Table 1 rock gold mine industrial index reference project index Boundary grade (mass number of molecules) (1 × 10 - 6 ) ~ (2 × 10 - 6 ), heap leaching oxidized ore is (0.5 × 10 - 6 ) ~ (1 × 10 - 6 ) Minimum industrial grade (mass number of molecules) (2.5×10 - 6 )~(4.5×10 - 6 ) Average grade of mineral deposits (mass number of molecules) (4.5×10 - 6 )~(5.5×10 - 6 ) Minimum recoverable thickness 0.8~1.5m, the steep slope is the lower limit, and the gentle slope is the upper limit. Stone removal thickness 2 to 4 m, underground miners are the lower limit, open pit miners are the upper limit Non-mine segment rejection criteria The corresponding project is 10~15m Non-corresponding project is 20~30m Table 2 General requirements for industrial indicators of symbiotic ( copper , lead and zinc ) in rock and gold mines project Sulphide ore Oxidized ore Cu (copper) Pb (lead) Zn (zinc) Cu (copper) Pb (lead) Zn (zinc) Boundary grade (ωB)% 0.2 to 0.3 0.3 to 0.5 0.5 to 1 0.5 0.5 to 1 1.5~2 Minimum industrial grade (ωB)% 0.4 to 0.5 0.7 to 1 1 to 2 0.7 1.5~2 3 to 6 Average grade of the deposit (ωB)% 0.7 to 1 6 6 10~12 10~12 Minimum recoverable thickness m 1 to 2 1 to 2 1 to 2 1 1 to 2 1 to 2 Stone removal thickness m 2 to 4 2 to 4 2 to 4 2 2 to 4 2 to 4 Table 3 Evaluation of associated components of rock gold ore element copper lead Zinc Tungsten trioxide antimony molybdenum Cu Pb Zn WO 3 Sb Mo Quality score 0.1 0.2 0.4 0.5 0.4 0.01 element arsenic carbon sulfur cobalt silver As C S Co Ag Quality score 0.2 2 0.01 2(g/t) Utility Tyre,Right Atv Tires,22X11 10 Atv Tires,Custom Kenda Tyres Jiangyin Estone Trading Co.,Ltd. , https://www.estonerubber.com