عنوان مقاله [English]
Angouran Lead and Zinc Mining deposit is one of the biggest Lead and Zinc deposits of Middle East and one of five great mines of Iran according to the article of categorization of the mines of Iran. In addition to the diverse metal and non-metal mines, there are many industries and factories in this region which most of them were active and are as conversion industries of Zinc soil into the Concentrate or as factoring of Lead and Zinc Bar. The realized studies demonstrate that due to activation of existent industries in that region, the rate of some elements are in unusual level and show some fundamental environmental abnormalities. The environment of the region is mostly influenced by the accumulation of wastes and residues dispossessed as cake in the borders of the rivers and canals and open lands. These Cakes which as a matter of fact are the residues of proceeding of the flotation and melting the Lead and Zinc and the process of Concentrate factoring, may have lost the great amount of their Lead and Zinc in the industrial point of view, but as an environment view, those have a lot of Lead and Zinc many times more than allowed limits which are potentially toxic. At the other hand, by reduction of these elements, the densities of other elements are increasing. This means intensive effects which in this paper are going to be surveyed. The rates of these elements in some samples are reported exceeding to 10,000 ppm Lead and Zinc and Nickel and also 8,000 ppm Arsenic and 4,000 Cadmium. The studies also demonstrate that waste pool or the pools of residues are one of the most fundamental causes of dangers for the environment of the region. The rate of 200,000 ppm of Zinc and sometimes 2000 ppm of Lead and 20,000 ppm Nickel, also tha rate of some hundreds ppm of arsenic and even 200,000 ppm of Cadmium in the water and water deposits of the region are some of those dangers. The most of these abnormalities are seen in the sediments and water of the region, however the agricultural grounds are also influenced by these pollutions and are included some major abnormalities in term of the environment. This paper will exclusively review the allowed rate of the elements of Lead, Zinc, Cadmium, and Arsenic and survey the principal manners of access of these elements to the environment of region and also try to present some solution for the control and reduction of these rates.