The Cause of Drop of the Water Level of Underground Quaternary Aquifer of a Mine under Mining Influence

Table 3

Statistical characteristics of loose aquifer content in experimental coal mine.

Component	Na^++K^+	Ca^2+	Mg^2+	Cl^-	SO4^2-	HCO3^-	CO3^2-	TDS	pH
Number of samples	11	11	11	11	11	11	11	11	11
Minimum value	96.99	57.11	17.59	85.47	97.55	86.55	0	540.115	7.76
Maximum value	1,842.80	334.33	190.52	335.78	4,160.04	422.12	89.86	6,818.89	9.68
Average value	952.71	148.934	87.194	223.152	2,183.99	217.075	20.412	3,724.93	8.485
Standard deviation	502.249	91.592	49.055	93.869	1,187.86	118.257	24.644	1,707.51	0.481
Coefficient of variation	0.527	0.615	0.563	0.421	0.544	0.545	1.207	0.458	0.057
value	0.051	0.058	>0.15	0.058	>0.15	>0.15	<0.01	>0.15	0.052