It belongs to the dry filling method and has the same general characteristics as the dry filling method. It is also a two-step recovery, down to the top layer. As the working face advances upwards, the goaf is filled layer by layer to support the surrounding rock of the upper and lower plates and cause continuous working conditions.
When the mine is in the final stratification, it is topped for filling. After the mining house is finished, it will be returned to the mining column in a planned manner.
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