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ArticleName Equipment and method for direct determination of uranium in Khiagda ore province in in-situ leaching
DOI 10.17580/gzh.2023.02.06
ArticleAuthor Gladyshev A. V.

VNIPIpromtekhnologii JSC, Moscow, Russia:

A. V. Gladyshev, CEO,


The age of uranium ore and the water exchange intensity in ore-bearing strata has a direct effect on radiology of hydrogenous uranium deposits suitable for the in-situ leaching, connected with radioactive balances in the U–Ra systems (830 thousand years) and Ra–Rn systems (23 days), used in traditional gamma logging in appraisal of uranium resources. However, this method is insufficiently reliable sometimes, for instance, in Khiagda ore province. Ore dating by different methods yields a time span of 12–1.5 million years. The traditional gamma logging approach to determining uranium content in Khiagda ore shows the upward flow of radon in the zones of highly jointed and discontinuous zones in granite basement. Ra–Rn equilibrium was unfound even on the 54th day of the gamma log surveys. The article describes the prompt fission neutron logging technique (PFNL). This method uses the property of isotope 235U to split intensively in the field of slow neutrons, with emission of fission neutrons. Currently, this method is the main technique of direct uranium detection in ore deposits during in-situ leaching. The physical processes of emitting of prompt neutrons by isotope Uranium-235 in radiation of an ore body by thermal neutrons from a borehole impulse neutron generator are described. The case-studies of finding reliable variables to estimate ore-bearing sites at Khiagda deposit.

keywords Logging, gamma logging, prompt neutrons, ore-bearing sites, in-situ leaching, impulse generator, decay of natural radionuclides

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