HAULAGE ANALYSIS IN THE AIM OF THE COMBINED SYSTEM APPLICATION ON THE LEAD AND ZINC MINE "SASE" SREBRENICA

One of the most important influencing factors on the economy of mines with surface and underground exploitation is the correct choice of haulage technology of ore and waste. The paper analyzes the haulage of ore and waste in the Lead and Zinc Mine "Sase" Srebrenica and determines the optimal haulage length on the four excavation blocks for the application of the new haulage system by using the mine trucks from the aspect of set criteria, increasing capacity and reducing haulage costs through the techno - economic analysis and optimization.The optimal haulage length is determined through the calculations of the loader capacity and the possible choice of the truck depending on the stated criteria.

Investigation of morphological and mineralogy characteristics of dust around the lead and zinc mine in Mehdiabad, Yazd, Iran, Using the SEM and XRD analyzes

Introduction: Dust created by mining activities is one of the most important concerns regarding human health and the environment protection. The aim of this study was to identify the mineralogical and morphological characteristics of dust particles found around the lead and zinc mine of Mehdiabad. Materials and methods: First of all, dust samples were collected around the mine by installing eight passive marble dust collectors using a combined systematic random method during February, March and April in 2020. Then, using two methods of X-ray diffraction (XRD) and scanning electron mi- croscopy (SEM) mineralogy, shape and distribution of the particles of dust samples were investigated. Results: The highest frequency of particles with sizes less than 10, 10-60, and 60-100 µm were determined and observed in S1 station in the northwest, and S5 and S2 stations in the southwest of the mine, respectively. The re- sults of SEM analysis revealed that the appearance of dust particles is mostly Spherical, Irregular, Elongated, Prismatic, and Rhombic. The results of XRD analysis showed that the minerals anorthite (Ca (Al2Si2O8)), dolomite (Ca Mg (CO3)2), albite (NaAlSi3O8), calcite (CaCO3), quartz (SiO2) and muscovite(KAl2 (Si3AlO10)) (OH2) have the highest frequency in dust samples. Conclusion: The findings show that the predominant mineralogical compo- sition of dust particles includes carbonates (dominant mineral: calcite) and silicates (dominant mineral: quartz) which are found in all stations. Thus, dust particles, with high frequency of quartz, have a high potential to result in respiratory diseases in the inhabitants living around the mine.

Risk Assessment at Workplace in Underground Lead and Zinc Mine with Application of Fuzzy Topsis Method

Underground mining is considered one of the most dangerous industries, because serious injuries or accidents often occur at the workplace. In recent years, fuzzy multiple criteria decision-making has found increasing application in job risk assessment, taking into account a number of influential parameters. This paper uses fuzzy TOPSIS method for workplace risk assessment in an underground lead and zinc mine, where the results are be compared with the number of injuries and accidents that have occurred in individual workplaces to assess its accuracy. Accurate workplace risk assessment in underground mines is very important so that appropriate safety measures can be taken in a timely manner to avoid injuries and deaths at work.

Phytoremediation Ability of the New Heavy Metal Accumulator Plants

Environmental pollution with heavy metals is a global disaster. This study investigated metal-accumulating ability of plants growing in a lead and zinc mine area located in Hamedan, Iran. Three dominant plants, including Conium maculatum, Stachys inflata, and Reseda lutea, were collected, and the concentrations of Cd, Cu, Pb, Ni, and Zn in the aerial parts of the plants and in the soils, collected from the mine area and out of the mine, were measured via atomic absorption spectrometry. The concentrations of all the metals in the soil of the mine were greater than the control area (1 km out of mine area); Pb, Zn, Cu, Ni, and Cd were 120, 17, 17, 2.6, and 40 times higher than in the control area, respectively. In the studied plants, Pb and Zn were the highest in C. maculatum (1,200 and 820 mg kg−1, respectively). The highest concentrations of Cu, Ni, and Cd were in S. inflata (140, 96, and 20 mg kg−1, respectively). Phytoremediation tests were done using experimental pots, and results indicate that the plant species are effective accumulator plants for the phytoremediation of heavy metal–polluted soils. Specifically, C. maculatum was effective in removing Pb and Zn, S. inflata was effective in reducing Ni, and R. lutea was effective in reducing Cu.