Unnamed prospects west of Black Hawk Mine, Cincinnati vein system, Mahoney Mines area, Tres Hermanas Mining District, Tres Hermanas Mountains, Luna County, New Mexico, USAi
| Regional Level Types | |
|---|---|
| Unnamed prospects west of Black Hawk Mine | Mine |
| Cincinnati vein system | - not defined - |
| Mahoney Mines area | Area |
| Tres Hermanas Mining District | Mining District |
| Tres Hermanas Mountains | Mountain Range |
| Luna County | Shaft (Reclaimed) |
| New Mexico | State |
| USA | Country |
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Latitude & Longitude (WGS84):
31° 54' 30'' North , 107° 46' 19'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Columbus | 1,625 (2017) | 15.4km |
| Puerto Palomas | 5,659 (2015) | 19.5km |
| Sunshine | 420 (2011) | 25.6km |
| La Hacienda | 725 (2017) | 33.4km |
| Pulpotio Bareas | 120 (2017) | 34.4km |
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 |
|---|---|---|
| Deming Gem & Mineral Society | Deming, New Mexico | 40km |
Several (unnamed) prospects are located on the northwest-trending ridge of Lower Cretaceous sediments about one-half mile west of the Black Hawk truck road that crosses an arroyo northwest of the mine and then continues westward to the base of the ridge.
The ridge is bounded on the northeast and southwest by faults striking N. 40°-50° W. and is completely surrounded by alluvium. The interpretation of the movement along these two faults is difficult. Although the relative movement shown on these faults in Plate 1 appears to be the most logical, it may be in error.
The Lower Cretaceous sediments exposed here consist of alternating beds of massive cobble conglomerates, shale, and gray to dark-gray medium-bedded limestones. The conglomerates are composed of well-rounded cobbles, as much as 8 inches in diameter, of varying types of carbonate rocks, presumably derived from the erosion of earlier Cretaceous and Paleozoic limestone units. In the unaltered beds the interstitial material cementing the cobbles is composed almost entirely of calcite; little quartz is present.
The sediments, particularly the conglomerates, have been strongly silicified in many areas. The silicification appears to have been related to the northwest faulting, as the alteration zones are generally elongated parallel to the fault direction. There is also considerable evidence of recrystallization of the limestone beds.
The general attitude of the sediments strikes northwest with dips ranging from 30 to 60 degrees to the southwest. Numerous dip reversals are present along the ridge, particularly on the southwest side. More detailed examination of the area is required to explain these reversals.
The known ore mineralization within the Cretaceous rocks is limited to deposits of the vein type. Most of the veins strike east to northeast, but one vein, located on the west end of the ridge, strikes north. The veins commonly contain abundant iron and manganese oxides, calcite, and quartz, accompanied by only minor amounts of "oxidized" lead, zinc, and copper minerals. The veins have been prospected to only shallow depths, and the nature of the primary ores is not known.
Probably the best ore was developed from the north-trending vein on the west end of the ridge. The dumps of the shaft at this prospect have a moderate amount of porous, highly oxidized vein material containing some cerussite and smithsonite.
At depth, some of the veins may yield workable deposits, but the exposures now visible give little promise of economic exploitation.
The ridge is bounded on the northeast and southwest by faults striking N. 40°-50° W. and is completely surrounded by alluvium. The interpretation of the movement along these two faults is difficult. Although the relative movement shown on these faults in Plate 1 appears to be the most logical, it may be in error.
The Lower Cretaceous sediments exposed here consist of alternating beds of massive cobble conglomerates, shale, and gray to dark-gray medium-bedded limestones. The conglomerates are composed of well-rounded cobbles, as much as 8 inches in diameter, of varying types of carbonate rocks, presumably derived from the erosion of earlier Cretaceous and Paleozoic limestone units. In the unaltered beds the interstitial material cementing the cobbles is composed almost entirely of calcite; little quartz is present.
The sediments, particularly the conglomerates, have been strongly silicified in many areas. The silicification appears to have been related to the northwest faulting, as the alteration zones are generally elongated parallel to the fault direction. There is also considerable evidence of recrystallization of the limestone beds.
The general attitude of the sediments strikes northwest with dips ranging from 30 to 60 degrees to the southwest. Numerous dip reversals are present along the ridge, particularly on the southwest side. More detailed examination of the area is required to explain these reversals.
The known ore mineralization within the Cretaceous rocks is limited to deposits of the vein type. Most of the veins strike east to northeast, but one vein, located on the west end of the ridge, strikes north. The veins commonly contain abundant iron and manganese oxides, calcite, and quartz, accompanied by only minor amounts of "oxidized" lead, zinc, and copper minerals. The veins have been prospected to only shallow depths, and the nature of the primary ores is not known.
Probably the best ore was developed from the north-trending vein on the west end of the ridge. The dumps of the shaft at this prospect have a moderate amount of porous, highly oxidized vein material containing some cerussite and smithsonite.
At depth, some of the veins may yield workable deposits, but the exposures now visible give little promise of economic exploitation.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsMineral List
4 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 |
| ⓘ Cerussite Formula: PbCO3 |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Smithsonite Formula: ZnCO3 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| ⓘ | Smithsonite | 5.AB.05 | ZnCO3 |
| ⓘ | Cerussite | 5.AB.15 | PbCO3 |
List of minerals for each chemical element
| C | Carbon | |
|---|---|---|
| C | ⓘ Calcite | CaCO3 |
| C | ⓘ Cerussite | PbCO3 |
| C | ⓘ Smithsonite | ZnCO3 |
| O | Oxygen | |
| O | ⓘ Calcite | CaCO3 |
| O | ⓘ Cerussite | PbCO3 |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Smithsonite | ZnCO3 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| Ca | Calcium | |
| Ca | ⓘ Calcite | CaCO3 |
| Zn | Zinc | |
| Zn | ⓘ Smithsonite | ZnCO3 |
| Pb | Lead | |
| Pb | ⓘ Cerussite | PbCO3 |
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Basin and Range BasinsBasin
- Mazatzal DomainDomain
- Sierra Madre OrientalWide Rift
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