Abstract

PEREZ-VAZQUEZ, Ramón Guillermo  and  MARTIN-LAGO, Roniel. Evaluation of precious metals (Au and Ag) at the oxidation zone northwest of Artemisa (Cuba). Bol. geol. [online]. 2021, vol.43, n.1, pp.127-146.  Epub Jan 01, 2021. ISSN 0120-0283.  https://doi.org/10.18273/revbol.v43n1-2021006.

Determination of specific precious metal (Au and Ag) contents in the oxidation, hydrothermal alteration and shear zones present at the Bahía Honda metallogenic zone, northwest of Artemisa, was the primary aim of the research. Most of these areas are located on and around the deposits and/or cupro – sulphurous target that extend from the Cajálbana massif to the west to Buena Vista to the east. The main reason for undertaking this task has been the growing interest it has had in Cuba, based on discoveries and assimilation of gold deposits in oxidation zones (gossan), sedex, VMS and epithermal sulfide deposits, among which there are Oro Castellanos, Cobre Mantua, Loma de Hierro and Golden Hill in addition to the vast majority of Cuba’s copper and base metal deposits, they are carriers of Au and Ag.

Methodology was based on carrying out geological itineraries, sampling and documentation of the main outcrops and samples obtained during drilling, in addition to the analysis and reinterpretation of geophysical and geochemical information from previous work carried out in the area. The samples were analyzed in the laboratory “José Isaac del Corral” (LACEMI), determining by means of combined analysis of docimasy with atomic absorption spectrometry the contents of Au and Ag. Chemical analysis was also performed by inductively coupled plasma with plasma inductively coupled (ICP – MS) to a group of accompanying elements.

As a result of these works, it was possible to determine the presence of significant values of Au in all the prospects evaluated, ranging between 0.05 – 2.24 g/t, which allowed the calculation of hypothetical resources. Silver concentration values in all studied area were very low.

Keywords : Evaluation; Prospecting; Gold; Silver; Gossan; Cuba.

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