General requirements for industrial indicators of table silver deposits project index Boundary grade (ωB)% 40~50 Minimum industrial grade (ωB)% 80~150 Average grade of the deposit (ωB)% >150 Minimum recoverable thickness m 0.8 to 1 Stone removal thickness m 2 to 4 Rain Cap,Stove Accessories Rain Cap,Solo Stove Accessories,Camp Chef Stove Accessories Jinan Huancheng Heating Equipment Manufacturing Co., Ltd. , https://www.globalstove.com