It is a kind of bottom column caving method and has the common feature of the bottom column caving method. The stage caving method is to recover at the full height of the stage. It no longer divides the segments, but uses all stages as a nugget to mine. It uses a deep-hole blasting method to break the ore at all stages. It is a single-step continuous recovery, and a sufficient volume of compensation space must be drilled before the collapse. 40W electirc citrus juicer, 40W orange citrus juicer, 40W squeeze citrus juicer, 40W stainless steel citrus juicer NINGBO CHENGTUO ELECTRIC APPLIANCE CO.,LTD , https://www.ctblenders.com