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Platosa Mine, Bermejillo, Mapimí Municipality, Durango, Mexicoi
Regional Level Types
Platosa MineMine
Bermejillo- not defined -
Mapimí MunicipalityMunicipality
DurangoState
MexicoCountry

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Key
Latitude & Longitude (WGS84):
25° 55' 38'' North , 103° 39' 29'' West
Latitude & Longitude (decimal):
Owned/operated by:
Locality type:
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
La Sierrita128 (2014)3.9km
Bermejillo9,149 (2018)5.9km
San José de Bellavista607 (2018)8.5km
Veintidós de Febrero768 (2018)10.3km
La Esperanza275 (2018)10.5km
Name(s) in local language(s):
Mina la Platosa, Bermejillo, Municipio Mapimi, Durango, Mexico


Platosa is a typical Mexican Carbonate Replacement Deposit lying approximately 5 km northwest of the town of Bermejillo, Durango. Platosa lies on the northeast flank of the Sierra Bermejillo, less than 2 km off the Pan American Highway. Although it is in the Municipality of Mapimí it has no apparent relationship to the Ojuela Mine area of the Mapimí District.

The historic workings of the Platosa Mine are a series of flat-lying stopes, connected by tabular open zones developed along NW-SE faults and fractures. The deposit was found in outcrop, probably in the mid-1600s when Ojuela was just getting started and early mining focused on very high-grade oxidized silver-lead-zinc-copper ores. Mineralogically, these ores consisted dominantly of argentiferous cerussite and anglesite, with some remnant galena) and probably at least trace chlorargyrite. The oxides also contain small amounts of schulenbergite, orthoserpierite, malachite, linarite, and serpierite.

Post-mineral ground-water movement along the NW-SE faults dissolved large open caverns up to 8 m wide, 30 m high and 250 m long. These contain very large gypsum crystals...to 2.5 m long, often characterized by dark brown to black phantoms of organic material. Many also show pale yellow-white phantoms under SWUV, probably also reflecting included organic materials. A fair number of these gypsum crystals are partially encrusted with hydrozincite and a small number are studded with light blue rice-grain smithsonites to 4 mm. Many gypsum specimens from Platosa have been misattributed to Naica... the fluorescent phantoms are diagnostic, however.

Sulfur isotope analyses indicate that the gypsum in the crystals is derived from gypsum-rich evaporite deposits that lie deep in the local stratigraphic section. Field relations and extensive collapse breccias indicate that the deep gypsums were dissolved to form large caverns that ultimately collapsed creating breccia chimneys that subsequent fluids... themselves dissolving gypsum... followed and partially to completely filled with gypsum.

In 1997, exploration drilling by Excellon Resources found the unoxidized faulted continuations of the Platosa mantos essentially just below cover at the base of the mountain. These mantos have been proven to contain over 1 million tonnes of very high-grade silver-lead-zinc mineralization in the form of massive galena, sphalerite, acanthite and minor pyrite with trace copper sulfosalts. In the 5 Manto, silver grades locally exceeded 2% silver in areas rich in proustite. Proustite crystals to 1 cm in diameter and 3 cm long were found, many encased in limpid crystalline gypsum. Barite and celestine are locally abundant with clear evidence of galena replacing celestine in several places.

There are a multitude of celestine and barite showings throughout the Sierra Bermejillo, the majority forming as infillings of collapsed caverns. Most have been prospected and produced, although little specimen-quality material has been found. The cross-cutting relationships indicate the celesto-barite mineralization was early, formed from brines expelled from the nearby Central Mexico Basin. The silver-lead-zinc mineralization is clearly younger, probably forming in the mid-Tertiary.

Other oxidized metallic deposits occur in the area, some with adamite, mimetite, wulfenite, and copper oxide species.

The 2015 Excellon PEA for Platosa says: Gypsum occurs as fairly late stage fracture-fillings and veins throughout the district. Collector quality
gypsum crystals have been extracted from open fractures in the historic Platosa Mine, and are what originally led Excellon to the property. The gypsum commonly cuts across mantos and cements large areas of sulphide breccia. Crystalline gypsum, containing extremely fine-grained inclusions of galena dust, is often found tens of metres from these breccias and is a reliable indicator of proximity to coherent sulphides. Cross-cutting relationships and sulphur isotopic analyses indicate that the gypsum is probably not genetically related to the mineralizing event but is most likely derived from the solution and reprecipitation of gypsum derived from the underlying Acatita Formation evaporates.

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


22 valid minerals.

