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

Table 3

Rotation component matrix.

Original index variable	Principal factors
	1	2	3
Dominant slope of the surface after excavation or the deposition of debris (°), X1	−0.235	0.886	−0.040
Depth of the excavation (m) or the flatness of the deposited debris (m^3/m^2), X2	−0.076	0.794	−0.140
Yield reduction caused by the damaged land (%), X3	−0.340	0.802	0.145
Clay content in soil (%), X4	0.965	−0.050	0.015
Organic matter content in soil (%), X5	0.943	0.054	−0.096
Soil thickness before land damage (cm), X6	0.867	−0.353	0.068
Soil conservation rate available for reclamation (%), X7	0.744	−0.497	0.142
Vegetation coverage rate of land reclamation units before mining (%), X8	0.937	−0.134	0.202
Surface river runoff available for irrigation in land reclamation units (m^3/s), X9	0.310	−0.127	0.931