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New finds out of Mexico - (10)
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Jean Sendero
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PostPosted: Jul 16, 2016 19:48    Post subject: Re: New finds out of Mexico - (10)  

What’s new in Mexico……I just realized that it’s been one year since I posted something in this column. May be because we did not see many really new finds coming out of Mexico or now that I am based out of Santiago Chile, I am further remote and not as much in the loop. Tom Moore, in the Mineralogical Record following the Tucson Show, reported new digging activities at some classic localities: Los Lamentos, Milpillas and the mention of kobyashevite from Mapimí. But over the past 6 months, I, and others, came across some very interesting finds, although small, these are mineralogically significant for Mexican localities.

At the time of the Tucson show in late January-early February, El Potosi mine in the West Camp at Santa Eulalia delivered some pale green adamite mixed with botryoidal looking smithsonite. The adamite is spectacularly fluorescent. Really amazing fluorescence. I am aware of at least three dealers marketing this material.



40 - El Potosi Sta Eulalia Chihuahua.jpg
 Mineral: Adamite with smithsonite
 Locality:
Potosí Mine, Santo Domingo (Francisco Portillo), Santa Eulalia District, Municipio Aquiles Serdán, Chihuahua, Mexico
 Dimensions: 7.5 x 7.5 cm
 Description:
 Viewed:  4553 Time(s)

40 - El Potosi Sta Eulalia Chihuahua.jpg


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Jean Sendero
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PostPosted: Jul 16, 2016 19:53    Post subject: Re: New finds out of Mexico - (10)  

It is not often that we see other minerals than chalcopyrite from the Bolivar mine in the Piedras Verde district. On occasion, it has yield some interesting specimens such as the cosalite find of late 2007, early 2008. The operation is currently mining the “El Gallo Superior” orebody and in April 2016, a small lot of approximately 25-30 specimens of datolite surfaced and are mainly miniature in size. Originally thought to be calcite, these were analyzed by Dr. Peter Megaw and confirmed to be datolite. The bladed disc shape morphology of the crystals is deceiving. Some specimens will have fine chalcopyrite dusted on top or as larger “chunks” at the back.


41 - Datolite El Bolivar Piedras Verdes Chihuahua.jpg
 Mineral: Datolite
 Locality:
El Bolivar Mine, El Gallo Superior orebody, Piedras Verdes (Triguito), Municipio Urique, Chihuahua, Mexico
 Dimensions: 4.5 x 3.5 x 2.8 cm
 Description:
 Viewed:  4583 Time(s)

41 - Datolite El Bolivar Piedras Verdes Chihuahua.jpg



42 - Datolite El Bolivar Piedras Verdes Chihuahua.jpg
 Mineral: Datolite
 Locality:
El Bolivar Mine, El Gallo Superior orebody, Piedras Verdes (Triguito), Municipio Urique, Chihuahua, Mexico
 Dimensions: 5.5 x 4.5 x 3.5 cm
 Description:
 Viewed:  4554 Time(s)

42 - Datolite El Bolivar Piedras Verdes Chihuahua.jpg


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Jean Sendero
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PostPosted: Jul 16, 2016 20:06    Post subject: Re: New finds out of Mexico - (10)  

More recently in June 2016, the Ojuela Mine at Mapimí delivered the unexpected. Due to the lack of rains, the water is exceptionally low in the mine and the miners have been able to access the deeper levels. We have seen over the past year a very small lot of gemmy looking small legrandite and more cerussite of much better quality than the ones from 2014. The cerussite is often associated with remnants of sulphides such as massive galena. So in mid-June of this years, the miners, while working on pisos 13 or 14 (aka levels 6 and 7) below the legrandite find, encountered a small pocket of sulphides. Approximately 100 specimens were produced ranging in size from miniature to small cabinet. The specimens consists of either 1) gun powder grey, simple modified cubes or spinel twins crystals of galena with little to good luster, some with a fine dusting of white carbonate or protruding masses of fine native silver and/or silver wires and 2) more complex lustrous crystals with associated arsenopyrite and fluorite and 3) nice purple partially gemmy fluorite forming cubes and modified cubes on which the carbonate matrix or remnant of arsenopyrite resides. I am told that the lot was split amongst three dealers.

Happy hunting. I have seen specimens from these finds on the market with the exception of the datolite.



43 - Cerussite Ojuela Mapimi Durango.jpg
 Mineral: Cerussite
 Locality:
Ojuela Mine, level 6, San Juan Poniente, Mapimí, Municipio Mapimí, Durango, Mexico
 Dimensions: 14 x 6 cm
 Description:
 Viewed:  4534 Time(s)

43 - Cerussite Ojuela Mapimi Durango.jpg



44 - Galena Ojuela Mapimi Durango.jpg
 Mineral: Galena
 Locality:
Ojuela Mine, Mapimí, Municipio Mapimí, Durango, Mexico
 Dimensions: 7 x 5 cm
 Description:
From piso 13-14, aka level 6 and 7
 Viewed:  4576 Time(s)

