Optimization of Stope Structure Parameters Based on the Mined Orebody at the Meishan Iron Mine

Mingzhi Sun,Fengyu Ren,Hangxing Ding,Gan Feng

doi:10.1155/2021/8052827

Abstract

Based on the engineering background of the Meishan iron mine with sublevel caving (SLC) method, in this work, we adopted the method for identifying the shape of mined orebody (the original location in blasted slice), which analyzed and determined reasonable stope structure parameters. In the field test, the markers were arranged in the blasted slice, the mined orebody was measured by in situ tests, and reliable data were achieved. The shape of the mined orebody was obtained through this test when the width of drift was 6 m. The mined orebody’s shape was compared with the shape of the isolated extraction zone (IEZ), and the difference increased with increasing height. When the stope structural parameters were determined by the mined orebody, the larger the sublevel height was, the smaller the error was, which was compared with the method using ellipsoid arrangement theory to determine the stope structural parameters. Finally, the reasonable stope structure parameters were optimized. The sublevel height was 22 m, and the drift spacing was 20 m.

Highlights

Introduction e characteristic of thesublevel caving (SLC) method is the large contact area between blasted ores and the caved waste from the overlying rock mass. e overall shape of the blasted ores and the residual ores is less consistent with the isolated extraction zone (IEZ)’s shape if the stope structure parameters mismatch the flow behavior of blasted ores [1,2,3,4,5,6]
The markers were arranged in the blasted slice, the mined orebody was measured by in situ tests, and reliable data were achieved. e shape of the mined orebody was obtained through this test when the width of drift was 6 m. e mined orebody’s shape was compared with the shape of the isolated extraction zone (IEZ), and the difference increased with increasing height
Kvapil et al [16] conducted many research works on the design and optimization of structural parameters in the SLC method. e result shown that the shape of blasted ores and IEZ followed the consistency principle, which based on the ellipsoid draw theory

Summary

In Situ Mined Orebody Measurement Test

E corresponding quality of drawn ores was measured when the blasted ores containing markers were drawn, and the mined orebody’s shape could be obtained. To determine the mined orebody’s shape, the operation is selected in row 10 of S1 drift at −306 m level in the Meishan iron mine. A sufficient number of markers were monitored, which provided abundant data for the determination of the mined orebody’s shape

Analysis of the Test Result

Optimization of Stope Structure Parameters

Findings

Conclusions