Research Article

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

Table 1

Evaluation indexes and grading of land reclamation for Xinjiang mines.

Limiting factors and analysis indexesGrading of land reclaimed as farmlandGrading of land reclaimed as forest landGrading of land reclaimed as grassland

Topological slope<3111
4∼7211
8∼15311
16∼2542 or 12
26∼35423
>3543 or 24 or 3

Soil parent materialsLoam1Little influenceLittle influence
Clay and sandy loam2Little influenceLittle influence
Sandy soil3Little influenceLittle influence
Sandy-gravel soil44 or 3Little influence

Thickness of cover soils (mm)≥10011Little influence
99∼5021Little influence
49∼3032 or 3Little influence
29∼1042 or 4Little influence
<10443or 4

Irrigation and drainage conditionUnsubmerged or occasionally submerged, with favorable irrigation and drainage111
Seasonally submerged for a short time, with moderate irrigation and drainage222
Seasonally submerged for a long time, with poor irrigation and drainage333 or 4
Submerged for a long time, with almost no irrigation and drainage444

Nonuniform settlementNo settlement111
Mild settlement2 or 312
Moderate settlement42 or 33
Severe settlement433

Degree of pollutionNo pollution111
Mild pollution2 or 312
Moderate pollution422
Severe pollution433

Organic matter content in soil (%)>10111
10–62 or 311
<63 or 42 or 33 or 4

This table is derived from actual land reclamation carried out for mines in Xinjiang and the relevant national standards (completion standards on land reclamation quality). 1 denotes very suitable for land reclamation; 2 denotes somewhat suitable for land reclamation; 3 denotes not very suitable for land reclamation; and 4 denotes unsuitable for land reclamation.