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In order to identify presence of the elements that belonging to the rare earth and the platinum group in the extraction process of nickel and cobalt from Commander Ernesto Che Guevara Cuban enterprise, samples were taken in different sections of the technological scheme. For the sample selection that was studied, were taken into account those process points where the material has undergone physical and / or chemical transformations. For the chemical characterization the following analytical methods were used: in the case of rare earths, lithium borate fusión, followed by measurement by optical ICP for major oxides, and trace elements by mass ICP; using the concentration by fire test with nickel sulphide for those of the platinum group, with the subsequent measurement by neutron activation. It was obtained that the scandium is majority element and that the technology does not extract rare elements and platinoids, passing these in greater quantity to the solid residue of the process. [ABSTRACT FROM AUTHOR]

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The metallogenic studies carried out revealed three mining districts with deposits of metallurgic and refractory chromite, with or without platinoides associated to the Mayarí-Baracoa Ophiolitic Belt, and three sectors with gold-silver, copper-lead-zinc and copper-pyritic mineralizations, associated to the cretacic island arcs. The chromitite bodies of the Moa-Baracoa district are rich in refractory chromite and structurally they are located in the Mantle-Crust Transition Zone; the main associated lithologies are ultramafic and gabroide bodies. The chromitite of the Mayarí district are constituted by chromite metallurgic bodies, and are structurally located in the deepest levels in the upper mantle. These bodies are associated to the harzburgite of the tectonite complex. The chromitite bodies of the Sagua de Tánamo district possess chromites of both types. The Cretacic Island Arc of the possesses a highly variable metallogeny, which is characterized by the presence of gold-silver, copper-lead-zinc and copper-pyritic manifestations. They are all associated to diabase, andesite and tholeitic basalts of the backarc and forearc zones; the latter possesses a boninitic tendency. Lastly, it is necessary to highlight the rich exogenous metallogeny of the region, characterized by the presence of marine-coastal, eluvials and alluvial placers, with such minerals of economic interest as magnetite, chromite, illmenite, gold and platinum group minerals. [ABSTRACT FROM AUTHOR]

This article exposes results of researches developed on chromitite ore deposit Potosí, located to the east of Moa, Cuba, and in the disemination of chrome ores, the spinels chromite in the dike of gabbro-pegmatites and the minerals connected to the principal mineralization. In the investigations developed differents methods of ore microscopy were included --the dispersion of the capacity of reflection, isotropy- anisotropy, microhardeness, internal reflection-- and analysis of scanning electron microscopy; which permitted a high of accuracy of the identification of the main mineralogical phases and connecting minerals. The main results of this work were: a) platinum group minerals: it represent by sulfides phases of ruthenium and osmium: Ru2S - Os2S; b) rutile: TiO2; c) magmatic sulfides minerals: pentlandite, pyrrhotite, chalcopyrite and millerite, agreeable with isotopic analyses, performed by Proenza (Proenza, J., 1998) and d) tipic sulfides of serpentination process: mackinawita and heazlewoodite. Ending, the minerals paragenetic sequence in chronological order are showed. [ABSTRACT FROM AUTHOR]