Detailed Mineral List:

Acanthite
Formula: Ag2S
Reference: Origlieri, unpub
Anglesite
Formula: PbSO4
Reference: Origlieri, unpub
Baryte
Formula: BaSO4
Reference: Origlieri, unpub
Calcite
Formula: CaCO3
Reference: Origlieri, unpub
Celestine
Formula: SrSO4
Reference: Origlieri, unpub
Cerussite
Formula: PbCO3
Reference: Origlieri, unpub
Chalcopyrite
Formula: CuFeS2
Reference: Origlieri, unpub
Dolomite
Formula: CaMg(CO3)2
Reference: Origlieri, unpub
Fluorite
Formula: CaF2
Reference: Origlieri, unpub
Galena
Formula: PbS
Reference: Origlieri, unpub
Gypsum
Formula: CaSO4 · 2H2O
Reference: email to Rob Lavinsky from Peter McGaw 2009
Gypsum var: Selenite
Formula: CaSO4 · 2H2O
Reference: C. Lemanski collection (7039CL).
Hydrozincite
Formula: Zn5(CO3)2(OH)6
Reference: C. Lemanski collection (7039CL).
Linarite
Formula: PbCu(SO4)(OH)2
Reference: Origlieri, unpub
Orthoserpierite
Formula: Ca(Cu,Zn)4(SO4)2(OH)6 · 3H2O
Reference: Origlieri, unpub
Proustite
Formula: Ag3AsS3
Reference: email to Rob Lavinsky from Peter McGaw 2009
Pyrite
Formula: FeS2
Reference: Origlieri, unpub
Quartz
Formula: SiO2
Reference: Origlieri, unpub
Schulenbergite
Formula: (Cu,Zn)7(SO4)2(OH)10 · 3H2O
Reference: Mineralogical Record (2003) 34:5 The Ojuela Mine
Serpierite
Formula: Ca(Cu,Zn)4(SO4)2(OH)6 · 3H2O
Reference: Mineralogical Record (2003) 34:5 The Ojuela Mine
Silver
Formula: Ag
Reference: Origlieri, unpub
Smithsonite
Formula: ZnCO3
Reference: C. Lemanski collection (7039CL).
Sphalerite
Formula: ZnS
Reference: Origlieri, unpub

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Silver1.AA.05Ag
Group 2 - Sulphides and Sulfosalts
Acanthite2.BA.35Ag2S
Chalcopyrite2.CB.10aCuFeS2
Galena2.CD.10PbS
Proustite2.GA.05Ag3AsS3
Pyrite2.EB.05aFeS2
Sphalerite2.CB.05aZnS
Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Cerussite5.AB.15PbCO3
Dolomite5.AB.10CaMg(CO3)2
Hydrozincite5.BA.15Zn5(CO3)2(OH)6
Smithsonite5.AB.05ZnCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Anglesite7.AD.35PbSO4
Baryte7.AD.35BaSO4
Celestine7.AD.35SrSO4
Gypsum7.CD.40CaSO4 · 2H2O
var: Selenite7.CD.40CaSO4 · 2H2O
Linarite7.BC.65PbCu(SO4)(OH)2
Orthoserpierite7.DD.30Ca(Cu,Zn)4(SO4)2(OH)6 · 3H2O
Schulenbergite7.DD.80(Cu,Zn)7(SO4)2(OH)10 · 3H2O
Serpierite7.DD.30Ca(Cu,Zn)4(SO4)2(OH)6 · 3H2O

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Silver1.1.1.2Ag
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Acanthite2.4.1.1Ag2S
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 3 - SULFOSALTS
ø = 3
Proustite3.4.1.1Ag3AsS3
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Cerussite14.1.3.4PbCO3
Smithsonite14.1.1.6ZnCO3
AB(XO3)2
Dolomite14.2.1.1CaMg(CO3)2
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Hydrozincite16a.4.1.1Zn5(CO3)2(OH)6
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Anglesite28.3.1.3PbSO4
Baryte28.3.1.1BaSO4
Celestine28.3.1.2SrSO4
Group 29 - HYDRATED ACID AND NORMAL SULFATES
AXO4·xH2O
Gypsum29.6.3.1CaSO4 · 2H2O
Group 30 - ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
(AB)2(XO4)Zq
Linarite30.2.3.1PbCu(SO4)(OH)2
Group 31 - HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
(AB)m(XO4)pZq·xH2O, where m:p > 6:1
Schulenbergite31.1.6.1(Cu,Zn)7(SO4)2(OH)10 · 3H2O
(AB)5(XO4)2Zq·xH2O
Orthoserpierite31.6.7.1Ca(Cu,Zn)4(SO4)2(OH)6 · 3H2O
Serpierite31.6.2.1Ca(Cu,Zn)4(SO4)2(OH)6 · 3H2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
Gypsum
var: Selenite
-CaSO4 · 2H2O

