Outdoor underground three-period mining method of inclined, thick and large mineral deposit

Abstract

The invention discloses an outdoor underground three-period mining method of an inclined, thick and large mineral deposit. The outdoor underground three-period mining method comprises the steps of dividing a life cycle of the mining the mineral deposit into an outdoor mining period, an mining transition period shifting from outdoor mining to underground and an underground mining period by the following two steps: creating an outdoor underground mining boundary division formula, according to a relationship between a limit stripping ratio function and an economic stripping ratio function, determining an outdoor underground mining boundary, and distinguishing the dividing of the life cycle of the mine; and on the basis of outdoor underground mining boundary division, determining a mining opportunity in each of three mining periods. According to the outdoor underground three-period mining method, three mining periods are subjected to unified comprehensive planning and designing, so that when the outdoor mining period is designed, a development system is considered to be utilized in the subsequent underground mining period, and when the mining operation transitions from outdoor mining period to the underground mining period, favorable factors such as related engineering and facilities and the like in the outdoor mining period are utilized as far as possible in the underground mining period at the same time. Therefore, repeated investment of the mine development system in construction can be effectively reduced. The outdoor underground three-period mining method can be widely applied to the mining of medium and thick or thick and large inclined or steep mineral deposits in the industries of black metal, nonferrous metal, coal, chemical and the like.

Description

technical field [0001] The invention belongs to the technical field of open-pit-to-underground mining, and is particularly suitable for the mining of medium-thick or thick inclined or steeply inclined deposits, and can be widely used in similar mining in black, non-ferrous, coal, chemical and other industries. Background technique [0002] my country is a country with serious shortage of mineral resources, especially the contradiction between supply and demand of strategic metal mineral resources is prominent. Taking iron ore resources as an example, my country's dependence on foreign iron ore resources is as high as 71%, which seriously threatens the economic security of my country's iron and steel industry. At present, the large-scale open-pit iron mines that account for more than 60% of my country's iron ore output have entered the middle and late stages of mining, and their production capacity has rapidly declined, and some have stopped production and closed pits, which ...

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Problems solved by technology

[0006] The purpose of the present invention is to solve problems such as the lack of overall planning of ore deposits in the mining design of open-pit to underground mines in my country, resulting in repeated investment in mines, low utilization rate of ore deposit development, difficulty in smooth transition from open-pit mines to underground mining, and reduced mining efficiency. The proposed method takes the life cycle of large-scale mining as the overall planning and design, and provides a three-stage open-pit and underground mining method for inclined and thick large ore deposits. With the goal of maximizing benefits, deposit mining is divided into open-pit mining stage, open-pit to underground transition stage and underground mining stage

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