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Firmeza District, Santiago de Cuba Province, Cuba
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Manganite
Firmeza District, Santiago de Cuba Province, Cuba

Photo: Don Volkman 01/06
 
 
AIME Abstract
The ore deposits at Firmeza have been worked continuously since 1884; those at Daiquiri since 1895. It is surprising, therefore, that they have not been the object of careful geologic study until quite recently. It is true that considerable attention was paid to these deposits by A. C. Spencer, in 1901, in the report on the geology of Cuba, by Hayes, Vaughan, and Spencer,l but this was only incidental to a hasty general reconnaissance of the Island. As far as the Daiquiri deposits are concerned, this gap has been filled by the appearance of the two papers by Prof. James F. Kemp2 and by Prof. Waldemar Lindgren and Clyde P. Ross respectively.3 Max Roesler, first holder of the Emmons fellowship, made a detailed study of the Firmeza deposits during the past summer [~1915], so that soon we can expect a full description of them. Consequently, there is no, demand at the present time for a description of the deposits from other sources, and that is not the purpose of this paper. The papers on Daiquiri, however, leave unsolved problems in regard to the age of the rocks of the district and certain phases of the genesis of the deposits, and it is with the hope of aiding in the solution of some of these problems that this contribution is offered. Kemp, and Lindgren and Ross agree in assigning these deposits to the type of contact metamorphic deposits. They disagree in part on the question of their localization. The deposits occur in an extensive area of diorite which includes numerous blocks of limestone, and sometimes are found in the contact zones between these blocks and the diorite, and in other instances are completely enveloped in the diorite, showing no apparent connection with the limestone.

Mineral List

Mineral list contains entries from the region specified including sub-localities
Actinolite
Albite
var: Andesine

Andradite
Anorthite
var: Bytownite

var: Labradorite
Baryte
Calcite
Chalcopyrite
'Chlorite Group'
Copper
Epidote
Fluorapatite
Hematite
var: Specularite
'Hornblende'
Kaolinite
'K Feldspar'
Magnetite
'Manganese Oxides'
Manganite
Muscovite
var: Sericite

Neotocite
Orientite (TL)
Pyrite
Pyrolusite
Quartz
Ranciéite
Romanèchite
'Scapolite'
Titanite
Todorokite
Wollastonite


50 entries listed. 22 valid minerals. 1 type locality (valid mineral).

Localities in this Region

Cuba
Cuba

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Current server date and time: September 23, 2014 18:21:54 Page generated: July 21, 2014 18:54:58
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