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Posted by Pedro Alves  
Pedro Alves February 23, 2012 07:31PM
i'm proposing here to change the following locality:
to 'Cubos mine, Mesquitela-Mangualde, Mangualde, Viseu, Portugal.

In the details:
Cubos mine, C-34

Opinions are wellcome.

Pedro Alves
Pedro Alves February 23, 2012 10:43PM
Hello again.
Guidelines and a brief explanation are needed, i think.

We have, in that area, two mines:
Cubos and Chão do castanheiro.
Cubos was a Be and Li mine opened at 30-04-1936 in Mangualde, Mangualde, Viseu, Portugal.
Chão do Castanheiro was a Be, Li, W, Sn and Ta mine. Opened in Mesquitela, Mangualde, Viseu... At 14-05-1935.

The 'new' and actual Cubos is half Cubos and half Chão do Castanheiro.

The publications we know for phosphates et al usually refer to an area between Mesquitela and Mangualde, where we have the two old mines.
To be acurate, the most part came out from Chão do Castanheiro (well know for some collectors. where the facilities and the ofices are located).

My proposal is to change the actual locality (in the first message) to a comprehensiva and actual area. In the details we can talk about the two precedent mines and the most probable source (Chão do Castanheiro).

I've some specimens from that area. I've found them myself in the dumps at Chão do Castanheiro. I'm sure about the provenience. Even if the mine no longer exists and we have another one in the same place (more or less - a half part), the samples were extracted at the time of the first mine.
For that, i think it's logic to catalogue my samples as belonging to Chão do Castanheiro.
For imprecise samples we have the overall locality (Cubos C-34)

Hope this help.

Pedro Alves
Luís Martins February 27, 2012 09:28PM
I'm against the changes you propose because:
-dumps at the processing plant near Mesquitela, at Chão do Castanheiro, are from the entire pegmatite unit, exploited in the two aforementioned claims, and not only from Chão do Castanheiro;
-the statement " the most part came out from Chão do Castanheiro" is an over-simplification: in fact the works are widespread trough the Mesquitela pegmatite, and the most part of them are in the border between Chão do Castanheiro and Cubos (personal communication several years ago from the owner of the claims); the main occurences of the famous phosphates are, in fact, in the middle of Chão do Castanheiro claim, but by no chance subscribed to that specific area;
-collecting at the Chão do Castanheiro dumps is no warranty of the provenience of the specimen: the ore from Cubos was also processed at Chão do Castanheiro, and mixing between the ore from the two claims was made to enhance some characteristics.

There are some (although small) other occurrences nearby, including some extremely interesting pegmatites containing trace amounts of the minerals present in the main pegmatite dike. Also, an old quarry nearby provided some quartz crystals, from a milky quartz vein (oral communication from a defunct dealer). A road-cut nearby (not in the concessions immediate proximity) is cited as source of medium quality specimens of staurolite.

In my opinion, the "Cubos-Mesquitela-Mangualde area" should be maintained, and this specific mining claim should be in a sub-level of this, given the uncertainty of the provenance of specimens from the dump, and the other occurrences linked to the main one.

Best regards, Luís Martins.
Pedro Alves February 27, 2012 11:00PM
Hello Luis,

Pedro Alves said:
«My proposal is to change the actual locality (in the first message) to a comprehensive and actual area. In the details we can talk about the two precedent mines...»
the precedent mines are Cubos and Chão do Castanheiro.

Pedro Alves again:
«The 'new' and actual Cubos is half Cubos and half Chão do Castanheiro...»
there is an image where we can see that.
This is for the phosphates, mainly, ocurrences.
open | download - mesquitela.jpg (665.4 KB)
Luís Martins February 27, 2012 11:24PM
Sorry, I've missed the "In the details we can talk about the two precedent mines..." in my reading. So, what do you propose is t maintain the area name, and add specific localities inside it? If so, only the 2 claims, or the zones described by Amilcar de Jesus?
Just a small adenda: the mining facilities are located at Regada (popular name, and also a small farm adjacent), not at Chão do Castanheiro "popular toponymy spot". It is in fact located inside the Chão do Castanheiro claim, but the name of the claim is derived of the place of the first pit digged in the pegmatite, at the top of the small hill on the other side of the road.
Anyway, I didn't understood you well, and I'm sorry for that. An amazing locality such as this deserve a better place here in Mindat.
Best regards, Luís Martins.
Rui Nunes February 27, 2012 11:42PM
And why not transfer once and for all these questions to our forum?
I think that our issues should in the first (or in the last) instance be discussed among us.
And because nobody wants protagonism our positions often diverge but should be seized...
Sincerely, RN
Pedro Alves February 27, 2012 11:49PM
we have minerals like Zodacite, Rittmanite and Jahnsite (CaMnMn) with a LT poorly descrived.
The 'new' Cubos is probably an inprovement for the provenience accuracy.
In my opinion:
Cubos mine, Mangualde-Mesquitela, Viseu, Portugal. With C-34 in the description with mention of the 'old' Cubos and Chão do castanheiro partial agglutination.
is a good way.
And the two other locations as sub-localities:
Cubos and Chão do Castanheiro.

That for the 'phosphates'.

There are, of course, many other nice and important ocurrences at Mangualde with no relation with Cubos.

Chão do Castanheiro is the oficial name, and the facilities (in the picture above) are inside the mine area.

Pedro Alves February 27, 2012 11:51PM
this topic is already in the Portuguese forum...

Sorry, only registered users may post in this forum.

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