نشریه زمین شناسی محیط زیست
پیاپی 33 (زمستان 1394)

One of environmental issues in open pit mining is to separate and send of mine wastes with different grade to different waste dumps. In this paper the mentioned subject of short-term production planning is presented. In short-term production planning the subjects of exact contact boundaries between ore and waste, optimizing of extracting ore grade, the sequence of ore blocks’ exploitation and waste blocks’ removal are considered. Using of boreholes’ data of one or two higher working benches is one of the easiest ways of grade estimating in mining bench. For evaluating of presented model in this research, Chadormalu iron ore mine data is used as a case study. In the case study, the place of the bench in elevation of 1465 m is determined as the target bench of production planning. Average and least of iron grade were estimated respectively 57.08% and 53.62%. So, if only estimated grade in reserve estimating step is considered in short-term production planning more than 30% of the ore block’s reserve is transferred to the waste dump. So, the presented model waste dumps with different iron ore grade is planned for potentially future uses.

Natural hazards such as Landslide is as the nature disasters that have many financial and human losses every year. Today advances in science and technology, provided appropriate fields for the study and reduce these natural hazards. In this respect, the geographic information along with decision support tool used to assess the risk of landslides. The aim of this study was to investigate the effects of different factors in the creation and landslide hazard zonation of landslides in Central part of the Semirom city. For this purpose affecting factors were binary compared using analytical method by indicating the weight of each factor as indicator for their effects in occurrence of landslide. Accordingly, the landslide regionalization hazard map was prepared to the use of weighed information layer and weighted coefficient of each factor. Results of this study show that the analytical hierarchy method is precise method for evaluation of landslide potential due to the use of binary comparison affecting factors and considering numerous factors for landslide evaluation at the same time in comparison to the other prevalent method. The results indicates that the percentage of high and very high hazard class is 40.98 percent in AHP method. As well as material and slope were identified as the most important factors in landslide occurrence in the region.

Nowadays geophysical airborne data have high importance for radioactive mineral exploration. In fact these data is major base for radioactive elements exploration. In this study by airborne radiometric data interpretation collected from Hashtrod 1:100000 sheet no. 5464 situated in north Iran expectation areas for uranium, thorium and potassium were recognized. Firstly, statistical parameters were calculated and radiometric element's histograms of the area were drawn using conventional statistics. Moreover, promising maps were drawn based on the dispersion around the mean. Then, concentration- area full logarithm plots were drawn by using fractal method and digit data collected in the area. Next, plots associated uranium, thorium and potassium anomalous areas were prepared after step separation of different environments (background, threshold, anomaly) had been done based on C-A angular coefficient curve. The correlation coefficients between These elements were determined after some tables of data scattering were drawn. The image Ternary radioelement map color space GRB earns in the region and finally to process the images and extract the most important forms of uranium anomalies identified hot area and the introduction of promising deposits of radioactive minerals indexes were examined for discovery proceedings

Kojour mountainous region, located in Mazandaran province due to high altitude, existence marl, lay and shale layers, high seismic activity, dominantly Mountainous topography and high rainfall; available appropriate condition for land slide. Pathway as for geological condition and climate is capable for mass wasting. Experience of many slides after operation subsidiary this subject. In this paper reason of occurrence land slide on 27th kilometer of Kojour pathway, in west of Gateh Kash village survey and studied. For this reason, beneficial of field revisions, study geological maps, aerial photograph and satellite images; basic ingredient in instability at slightly zone survey and studied. According to study this slide is transitional slide and seven factor include lithology, topography, distance of fault, engineering geology of sliding mass, hydrology and hydrogeology, climate and land usage effective and essential in occurrence this slide determine, recognize and analyzed. Obtained safety factor during stability analysis by limit equilibrium indicating slope stability in present condition, but changing in stability effective factor, again sliding is probable. During surveying parts by high potential to sliding recognize, hence for appropriate stabilization operation for hazardous zone offering. Quantities assessment conclusion of environmental effective and weighting on affected parameter of slide with cluster analysis, showed negative impact on environment and meaningful relationship between this parameter.