List of minerals for each chemical element

HHydrogen
H Gypsum (var: Selenite)CaSO4 · 2H2O
H HydrozinciteZn5(CO3)2(OH)6
H SerpieriteCa(Cu,Zn)4(SO4)2(OH)6 · 3H2O
H Schulenbergite(Cu,Zn)7(SO4)2(OH)10 · 3H2O
H GypsumCaSO4 · 2H2O
H OrthoserpieriteCa(Cu,Zn)4(SO4)2(OH)6 · 3H2O
H LinaritePbCu(SO4)(OH)2
CCarbon
C SmithsoniteZnCO3
C HydrozinciteZn5(CO3)2(OH)6
C CerussitePbCO3
C CalciteCaCO3
C DolomiteCaMg(CO3)2
OOxygen
O Gypsum (var: Selenite)CaSO4 · 2H2O
O SmithsoniteZnCO3
O HydrozinciteZn5(CO3)2(OH)6
O SerpieriteCa(Cu,Zn)4(SO4)2(OH)6 · 3H2O
O Schulenbergite(Cu,Zn)7(SO4)2(OH)10 · 3H2O
O GypsumCaSO4 · 2H2O
O OrthoserpieriteCa(Cu,Zn)4(SO4)2(OH)6 · 3H2O
O LinaritePbCu(SO4)(OH)2
O CelestineSrSO4
O BaryteBaSO4
O AnglesitePbSO4
O CerussitePbCO3
O CalciteCaCO3
O QuartzSiO2
O DolomiteCaMg(CO3)2
FFluorine
F FluoriteCaF2
MgMagnesium
Mg DolomiteCaMg(CO3)2
SiSilicon
Si QuartzSiO2
SSulfur
S Gypsum (var: Selenite)CaSO4 · 2H2O
S SerpieriteCa(Cu,Zn)4(SO4)2(OH)6 · 3H2O
S Schulenbergite(Cu,Zn)7(SO4)2(OH)10 · 3H2O
S ProustiteAg3AsS3
S GypsumCaSO4 · 2H2O
S OrthoserpieriteCa(Cu,Zn)4(SO4)2(OH)6 · 3H2O
S LinaritePbCu(SO4)(OH)2
S CelestineSrSO4
S BaryteBaSO4
S GalenaPbS
S SphaleriteZnS
S AcanthiteAg2S
S PyriteFeS2
S ChalcopyriteCuFeS2
S AnglesitePbSO4
CaCalcium
Ca Gypsum (var: Selenite)CaSO4 · 2H2O
Ca SerpieriteCa(Cu,Zn)4(SO4)2(OH)6 · 3H2O
Ca GypsumCaSO4 · 2H2O
Ca OrthoserpieriteCa(Cu,Zn)4(SO4)2(OH)6 · 3H2O
Ca CalciteCaCO3
Ca FluoriteCaF2
Ca DolomiteCaMg(CO3)2
FeIron
Fe PyriteFeS2
Fe ChalcopyriteCuFeS2
CuCopper
Cu SerpieriteCa(Cu,Zn)4(SO4)2(OH)6 · 3H2O
Cu Schulenbergite(Cu,Zn)7(SO4)2(OH)10 · 3H2O
Cu OrthoserpieriteCa(Cu,Zn)4(SO4)2(OH)6 · 3H2O
Cu LinaritePbCu(SO4)(OH)2
Cu ChalcopyriteCuFeS2
ZnZinc
Zn SmithsoniteZnCO3
Zn HydrozinciteZn5(CO3)2(OH)6
Zn SerpieriteCa(Cu,Zn)4(SO4)2(OH)6 · 3H2O
Zn Schulenbergite(Cu,Zn)7(SO4)2(OH)10 · 3H2O
Zn OrthoserpieriteCa(Cu,Zn)4(SO4)2(OH)6 · 3H2O
Zn SphaleriteZnS
AsArsenic
As ProustiteAg3AsS3
SrStrontium
Sr CelestineSrSO4
AgSilver
Ag ProustiteAg3AsS3
Ag SilverAg
Ag AcanthiteAg2S
BaBarium
Ba BaryteBaSO4
PbLead
Pb LinaritePbCu(SO4)(OH)2
Pb GalenaPbS
Pb AnglesitePbSO4
Pb CerussitePbCO3

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Megaw and Ramirez (2010) Geologia Economica de Mexico: Clark, K.F., and others, editors. Servicio Geologico Mexicano Publication.
Cox, J.J., Ross, D., and Michaud, R.L. (2015) Technical Report on the Preliminary Economic Assessment of the Platosa Mine, Durango State, Mexico. Excellon Resources Limited website under Technical Reports.


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