Table 4. The averages of heavy metal pollution rates in the non-ferrous mining and smelting areas (%).

Non-ferrous mining and smelting activities	Cu	Pb	Zn	Cd	As	Ni	Cr	Hg
Cu	63.64	0.00	12.12	83.67	0.00	0.00	0.00	45.74
Au	9.06	12.47	3.33	2.25	0.75	—	0.00	45.07
Hg	100.00	25.00	—	33.33	—	—	—	73.58
Mn	70.00	70.00	17.36	95.00	—	—	15.00	—
Mo	11.67	3.33	16.67	100.00	8.33	13.33	10.00	95.00
Pb/zn	57.61	49.64	72.23	74.43	29.42	44.60	9.28	68.51
Sb	82.35	100.00	88.24	100.00	94.12	100.00	100.00	100.00
Sn	100.00	14.04	75.00	21.05	2.22	50.00	—	—
W	95.00	20.00	30.00	100.00	100.00	—	—	—
Fe	3.40	0		0	0.85		0	0
Total	41.42	31.01	49.04	63.20	18.38	35.39	5.22	55.05