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A method for determining the reasonable boundary of open-pit to underground mining in mines

A technology that converts from open-pit to underground and open-pit mining. It is applied in underground mining, surface mining, earth drilling and mining, etc. It can solve problems such as changes in mining depth without considering infrastructure investment, time value of funds, and open-pit mining costs. Achieve strong screening function and reduce market risk

Inactive Publication Date: 2011-12-21
SINOSTEEL MAANSHAN INST OF MINING RES
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  • Abstract
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Problems solved by technology

This method is only compared from the cost calculation, and the mining cost is the average value, without considering the change of the cost of open-pit mining with the mining depth, and at the same time, factors such as infrastructure investment and time value of funds are not considered

Method used

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  • A method for determining the reasonable boundary of open-pit to underground mining in mines
  • A method for determining the reasonable boundary of open-pit to underground mining in mines
  • A method for determining the reasonable boundary of open-pit to underground mining in mines

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Embodiment approach

[0035] figure 2 It is a method to determine the reasonable boundary line from open-pit to underground mining in a mine successfully determined. +70m is the boundary line that the first step of the inventive method determines, and -62m is that the mine enterprise independently selects the boundary line according to the actual situation, and establishes the dynamic economic analysis model of two boundaries by the second step of the present invention to calculate the total net present value of ore deposits. Depend on figure 2 The comparison of the total net present value shown shows that +70m is the best reasonable limit for the mine's open-pit to underground economy. Concrete implementation scheme is as follows:

[0036] first step:

[0037] Construct the digital model of the ore deposit, establish the shape and grade function of the ore deposit, and calculate the grade of each layer of the ore body. The ore grade, stripping length, ore body thickness, and open-pit mining c...

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Abstract

The invention discloses a method for determining a reasonable boundary for converting strip mining into underground mining for a mine, which is determined by calculation in the following two steps: 1, constructing the economic and reasonable stripping ratio and the state stripping ratio function of a grade variable and a cost variable, and carrying out static computational analysis; 2, carrying out dynamic economic comparison for a possibly suggested boundary scheme by combining with the practical situation of the mine on the basis of the first step; building a dynamic economic model with themining depth; comprehensively considering the investment, the profit and the fund time value of the whole mine life cycle to carry out optimized comparison; and obtaining the reasonable boundary for converting strip mining into underground mining for the mine by the principle that the total net present value of the mine is maximum. The method has strong function for screening the deep scheme for converting strip mining into underground mining for the mine. According to the practical situation, a mine enterprise can automatically select a plurality of deep schemes to make a comparsion, and market risks brought by scheme selection can be effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of open-pit-to-underground mining, in particular to a method for determining a reasonable boundary line for changing mine from open-pit to underground mining. Background technique [0002] There are 16 open-pit iron mines with an annual production capacity of more than 3 million tons in my country, and 10 of them have a design depth of more than 200m (below the closed circle). The mining of a considerable number of mines has entered the middle and late stages, and the production capacity of domestic mines that are about to switch from open-pit to underground mining is nearly 20 million tons. Since most of the large-scale open-pit iron mines in my country are inclined and steeply inclined deposits, the depth of ore body burial is generally large, and they are short and deep deposits. There are a large number of mineral resources in the deep part below the open-pit boundary. According to incomplete statistics...

Claims

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Application Information

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IPC IPC(8): E21C41/16
Inventor 王运敏代碧波章林汪为平李家泉
Owner SINOSTEEL MAANSHAN INST OF MINING RES
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