Abstract:
Based on collecting and arranging the previous monitoring data and dynamic monitoring research in a high latitude alpine copper mining area, the spatiotemporal variation trends of heavy metals of As, Cd, Cr, Cu, Hg, Mo, Ni, Pb and Zn in the surface soil of the study area in the past 12 year were compared and analyzed, and the accumulation rate of heavy metals in soil was quantitatively calculated. The analytical data showed that severe attention should be paid to the large possibility of soil deterioration due to the Cd and Cu contents of the heap leaching field had exceeded the national soil level II standard limit when the heap leaching had not yet started, and the annual average growth rate was faster. Comparatively, there was large soil environmental capacity for heavy metals except Ni at tailing reservoir and dump site. The transversal migration distance of Cr, Zn, Ni, Pb, Cr
6+, Cd and Cu was shorter than As, Hg and Mo at downstream of heap leaching field. Elements with longer moving distances were more likely to migrate downstream with heap leaching. The profile soil sample content of Cu, Zn, Cr and Cd decreased with the increasing of depth, and the heavy metal content in the topsoil was higher than that in the deep soil samples which shown the law of enrichment on the frozen front of permafrost.