilson, E.D., Cunningham, J.B., and Butler, G.M. (1934), Arizona Lode Gold Mines and Gold Mining (revised 1967), Arizona Bureau of Mines Bull. 137: 148.
Keith, Stanton B. (1978) State of Arizona Bureau of Geology and Mineral Technology, Geological Survey Branch Bull. 192, Index of Mining Properties in Yuma County, Arizona: 181 (Table 4).
Arizona Bureau of Mines file data.
MRDS database Dep. ID file #10102453, MRDS ID #M002427; and, Dep. ID #10137773, MAS ID #0040120243.
A small former surface and underground Au-Ag-Cu-Fe mine located in the center of sec. 36, T1S, R23W (protracted), about 6 miles ESE of Cibola on the NW slope of the Trigo Mountains. Started in the early 1890's.
Owned at times by Mexican operators and Hardt.
Mineralization is a vein deposit with spotty, high-grade gold and minor silver, with banded quartz, iron oxides, ferruginous calcite, pyrite crystals and bunches, in cavities and fracture fillings along a fault zone cutting Mesozoic schists striking 55°W and dipping 65°E, intruded by granite porphyry dikes. Other similar deposits 2 miles to the South.
The lode is comprised of narrow, branching quartz veins which occupy fault zones in schist. Schists which strike SSE and weather green to yellowish-gray, are intruded by a few narrow dikes of granite porphyry. The vein occurs in a fault zone that cuts schists in a S5W direction and dips 65ºE at the surface, but steepens somewhat in depth. The outcrop vein is 8 inches (20 cm) wide and about 300 feet long. The vein consists of banded, dense, white quartz in which numerous fractures and cellular cavities are filled with limonite, hematite and ferruginous calcite.
Workings include an inclined shaft reportedly 140 feet deep on the dip and several shallow cuts. Worked sporadically in in the early to late 1890's and again in the 1930's. Produced a few thousand dollars of gold (period values) before 1900.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Calcite Formula: CaCO3 Description: Ferruginous. References: |
| ⓘ Calcite var. Iron-bearing Calcite Formula: (Ca,Fe)CO3 References: |
| ⓘ Gold Formula: Au |
| ⓘ Hematite Formula: Fe2O3 |
| ⓘ 'Limonite' Description: Occurs in vein cavities and as pseudomorphs after pyrite. |
| ⓘ Pyrite Formula: FeS2 Description: Crystals and bunches in cavities and fracture fillings. References: |
| ⓘ Quartz Formula: SiO2 Description: Banded. References: |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Gold | 1.AA.05 | Au |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Hematite | 4.CB.05 | Fe2O3 |
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| ⓘ | var. Iron-bearing Calcite | 5.AB.05 | (Ca,Fe)CO3 |
| Unclassified | |||
| ⓘ | 'Limonite' | - | |
List of minerals for each chemical element
| C | Carbon | |
|---|---|---|
| C | ⓘ Calcite | CaCO3 |
| C | ⓘ Calcite var. Iron-bearing Calcite | (Ca,Fe)CO3 |
| O | Oxygen | |
| O | ⓘ Calcite | CaCO3 |
| O | ⓘ Hematite | Fe2O3 |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Calcite var. Iron-bearing Calcite | (Ca,Fe)CO3 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Pyrite | FeS2 |
| Ca | Calcium | |
| Ca | ⓘ Calcite | CaCO3 |
| Ca | ⓘ Calcite var. Iron-bearing Calcite | (Ca,Fe)CO3 |
| Fe | Iron | |
| Fe | ⓘ Hematite | Fe2O3 |
| Fe | ⓘ Pyrite | FeS2 |
| Fe | ⓘ Calcite var. Iron-bearing Calcite | (Ca,Fe)CO3 |
| Au | Gold | |
| Au | ⓘ Gold | Au |
Other Regions, Features and Areas containing this locality
North America
- Sonoran DesertDesert
North America PlateTectonic Plate
- Basin and Range BasinsBasin
- Mojave DomainDomain
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