| 1 | The filling process of waste was designed. | |
| 2 | The miners muck the waste rock every other day. | |
| 3 | Spray explosion of gangue hill is a common calamity in coal mine. | |
| 4 | In addition, the waste filling technique was designed successfully applied in Xingdong coal mine. | |
| 5 | The discharge system for the belt conveyance of the waste rock in the mine well solves these problems. |