Unusually high sample determination based on modal analysis
https://doi.org/10.21285/2686-9993-2025-48-1-112-121
EDN: RVPXPZ
Abstract
The analysis of unusually high samples requires special accuracy, since possible errors in calculating re serves can lead to unjustified underestimation or overestimation of reserves at the ore field site and significantly distort the true picture of the economic viability of the solid mineral deposit. The most commonly used methods for determining unusually high samples are based on statistical analysis, which makes it possible to justify mathematically the identifi cation of outstanding samples. Nevertheless, in some cases, modified histogram construction methods should be used for deposits of the third and fourth complexity groups to identify unusually high samples. The purpose of this study is to demonstrate the possibility of using modal analysis enabling identification of low-frequency values on a histogram. To make the calculation of the number of classes more convenient a formula and a graphical method for determining this value are proposed. In addition to the frequency analysis, the spatial component of the useful component distribution at the deposit is analyzed, as well as the location of unusually high samples on the plan or section. This method allows to determine the spatial clustering of samples and not to classify this case as unusually high samples. The article demon strates the testing of this method based on a placer gold deposit. The number of classes is calculated according to the proposed methodology, modal values are calculated, and a spatial analysis is carried out using the inverse distance weighted method.
About the Author
V. L. Ruposov
Irkutsk National Research Technical University
Russian Federation
Competing Interests:
Russian Federation
Vitaliy L. Ruposov, Cand. Sci. (Geol. & Mineral.), Associate Professor, Associate Professor of the Department of Surveying and Geodesy, Institute of Subsoil Use
Irkutsk
Competing Interests:
The author declares no conflict of interests.
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Review
For citations:
Ruposov V.L. Unusually high sample determination based on modal analysis. Earth sciences and subsoil use. 2025;48(1):112-121. (In Russ.) https://doi.org/10.21285/2686-9993-2025-48-1-112-121. EDN: RVPXPZ
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