RE: Geo mapping31 May 2020 22:42
I can't pretend to understand how Russian mineral reserves are calculated but does this bit suggest a C2 classification could be expected to be about 40% accurate? You can guess what I'm thinking, but don't flame me!!
http://www.crirsco.com/conversion_guidelines_2010_9.pdf
In the Russian classification system, alongside the categorisation of resources, and as an additional measure of their degree of exploration, a quantitative and probabilistic estimation of accuracy and precision of definition of the main estimation parameters must be carried out. The Russian system defines this in terms of deviations of estimated explored resources from the 'true' values in a sample estimation block, in which the tonnage of mineral is commensurate with annual production capacity of the mining operation. The required precision is set at levels of <15%, <35%, <40%, and <60% respectively for categories A, B, C1, and C2 “guaranteeing” the accuracy of the overall estimation of resources for a notional 15-years mine life, in a fully explored deposit at a level of <15%.