In this study, we tried to dentify the fractures and faults of Khaviz Anticline, north of Behbahan, by using the ETM satellite images and the Digital Elevation Model (DEM) in the ENVI 4.8 and Arc GIS software environments. Therefore, the lineaments were identified using the linear filters in different directions and the hillShade map constructed from the DEM. Subsequently, the lineaments were compared with the constructed band combinations and the geological map to separate the fractures and faults. Based on the findings, the dominant direction of the fractures and faults follow the northwest-southeast (NW-SE) trend along Khaviz Anticline. Assessment the ISODENSITY map of the faults and fractures indicates that there is the utmost accumulation of the fault and fractures is in the south limb of Khaviz Anticline, Then by considering the important role of fractures and faults in migration of hydrocarbons, the southern flank of this anticline can acts as a suitable area for accumulation of hydrocarbons

This research aims to examine underground water of delfan city in terms of geochemical characteristicsTo this end,the main elements of underground water were analyzed.Based on which all parameters were lower than allowed limit.As the saturation index can be an important factor to understand solvation –setllement of mineral available in underground water ,the saturation index was calculated using computerized code phreeqc.The saturation index of the studied minerals in all water specimens was negative and all considered minerals can be solving.Also ,based on ionic exchange diagrams,sodium and cholor have two different origins and Calcite,Dolomit and Gypsum solvations have occurred from which Calcite and Dolomit solvations were higher.According to the HCA,samples are in two main clusters which Anions-Kations concentration in one cluster samples were higher .According to the clusters stiff diagram the region water type is Bicarbonate –Casic .To find main factor of underground water chemistry ,rotational Varimax method has been used which is the most common PCA,because it gives more interpretable elements.By this method,the limestones and Dolomit,s solvation and rock-water interaction are the most important factors of the region,s underground water chemistry

Bam plain in Kerman province, about 207 kilometers Southeast of the center is located at edge of Lut Desert is an arid country. In this study, all the hydraulic parameters of the aquifer including hydraulic conductivity(K), transmissivity (T) and the thickness of the aquifer (b) has been studied. With the implementation of aquifer pumping test wells observational transfer coefficient is measured and the thickness of the aquifer was estimated using geophysical plain in different directions. The hydraulic conductivity calculated by the formula Darcy and all data processing software for Excel, Surfer and GIS data. Hydraulic parameters, transmissivity coefficient and the thickness of aquifer as zoning plans and results have been interpreted. The results show t
Bam plain in Kerman province, about 207 kilometers Southeast of the center is located at edge of Lut Desert is an arid country. In this study, all the hydraulic parameters of the aquifer including hydraulic conductivity(K), transmissivity (T) and the thickness of the aquifer (b) has been studied. With the implementation of aquifer pumping test wells observational transfer coefficient is measured and the thickness of the aquifer was estimated using geophysical plain in different directions. The hydraulic conductivity calculated by the formula Darcy and all data processing software for Excel, Surfer and GIS data. Hydraulic parameters, transmissivity coefficient and the thickness of aquifer as zoning plans and results have been interpreted. The results show that hydraulic conductivity in parts of eastern and south-eastern lowland plains has been higher that other parts. As well as the ability to transfer coefficient of the aquifer from the northwest to southeast is rising. In general, the thickness of aquifer from the southeast to the northwest and central plains are on the rise. So if a well or aqueduct to exploit groundwater resources in eastern and southeastern plains discharge dig a well than other areas will be plain. Because due to the high permeability sediments above the aquifer transfer coefficient is higher.
hat hydraulic conductivity in parts of eastern and south-eastern lowland plains has been higher that other parts. As well as the ability to transfer coefficient of the aquifer from the northwest to southeast is rising. In general, the thickness of aquifer from the southeast to the northwest and central plains are on the rise. So if a well or aqueduct to exploit groundwater resources in eastern and southeastern plains discharge dig a well than other areas will be plain. Because due to the high permeability sediments above the aquifer transfer coefficient is higher.