Suitability Evaluation for Land Reclamation of Nonmetallic Mines in Xinjiang, China

Guobin Tang,Kaikai Wang,Ruihua Hao,Zizhao Zhang,Qianli Lv

doi:10.1155/2020/4250814

Abstract

The ecological environment is fragile in Xinjiang, so it is necessary to carry out land reclamation for mines to restore its ecology. The premise of mines land reclamation is to determine the direction of land reclamation, which requires the suitability evaluation for land reclamation. In this paper, the evaluation index system and suitability evaluation model for land reclamation of nonmetallic mines in Xinjiang Uygur Autonomous Region were established. This model was established by using factor analysis, cluster analysis, and discriminant analysis and tested by back-substitution. First, using 149 units of 21 nonmetallic mines as research samples, the samples were divided into 4 categories by a combination of factor and cluster analysis. Then, the samples were trained using a discriminant analysis method to establish the corresponding land reclamation suitability evaluation model. This model was verified by back-substitution with an accuracy of 98.7%, and only 2 of 149 samples were misclassified. Finally, the evaluation model was applied to the Dabancheng Toga Solo limestone mine in Urumqi. Evaluation analysis of 15 land reclamation units of this mine showed satisfactory results. The evaluation model developed here could serve as a powerful complement to the evaluation of land reclamation suitability in Xinjiang.

Highlights

Exploitation of mineral resources has always been the pillar industry of Xinjiang’s economic development
If the mining method is a combination of side-hill cut mining and deep-concaved open-pit mining, the open pit is divided into two land reclamation units: the open-pit slope area and the bottom pit mining area. e research conducted here is a study on 21 nonmetallic mines in Xinjiang, and the 21 mines are divided into 149 land reclamation units, as shown in Supplementary Table 1
Results of Factor Analysis. e factor analysis data are listed in Supplementary Table 1. e factor analysis extracted the factor by the principal factor standard, and the criterion was that the first k principal factors were extracted when the cumulative contribution rate reached 85%. e load matrix of the factor was rotated according to the Kaiser-standardized orthogonal rotation method

Summary

Introduction

Exploitation of mineral resources has always been the pillar industry of Xinjiang’s economic development. In view of the above-mentioned research status and shortcomings of land reclamation suitability evaluation, we made a comprehensive study of the characteristics of damaged land and the ecological environmental conditions of nonmetallic mines in Xinjiang and determined the corresponding land reclamation suitability evaluation indexes system which is different from the previous research results according to relevant regulations and standards. 2. Suitability Evaluation Indexes System of Mines Land Reclamation e types of land damaged by nonmetallic mines in Xinjiang are mainly grassland and bare land. Combined with relevant standards and characteristics of nonmetallic mines in Xinjiang, the selection of evaluation indexes was focused mainly on four major aspects: the severity of land damage, the soil conditions, the original vegetation conditions of the land reclamation units, and the irrigation and drainage conditions. If the mining method is a combination of side-hill cut mining and deep-concaved open-pit mining, the open pit is divided into two land reclamation units: the open-pit slope area and the bottom pit mining area. e research conducted here is a study on 21 nonmetallic mines in Xinjiang, and the 21 mines are divided into 149 land reclamation units, as shown in Supplementary Table 1

Factor Analysis

Land Reclamation Suitability Evaluation Model

Evaluation results for reclamation units

Conclusions