environmental effects of gol-e-gohar iron ore mine on groundwater of the area

thesis
abstract

gol-e-gohar iron ore mine of sirjan in southern part of iran is a large open pit that operates below the groundwater table and during mining operation, dewatering is required to prevent operation processes from flooding. current operation is going on by digging wells in or out of the pit and pumping to prevent flooding. as a result of the former dewatering operation a vast deep cone of depression has been formed and water from all around the area is flowing into the pit. salinity of discharged groundwater is very high and may affect on the ground water quality and environment. on other hand, until now, tailings of mine activities have been disposed of without proper environmental safeguards. to address this problem, a tailings dam is proposed to be constructed in accordance with environmental standards. study of hydrochemistry and chemical processes involved in conjunction with isotopes study are applied to investigate the dewatering effects on the groundwater quality and their origins. for this, ground water samples were collected for hydrochemistry, trace elements and isotopes 18o and 2h studies. based on the results of chemical analysis, water types were categorized into four groups (na-cl, ca-cl, na-so4 and na-hco3) and based on water types, various ion ratios and isotope studies, it is concluded that groundwater of the pit area is affected by deep saline groundwater which is related to the northern salt marsh through the saltwater intrusion happening. while, distant ground waters are related to meteoric water containing dissolved minerals in contact. based on trace elements studies, mean concentration of elements for all water samples in descending order are: sr > fe > b > mn > ba > al > zn > as > pb > cu > mo > ni > co > u. evaluation of the results is done by comparing “heavy metal pollution index” (hpi), “heavy metal evaluation index” (hei) and “degree of contamination” (cd). the indices show that most of the water samples are counted as low contaminated according to who standards of drinking water and contamination levels are not dangerous. low concentration of the heavy metals in the groundwater of the area is mainly due to geochemical conditions and hydrogeochemical properties of the soil and its minerals contents. presence of calcite (caco3) in the area neutralizes the acid generated from sulfide oxidation and reduces the metals availabilities. in addition, high adsorption potential of heavy metals by soil also helps this situation. furthermore, in order to assess the effect of tailings waste disposal behind the proposed tailings dam and predict the risk of metals contaminant release from the tailings into the environment, laboratory batch and sorption isotherm tests and a field experiment were conducted on the soil of the area. results of experiments showed that although the concentration of trace elements in the tailings waste is very high, their adsorption in the soil profile (below tailings dam site) is generally strong indicating that the soils in the study area can restrain some of the elements from entering the groundwater. however, even metals that adsorb well to the soil may eventually enter the groundwater after a long time. therefore, the use of a 2.0 mm thick high-density polyethylene geotextile layer covered with clay to protect the geomembrane is suggested in the tailings dam system design.

similar resources

Feasibility study of Gol-Gohar iron ore open cast mine operation of Iran

Feasibility study of the mining operation is one of the most important parts of the total mineral exploitation process. The economic importance of this, increases with the size of the mineral reserves. Gol-Gohar is one of the largest iron ore mines in Iran with an annual output of some 11 million tons. In this paper, the total costs associated with Gol-Gohar open cast mine have been calculated....

full text

The Effect of Binder Type on the Properties of Briquette and Pellet Produced from the Magnetite Concentrate of Gol-E-Gohar Iron-Ore

Binders are of prime importance in the agglomeration of iron ore concentrates. In this research, strength and density of briquette produced from the magnetite concentrate of Gol-E-Gohar were investigated using different binders at various applied pressures. The results showed that peridor was the most effective binder relative to bentonite and lime. For all types of binders, the increase in bin...

full text

the effect of taftan pozzolan on the compressive strength of concrete in the environmental conditions of oman sea (chabahar port)

cement is an essential ingredient in the concrete buildings. for production of cement considerable amount of fossil fuel and electrical energy is consumed. on the other hand for generating one tone of portland cement, nearly one ton of carbon dioxide is released. it shows that 7 percent of the total released carbon dioxide in the world relates to the cement industry. considering ecological issu...

Occupational and biological monitoring of workers exposed to airborne dust in Gol-e-Gohar Iron Ore mine: A Case-Control Study

Background and aims: Mining is categorized with considerable exposure to airborne contaminations. Regarding the high prevalence of diseases and the high population of workers in iron ore mines, the aim of this study was to investigate the effect of miners’ exposure to respirable dust compounds on the serum Malondialdehyde (MDA) levels. Methods: In this study, 92 non-smoker healthy workers of G...

full text

the effects of error correction methods on pronunciation accuracy

هدف از انجام این تحقیق مشخص کردن موثرترین متد اصلاح خطا بر روی دقت آهنگ و تاکید تلفظ کلمه در زبان انگلیسی بود. این تحقیق با پیاده کردن چهار متد ارائه اصلاح خطا در چهار گروه، سه گروه آزمایشی و یک گروه تحت کنترل، انجام شد که گروه های فوق الذکر شامل دانشجویان سطح بالای متوسط کتاب اول passages بودند. گروه اول شامل 15، دوم 14، سوم 15 و آخرین 16 دانشجو بودند. دوره مربوطه به مدت 10 هفته ادامه یافت و د...

15 صفحه اول

the effects of planning on accuracy and complexity of iranian efl students’ written narrative task performance

this study compared the different effects of form-focused guided planning vs. meaning-focused guided planning on iranian pre-intermediate students’ task performance. the study lasted for three weeks and concentrated on eight english structures. forty five pre-intermediate iranian students were randomly assigned to three groups of guided planning focus-on-form group (gpfg), guided planning focus...

15 صفحه اول

My Resources

Save resource for easier access later

Save to my library Already added to my library

{@ msg_add @}


document type: thesis

وزارت علوم، تحقیقات و فناوری - دانشگاه شیراز - دانشکده علوم

Hosted on Doprax cloud platform doprax.com

copyright © 2015-2023