The three main roads of Duan’s mine track, belt and return air were developed along the coal seam floor, and the concentrated return airway was tunneled along the coal roof. This resulted in a large height difference, a large slope, and difficulty in transporting coal at the working faces of the south and north wings and the centralized return airway. It is necessary to dig two rock slope roads about 50 meters long, and also need to install two belts and two coal slips. The amount of labor and capital invested is large, and the rock slope roadway excavation is time-consuming and laborious, and there is a large safety hazard, which seriously restricts the mine. Excavation succeeds.

　　In order to completely solve this problem, the leaders of Duanshi Mine held several special meetings based on the actual situation, and discussed repeatedly with relevant technical personnel, and decided to use raise drilling rigs in the drilling site at 62m east of the centralized return airway from the 3203 belt ( At the top of the belt roadway), 4 coal pass holes were constructed to transport coal during the 3203 and 3204 belt tunneling periods and the 3203 fully mechanized mining face.

　　It is understood that the construction of this project started on July 9 and is expected to be completed by the end of the month. The successful implementation of the project can reduce the advancement footage of the rock roadway by 100 meters. The investment per meter of footage is calculated at 28,000 yuan, and the construction cost of the coal pass is about 530,000 yuan, which can save 2.27 million yuan in cost. At the same time, it can increase the 100-meter coal road excavation and produce about 2,000 tons of raw coal. The profit per ton of coal is calculated at 300 yuan, and the economic benefit generated is about 600,000 yuan, which can directly create economic benefits of 2.87 million yuan. It also effectively reduces the amount of excavation and The construction is difficult, the transportation system is optimized, and a solid foundation is laid for the replacement of the Duanshi Mine.