Field parametric geostatistics - An alternative to tackle gold grade estimations

AUTOR(ES)

Machado, Rochana da Silva

FONTE

REM, Int. Eng. J.

DATA DE PUBLICAÇÃO

2019-03

RESUMO

Abstract High anomalous grades are very common in gold deposits, whose presence requires careful treatment to prevent overestimation of metal content. Mineral resource analysts have worked on the estimation of several gold deposits, and none of the classical methods were able to avoid manual interventions, such as cutting high grades for local estimation or using more information beyond the data for the variogram inference. The Field Parametric Geostatistics (FPG) is presented as an alternative for the application of linear kriging methods to estimate highly skewed distributions, proposing a mathematical model which incorporates the grades and its representativeness into a new variable, reducing the influence of high grades without empirical manual interventions. In this article, the mathematical formulation of the FPG theory is presented, as well as its application in datasets with outliers and high skewed distributions: the Walker Lake dataset and the Amapari gold deposit. The results are compared to results obtained by the application of standard techniques, demonstrating that FPG is a feasible alternative to estimate local grades and local reserves for highly skewed variables.

Documentos Relacionados

• Failure of oral thiomalate to act as an alternative to intramuscular gold in rheumatoid arthritis.
• Parametric resonance in dissipative field dynamics
• Trachoma--new opportunities to tackle an old problem.
• Atomic Absorption Spectrometry as an Alternative to Determine the Presence of Gold Nanoparticles on or in Silica Matrix
• Dynamic anisotropy and non-linear geostatistics supporting short term modelling of structurally complex gold mineralization