44 - Galena Ojuela Mapimi Durango.jpg



45 - Fluorite on Galena Ojuela Mapimi Durango.jpg
 Mineral: Fluorite on Galena
 Locality:
Ojuela Mine, Mapimí, Municipio Mapimí, Durango, Mexico
 Dimensions: 5 x 5 cm
 Description:
From piso 13-14, aka level 6 and 7
 Viewed:  4559 Time(s)

45 - Fluorite on Galena Ojuela Mapimi Durango.jpg



47 - Native silver galena Ojuela Mapimi Durango.JPG
 Mineral: Native silver on galena
 Locality:
Ojuela Mine, Mapimí, Municipio Mapimí, Durango, Mexico
 Dimensions: 5.5 x 5.5 x 3 cm
 Description:
From piso 13-14, aka level 6 and 7
 Viewed:  4652 Time(s)

47 - Native silver galena Ojuela Mapimi Durango.JPG



48 - Native silver galena fluorite arsenopyrite Ojuela Mapimi Durango.jpg
 Mineral: Native silver on galena
 Locality:
Ojuela Mine, Mapimí, Municipio Mapimí, Durango, Mexico
 Dimensions: 5.7 x 3.8 x 4.0 cm
 Description:
From piso 13-14, aka level 6 and 7
 Viewed:  4635 Time(s)

48 - Native silver galena fluorite arsenopyrite Ojuela Mapimi Durango.jpg



49 - Arsenopyrite on Galena Ojuela Mapimi Durango.jpg
 Mineral: Arsenopyrite on galena
 Locality:
Ojuela Mine, Mapimí, Municipio Mapimí, Durango, Mexico
 Dimensions: 5 x 3 x 3 cm
 Description:
From piso 13-14, aka level 6 and 7
 Viewed:  4601 Time(s)

49 -  Arsenopyrite on Galena Ojuela Mapimi Durango.jpg



50 - Fluorite with arsenopyrite Ojuela Mapimi Durango.jpg
 Mineral: Fluorite with arsenopyrite
 Locality:
Ojuela Mine, Mapimí, Municipio Mapimí, Durango, Mexico
 Dimensions: 5 x 5 cm
 Description:
From piso 13-14, aka level 6 and 7
 Viewed:  4546 Time(s)

50 - Fluorite with arsenopyrite Ojuela Mapimi Durango.jpg


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Tobi




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PostPosted: Jul 17, 2016 01:54    Post subject: Re: New finds out of Mexico - (10)  

Jean Sendero wrote:
Galena
Ojuela Mine, Mapimí, Municipio Mapimí, Durango, Mexico
7 x 5 cm
Very interesting structure. I love galena, it's one of my most favourite minerals, and I don't remember to have ever seen such a specimen from Ojuela Mine.
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PostPosted: Jul 17, 2016 07:11    Post subject: Re: New finds out of Mexico - (10)  

Tobi,

these are very new and nothing equal to these had surfaced before. Morphology and mineral associations are different from what we have seen from the higher part of the Ojuela where secondary minerals prevailed. These are from the deeper areas. The fluorite are seen with either a dusting of the white carbonate or with arsenopyrite. The galena can have the moderate luster grey gun powder color with a dusting of the white carbonate or have a better luster. They are then associated with fluorite arsenopyrite and on occasion native silver. I suspect, these associations, morphology, luster etc... is dependent if the specimens are from the top or bottom of the pocket.

Hope that more will come out as long that access to piso 13-14 (level 6-7) remains above the water table.

J
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PostPosted: Jul 17, 2016 07:38    Post subject: Re: New finds out of Mexico - (10)  

The cross section of the mine will give everyone a general idea of the depth of the new galena-fluorite-arsenopyrite-silver find occurred.


Min Rec Adapted Mapimi Cross Section.jpg
 Mineral: Galena Find
 Locality:
Ojuela Mine, Mapimí, Municipio Mapimí, Durango, Mexico
 Dimensions: NA
 Description:
MOORE, T. & MEGAW, P.K.M. (2003) The Ojuela Mine, Mapimí, Durango, Mexico. Mineralogical Record Vol. 34, No 5, p 31.
 Viewed:  4382 Time(s)

Min Rec Adapted Mapimi Cross Section.jpg


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Turbo




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PostPosted: Mar 23, 2018 07:11    Post subject: Re: New finds out of Mexico - (10)  

One of the more recent calcite twins from the Palmarejo Mine. Feb of last year was when I first began to see them at shows.

Ed Bayley



988C6436-337E-4090-86D1-2D226A0D4DAA.jpeg
 Mineral: Calcite, Palygorskite, Romanechite, Chalcophanite
 Locality:
Palmarejo Mine, Palmarejo, Municipio Chinipas, Chihuahua, Mexico
 Dimensions: 10.3x9.4x8.4cm
 Description:
 Viewed:  1665 Time(s)

988C6436-337E-4090-86D1-2D226A0D4DAA.jpeg



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Brent Lockhart




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PostPosted: Mar 25, 2018 00:37    Post subject: Re: New finds out of Mexico - (10)  

Does anyone have information on the associated minerals seen with the recent batch of Legrandites from the Ojuela Mine?
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