Filling is required after each layer is taken, otherwise the height of the empty area after the completion is increased, which is inconvenient for mining operations and unsafe.

2) Filling process——After the mining situation, after completing a preparatory work (such as pouring partition wall, heightening the mine and smoothing the patio, etc.), then filling the filling from the filling well to the mine, the filling volume is designed. Stop at the required height, flatten the surface, and then lay a layer of concrete floor. At this point, the filling work is over and the next new cycle can begin.

3) Materials used for dry filling - use waste rock, that is, waste rock excavated underground, or open a special quarry to dig waste rock

For the filling block requirement: the block size should not be too large, generally not more than 300-350mm, and the difficulty in transportation.

It is required that the sulfur content in the filling material should not be too high, and the amount of yellow sand contained should be small, and other substances containing cohesiveness should be less.

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