A probabilistic approach to the dynamic cut-off grade assessment

Cut-off grade is an important conditioning parameter that determines the quantity and quality of recoverable reserves development efficiency. Today, Russian mining companies operate with certified requirements. By setting permanent requirements, government seeks to prevent depletion reserves, reduced production during periods falling prices, decreased budget revenues, expressing interests all members society. But what extent do requirements protect state? The answer this question ambiguous does not lie on surface. State Commission for Reserves domestic researchers are working find a rational solution problem One dynamic effectiveness their application has been proven individual companies, but it incorrect transfer these conclusions entire mineral resource base country.
 This article presents new approach determining cut-off grade, which varies depending price minerals. proposed be determined based indicators constant exploration work, using maximum allowable costs in region. allows calculate effect introduction practice subsurface use state (in form amount taxes received) subsoil users income). For group gold-bearing deposits open-pit method, was established values changes ensures compliance users.