Item	Unit	Limit (mg/L)	Langwoqu Mine		Majiagaigou Mine
Item	Unit	Limit (mg/L)	Test value (mg/L)	Result	Test value(mg/L)	Result
pH		6.5 - 8.5	8.1	Normal	7.7	Normal
Fe	mg/L	0.3	0.02	Normal	0.04	Normal
Cl	mg/L	250	28.36	Normal	95.72	Normal
Sulphate	mg/L	250	32.08	Normal	260.51	Normal
Total dissolved solids	mg/L	1000	315.96	Normal	683.68	Normal
Total hardness	mg/L	450	182.32	Normal	339.32	Normal
Chemical oxygen demand	mg/L	3	10.99	Above standard	3.30	Above standard
F^-	mg/L	1.0	0.97	Normal	1.10	Above standard