Bottomless sublevel caving method and pillar size

1) Crossing gap and division of ore blocks For the pillarless sublevel caving method, there is no obvious sign of dividing the nugget. For the convenience of production management, it is generally divided into a nugget by the scope of a chute service. The size of the gap between the wells, the ave

·Huaqin Group has huge potential for tire export

On June 19, Huaqin Rubber Industry Group held a comprehensive tire export certification training. It is understood that the training includes the introduction of tire certification regulations, application procedures, precautions, and related technical parameters. The tire export certification tr