Open-cast side shrouded beneficial mineral open well combined mining method

Abstract

The present invention provides a combined exploitation method for a beneficial mineral open well is covered under a strip mine boundary slope. The problems to be solved by the combined exploitation method are as follows: firstly, a spiral drill is used for recovering, a stable is required to be reserved between two drills due to the restriction of the length of a drill rod, so the percentage extraction is very low; secondly, a slope mine is excavated from the proper position on the surface of ground, a roadway is extended to a ledge for arranging a mining area, and underground mining is realized. The slope mine construction and support project quantity is large, which is expense-wasting and time-consuming. In the key points of the combined exploitation method, the ledge section at the boundary slope of the goaf of the strip mine is used, a main adit and a secondary adit are excavated in the ledge directly and are extended into the boundary slope for arranging the mining area to realize the underground exploitation and recovery of the beneficial mineral in the strip mine boundary slope. Then the mineral is transported to the ground by a transportation channel or a haulage plant which is formed in a strip mine stope. The combined exploitation method has the advantages of saving a great deal of slope mine construction project quantity and support project quantity, avoiding the unsafe factor of the slope mine during the processes of construction and operation and improving the production system safety of the mine.

Description

technical field [0001] The invention relates to a method for covering beneficial minerals (metal, non-metal or coal, the same below) under the sides of an open-pit mine excavation field, utilizing the convenience of exposing the beneficial minerals on the sides of the open-pit mine, and adopting underground technology to recover the beneficial minerals . Background technique [0002] At present, there are several methods for recovering the beneficial minerals under the side of the open-pit mining site: (1) using an auger to recover, limited by the length of the drill pipe, and a stable ore pillar must be left between the two drills, so the recovery rate (2) In recent years, a kind of front-end machine similar to an underground coal cutter has appeared, which uses a multi-section box-shaped screw rod chute to return to the mine, which is slightly improved than the auger method. However, it also has the disadvantages of being limited by the mechanical length, requiring a larg...

AI Technical Summary

Problems solved by technology

The construction and support of inclined shafts is a large amount of work, which is costly and time-consuming