(1) Without dividing the mine and the pillar, single-step recovery;

(2) The ore is mined from top to bottom in one stage. In the stage, it is not divided into several segments and taken back and forth. (This is the meaning of the subdivision method)

(3) Mining under the cover rock layer.

(4) For the purpose of ore mining, ore depositing, mining, transportation and secondary crushing. A bottom structure is dug in each section. The ore in the bottom column remains mined in the next or next stage.

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