Resumo

DIAZ-CARMONA, Abdiel  e  CUADOR-GIL, José Quintín. Complexities in the resources estimation of Besshi type minerals deposits on the north-west of Pinar del Río, Cuba, using non Linear Geostatistics. Bol. cienc. tierra [online]. 2019, n.45, pp.26-33. ISSN 0120-3630.  https://doi.org/10.15446/rbct.n45.73383.

Resources estimation of the copper grade values (Cu) using geostatistical methods was carried out in the “Hierro Mantua” (Cobre Mantua) mineral deposit, which is located at the north-west of Pinar del Río province, Cuba. The geologic complexities in the region of the deposit indicate the non-existence of homogeneity in the Cu values. The structural analysis showed a high asymmetric distribution in the variable studied. The non-existence of normality was verified by different mean and median values, a coefficient of variability greater than one, and the moving windows statistics of the mean was different. Under the previous conditions the data were log-transformed to assure the necessary stationarity in them and consequently to achieve an adequate accuracy in the resources estimation, using a rational Selecting Mining Unit (SMU). The log-transformed data revealed a homogeneous behavior in Cu grade values, demonstrated by better results in basic and moving windows statistics. Semivariograms showed defined structures with anisotropy in the 0° and 90° directions (considering 0 to the north). To apply the Lognormal Kriging estimation is the main objective of this work, because of the complexities of the geology in the studied area.

Palavras-chave : lognormal distribution; lognormal kriging; selecting mining unit Besshi.

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