Discreteness and mosaic characteristics of mineralization and ore-free blocks of the Jeruy stockwork gold deposit

Discreteness and mosaic characteristics of the ore, discontinuous and substandard blocks of a stockwork-type mineralization are studied. In-mine exploration of the upper part of the North-West Stockwork was carried out by drilling exploration boreholes using a 20×20 m grid (10 profiles, 66 exploration boreholes) from the 3600-meter bench of the developed open pit to a depth of 60-120 m with core sampling per 1 linear meter and analytical work for gold, determination up to 0.05 g/t over 5200 samples). A wireframe model of the mineralization was created based on the following grading: <2.4 g/t; >2.4 g/t; >3 g/t; >5 g/t. In order to investigate the discrete, mosaic model of the mineralization characteristics, the presented data are segregated by cutoff grade up to 1.46 g/t (underground resources), and by grading: 1.46-2.99 g/t; 3.0-5.99 g/t; 6.0-11.9 g/t; 12.0-23.9 g/t; 24.0-48.0 g/t and >48.0 g/t. The intervals of the represented grade classes are identified with the inclusion of substandard intervals with the grades below 1.46 g/t up to 2-4 meters. The substandard intervals above 4 m are defined as the ore-free intervals. The volume of the listed morphological and concentration formations is 50.2%-22% and 27%, respectively. Assessment of gold concentrations in the selected morphological blocks allows to evaluate and justify geotechnical and geotechnological parameters of the underground mine of the frame type.