Известия Томского политехнического университета: Инжиниринг георесурсов (Sep 2022)

METHODOLOGICAL ASPECTS OF CALCULATING THE RELIABLE VOLUME OF A SLUDGE SAMPLE ON THE EXAMPLE OF A PLACER GOLD DEPOSIT IN THE BALAGANNAKH STREAM (REPUBLIC OF SAKHA (YAKUTIA))

  • Ivan Yu. Sobyanin,
  • Roman Yu. Gavrilov,
  • Yuri P. Sobyanin

DOI
https://doi.org/10.18799/24131830/2022/9/3729
Journal volume & issue
Vol. 333, no. 9
pp. 37 – 45

Abstract

Read online

The relevance study lies in the need for reliable calculation of the reserves of placer gold deposits using the entirety of geological, mineralogical and statistical information, which in the future will allow using this calculation as a basis for designing exploration work on placer deposits in this area. The purpose: calculation of the required volume of a sludge sample to achieve sufficient reliability of the sampling results for a correct calculation of reserves. To achieve this goal, the following tasks were solved: the calculation formula for the volume of the sludge sample was selected and justified; the nature of gold distribution in the placer, which affects the volume of sampling, was taken into account; the required volume of a sludge sample was calculated using the example of a placer gold deposit. Methods: mineralogical studies, statistical data processing. Object: the results of testing exploration wells and data obtained during the operation of the field. Results. It was established that for the Balagannakh placer gold deposit, the sample volume in one section, which is necessary for the correct calculation of reserves, is 157 liters. When exploring narrow contours, it is necessary to use cluster drilling with wells with a bit diameter of at least 191 mm or drilling with a large diameter up to 400 mm. Also, to obtain reliable data, it is possible to use the method of rock erosion in the productive interval. To increase the reliability of the calculation of reserves, it is possible to use correction factors. The use of specialized programs for calculating reserves using the methods of mathematical statistics will make it possible to calculate reserves that are close to actual values. Where the thickness of loose sediments allows, it is recommended to use ditching, which will significantly improve the quality of sampling and obtain reliable results.

Keywords