Environmental impacts of mining of Ni-Mo black shale-hosted deposits in the Zunyi region, southern China: Preliminary results of the study of toxic metals in the system rock-soil-plant
Bulletin of Geosciences, volume 78, issue 3;
pages: 251 - 260;
Received 4 June 2002;
Accepted in revised form 21 March 2003;
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The Zunyi region in Guizhou province (southern China) is well known by the occurrences of Mo-Ni-polyelement black shales that are locally mined and processed for Mo. The preliminary results of our environmentally oriented study covering the vicinity of the Xiao-Zhu mine, Jiepo-Ling and Tuan Shan Bao Mo-Ni prospects can be summarized as follows:  The studied surface soil samples from all three Ni-Mo prospects are characterized by increased Mo, Ni, As, Cd, Zn and Cu concentrations and lower Pb values when compared to the worldwide averages for normal soil (Bowen 1979).  Maximum Mo concentration was found in rice stalk and maximum As and V concentrations in the bulb of turnip close to the Xiao-Zhu Mo-Ni mine. Peak Ni, Zn and Hg concentrations were detected in corn grain of the Jiepo-Ling area. Cd accumulates preferentially in tobacco leaves where it reaches maximum values.  Rice grains from the Xiao-Zhu area contain anomalous concentrations of Cd and rice grains from the Tuan Shan Bao area contain anomalous concentrations of Cd, Cu and Zn.  Corn grains from the Jiepo-Ling area bear anomalous concentrations of Zn, Cd, Cu, Mo and Ni.