Physicochemical Properties Of Pit-water From Ishiagu Lead/ Zinc (Pb/Zn) Mine As An index For Alkaline Classification Of The Mine Drainage.|
Aroh, K.N.; Eze, C.L.; Abam, T.K.S.; Gobo, A.E. & Ubong, I.U.
The nature and chemical composition of mine pit-water was investigated in Ishiagu lead/zinc
(Pb/Zn) mine in southeastern, Nigeria. Laboratory determination of some physicochemical parameters namely,
temperature, total dissolved solids (TDS), conductivity , chloride, pH, alkalinity, hardness, sulphate and dissolved
metal constituents like calcium and magnesium were assessed in the three mine pits using standard methods. The
results showed that Ishiagu Pb/Zn mine is slightly acidic with moderate levels of dissolved metal constituents.
Seasonal variation observed in the parameters indicate higher levels for pH (6.7-8.1), alkalinity (36.4--115.3mg/l) and
sulphate (6.8-84.4) in the wet season when compared with corresponding values, pH (6.1-7.3), alkalinity (31.3-
98.4mg/l) and sulphate (6.1-78mg/l) in the dry season. The consistently the higher levels of pH, alkalinity, hardness,
calcium, magnesium, total dissolved solids (TDS) and conductivity in more than 66% of the mine pits (mine 1and
mine 3) investigated across the season is an indication of changing state of the mine pit-water to more alkaline mine
drainage. This phenomenon is attributable to preponderance and buffering effect of carbonate minerals in the area.