Mojina Mine, Rancho de Mojina, Ricardo Flores Magón, Buenaventura Municipality, Chihuahua, Mexicoi
| Regional Level Types | |
|---|---|
| Mojina Mine | Mine |
| Rancho de Mojina | - not defined - |
| Ricardo Flores Magón | - not defined - |
| Buenaventura Municipality | Municipality |
| Chihuahua | State |
| Mexico | Country |
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Latitude & Longitude (WGS84):
29° 54' 7'' North , 106° 51' 14'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| La Constitución | 2,709 (2018) | 5.9km |
| San Lorenzo | 806 (2018) | 23.5km |
| Ejido Benito Juárez | 5,778 (2013) | 27.6km |
| Las Playas | 214 (2014) | 39.9km |
| San Lorencito | 184 (2014) | 44.7km |
Mindat Locality ID:
16461
Long-form identifier:
mindat:1:2:16461:1
GUID (UUID V4):
391a52c6-39a0-42f3-880e-ad6bb6b931ea
Panczner (1987) places the locality in Ejido Constitucion, Municipio de Ahumada...but the locality is actually in Municipio de Buenaventura, the next Municipio to the west. Constitucion is very small (<300 inhabitants) and town of Ricardo Flores Magon (>3000 inhabitants) is only a few kilometres farther away and readily locatable on worldwide maps. Access to the mine is strictly controlled by the property owner from either Constitucion or Ricardo Flores Magon.
Mina Mojina (The Mojina Mine) is a classic carbonate replacement deposit that lies about 2/3rds of the way between Santa Eulalia and San Pedro Corralitos in north-central Chihuahua. It sits about 100km west of Villa Ahumada. Mojina produced high-grade oxide lead-silver-zinc ores with minor gold and tellurium from mantos located on the upper and lower contacts of a felsic sill. The mine intersected a series of caverns lined with calcite...most were the "popcorn" like growths. Rarer were pockets lined with "cobra-calcite" ...well crystallized calcite with distinctive curved rhombs up to 3-4 cm across that look like upright cobras with their hoods spread. Some of these have sharp blue celestine crystals on them...Never a big mine, it might have produced 100,000 tonnes.
Benny Fenn brought very large quantities of specimens out of the mine in the late 1960s, selling most through Suzie Davis in Tucson (Benny Fenn, personal communication). Virtually nothing has emerged since given difficulty of surface access.
Note that although there are naturally lustrous calcite specimens from the locality, many have been washed with hydrochloric acid to remove an outer fine-grained layer of "dusty" matte luster calcite and give them a glossier luster. These latter can best be identified by looking for patches of matte luster or examining the point of attachment to see if the edges are rounded or if what should be sharp cleavage planes are etched.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Formula: CaCO3 Description: Tested "aragonites" prove to be calcite. References: |
| ⓘ Calcite Formula: CaCO3 Description: Shows a variety of habits ranging from speleothem "popcorn" to distinctive "cobra" crystals characterized by flattened curved rhombohedra that tend to get larger farther out from their base, giving an appearance like a cobra with its hood extended. All habits of calcite are commonly locally studded with minute light to deep blue celestine crystals. References: |
| ⓘ Celestine Formula: SrSO4 References: |
| ⓘ Goethite Formula: α-Fe3+O(OH) References: |
| ⓘ Jarosite Formula: KFe3+3(SO4)2(OH)6 Colour: yellow-brown Description: Very coarse-grained massive jarosite is common on the dumps at Mojina. Cleavage faces to .5 cm are common. Breccias of angular limestone fragments cemented by jarosite are common. (See image) |
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Goethite | 4.00. | α-Fe3+O(OH) |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| ⓘ | Aragonite ? | 5.AB.15 | CaCO3 |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| ⓘ | Celestine | 7.AD.35 | SrSO4 |
| ⓘ | Jarosite | 7.BC.10 | KFe3+3(SO4)2(OH)6 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Goethite | α-Fe3+O(OH) |
| H | ⓘ Jarosite | KFe33+(SO4)2(OH)6 |
| C | Carbon | |
| C | ⓘ Aragonite | CaCO3 |
| C | ⓘ Calcite | CaCO3 |
| O | Oxygen | |
| O | ⓘ Aragonite | CaCO3 |
| O | ⓘ Calcite | CaCO3 |
| O | ⓘ Celestine | SrSO4 |
| O | ⓘ Goethite | α-Fe3+O(OH) |
| O | ⓘ Jarosite | KFe33+(SO4)2(OH)6 |
| S | Sulfur | |
| S | ⓘ Celestine | SrSO4 |
| S | ⓘ Jarosite | KFe33+(SO4)2(OH)6 |
| K | Potassium | |
| K | ⓘ Jarosite | KFe33+(SO4)2(OH)6 |
| Ca | Calcium | |
| Ca | ⓘ Aragonite | CaCO3 |
| Ca | ⓘ Calcite | CaCO3 |
| Fe | Iron | |
| Fe | ⓘ Goethite | α-Fe3+O(OH) |
| Fe | ⓘ Jarosite | KFe33+(SO4)2(OH)6 |
| Sr | Strontium | |
| Sr | ⓘ Celestine | SrSO4 |
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
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References
