3 results about "Stripping ratio" patented technology

This invention discloses a mining method for achieving a balanced stripping ratio, comprising the following steps: S1, determining the bench height: Based on rock properties, structure, drilling, and blasting methods, the final slope angle of the bench is determined. Further, based on the final slope angle, the width of the safety platform and the bench height are designed, resulting in the combined bench height H; S2, determining the bench height L based on the specifications of the stripping equipment, production safety requirements, and mining technology. Generally, the final slope can be divided into sections with 2-3 bench heights; S3, adjusting the combined bench H to be formed by combining two benches h1, thereby increasing the bench height. This invention effectively controls the amount of stripping in spatial location, enabling the mine to operate with a relatively stable stripping ratio over a longer period, ensuring sufficient secondary ore reserves, improving the efficiency of the mining machinery, reducing the number of benches from three to two, decreasing the frequency of frequent equipment adjustments, and increasing effective operating time.

This invention discloses an invasive mining method for deep-pit open-pit mines, comprising three main steps: over-stripping and over-drainage, horizontal pushing and internal drainage, and top-mining reverse drainage. In the over-stripping process, the originally inclined goaf floor is transformed into a horizontal one, creating internal drainage conditions for mining the entire depressed area and reducing external drainage volume and costs. In the over-drainage process, excess stripped material is temporarily stored within the mining area, and subsequent internal drainage can be achieved through reverse drainage, avoiding land resource occupation caused by external drainage. Horizontal pushing and internal drainage achieves horizontal advancement of the depressed area, restoring the management mode to its pre-depression state, reducing management difficulty, avoiding overhead or downward mining, and improving equipment utilization efficiency. In the top-mining reverse drainage process, the secondary stripping and over-drainage waste dump is backfilled into the depressed area, balancing the stripping ratio and drainage space, fully utilizing mine equipment capacity, and avoiding safety issues caused by idle goaf areas. By adjusting the temporal and spatial correlation between mining, stripping, and drainage, various problems currently faced when mining through depressed areas are avoided.

The application discloses a method for zoned mining of a super-thick inclined coal seam, which comprises the steps of zoned construction, "eight"-shaped internal dumping, external dumping backfilling and longitudinal mining to transverse mining, etc.; the whole open-pit mine realizes longitudinal mining to transverse mining, only the coal seam in the shallow area is mined in the initial construction stage, the stripping ratio is small, the investment can be recovered as soon as possible, the mining of the deep area and the shallow area is combined, and the stripping ratio is balanced; the internal dumping after the mining of the coal seam with a large inclination angle is realized, the external dumping land occupation is greatly reduced, the external dumping land is firstly established and then backfilled, the open-pit mining is completed without the external dumping land, the internal dumping material is not removed twice in the mining process, and the stripping cost is small; the internal dumping land is constructed in a pseudo-inclined mode, safety is ensured, the working lines are arranged staggeredly, the nearest transportation distance from the internal dumping land is kept, and the internal dumping cost is low.