Browse

Drilling rate is one of the main determinants of drilling cost. The performance of any drill bit is affected by the complex interaction of numerous factors. The principal factors that require consideration in predicting drilling rate, particularly for mining application, are the characteristics of the rock and the operating parameters of drilling machine. In this paper, the most important operating parameters of drilling machine were reviewed using many basic studies on drilling rate and dillability since 1956. Th...

A standard imaging method in seismic data processing is the simulation of a zero offset section from seismic reflection data. In traditional imaging methods, e. g. NMO/DMO/stack, an accurate macro velocity model is needed. Common reflection surface (CRS) stack is a new data driven method, introduced in recent years which remove the necessity of making this model and just use the surface velocity to simulate zero offset section (2D) or volume (3D). In this article, we drive the CRS stacking on a synthetic data to o...

Fly rock is one of the reluctant phenomenon in blasting operation. Several factors are effective in producing fly rock. As a whole, these factors can be divided into two groups; controllable parameters (blasting pattern) and uncontrollable parameters (geo-mechanical characteristics). One of the most important controllable parameters in blasting operation is blast hole diameter. Proper diameter is the diameter which is optimum from technical and economical point of view. Normally, statistical methods can be used fo...

Within the scope of this study, Kuz-Ram and JKMRC fragmentation estimation models were applied to bench blasting operations and pros and cons of models were determined by comparing estimation results with the real fragmentation results obtained from digital image processing technique. On the other side, bench blast optimization method by means of models and digital image processing technique, is introduced in order to get desired fragmentation result from bench blast.

There are two methods fixed and real-time assignment for improving the performance of transportation through truck- shovel system in open pit mines. The real-time assignment (RTA) method is a better manner for optimization process of transportation system in open pit mines, especially in the complex transportation systems. The most significant objective of the RTA method is, introducing a transportation system which cause to increasing production per time and decreasing cost per ton. In this study, a software base...

In current paper the purposes of an environmental assessment are described and the method, through which the “Impacting Factors” and “Environmental Components” are determined, is also outlined. Then, according to the definition, possible scenarios, and matrixes of weighting factors, the algorithm which shows the relation between Impacting Factors and Environmental Components is determined. Furthermore, the derivation of matrixes and the method of environmental assessment are described. In order to compare ...

The Normalized Full Gradient (NFG) method was introduced in the mid of 1960s. This method generally uses for interpretation potential field data in order to detect gravity and magnetic anomalies. The NFG value represents the full gradient of the magnetic anomaly at a point divided by the average of the full gradient at the datum. The closed maxima on a NFG map indicate the occurrence and the horizontal locations of the centers of magnetic anomalies related to iron deposits. By means of this map, we can select bore...

Determination of mechanical parameters of rock materials and using them as an input data-base are important in rock engineering design studies. The standard test procedures to determine mechanical parameters of rocks have been developed and they have been applied for up to 40 years. But these tests require special samples and after preparation, the samples are tested by giving damage to them. The electrical conductivity method has been used to determine porosity, fault or discontinuity in rock mass without giving ...

In this paper a combined (hybrid) model of fix and flexible with its software were presented. In the model, initially the trucks assignment operation using the fix approach was done and in the end of trucks operation cycle in the flexible method, trucks dispatching method was started. Results of fix assignment method implementation in each transportation scheduling period were used in the mentioned software and finally the fitness and most suitable shovel and truck combined system for the real-time assignment was ...

This paper presents a study for leaching kinetics of chalcopyrite concentrate in acidic potassium dichromate solution. For this purpose effects of stirring speed in the range of 100-400 rpm, sulphuric acid (H2SO4) concentration in the range of 0.1-0.5 M, potassium dichromate (K2Cr2O7) concentration in the range of 0.02-0.1 M, leaching temperature in the range of 20-90В°C, particle size fractions of 212x106, 106x75, 74x45, 45x38 and minus 38 $\mu$m and solid/liquid ratio in the range of 10-200 g/L on copper dissolu...

Peak particle velocity is the most important criterion for analyzing dangers resulted from ground vibration. According to the investigations, this parameter can independently indicate the possible damage and is proportional to it. Up to now, investigators have proposed many different formulas to calculate this parameter, but none of them are applicable for all areas and based upon regional conditions such as geological, technical, geotechnical, rock mechanical and so on, only one of these equations can be adopted....

The economical investigation is one of the most important stages in the mine planning, as it can be a useful guide in the mine exploitation. The iron ore district of Gol-E-Gohar (GEG) is located about 60 km south-west of the city of Sirjan, in the Kerman Province of the Islamic Republic of Iran. Six anomalies are known and for about 10 years, Area 1 ore is mined and processed for the recovery of a dry as well as a wet concentrate. The proven reserves of Area 1 were about 265 million tonnes, whereas near to 100 mil...

Fluid inclusion application in epithermal gold exploration is based on the fluid inclusion characteristic and its relation to the mineralization. These characteristics include the type of fluid inclusions and different fluctuations in their micro thermometry measurement and chemical composition. In this regard, based on the micro thermometry measurements, the fluid inclusions in epithermal gold systems have the homogenization temperatures between 100-300 ВєC and the salinity of 5\% NaCl equiv. in average. Within t...

Gold mining is attracting increasing attention in many countries of the world, although it has a major impact on the environment. Large quantities of hazardous chemicals such as mercury or sodium cyanide are consumed to recover gold from its ores. Therefore, this activity should be carefully regulated by means of global directives based on an up-to-date knowledge of ecotoxicity principles and modern environmental standards. In light of recent developments in world gold mining, T\"urkiye has caught the attention of...

In these report we represent the researches made by on original method for determination of the hydraulic friction factor in case of gas transport in gas distribution system. We made comparative analyses of results received by: the theoretical determination of the hydraulic friction factor, its experimental determination and the mathematic model of the process. The stend of experimental determination of aerodynamic loss is development. On the basis of the analysis and obtained result is defused a formula of analyt...

Making macro velocity model is the most important part in any seismic data processing system. It is a very time consuming and none accurate step in conventional methods like NMO/DMO/stack. In this article, we drive a velocity model for a synthetic data with new introduced tomographic inversion method. This method uses the kinematic wavefield attributes which would yield from common reflection surface (CRS) stacked data. These attributes are normal (N) wave and normal incidence point (NIP) wave curvatures. The tomo...

Choosing a suitable method for a given ore-body is very important for the economics, safety and the productivity of the mining work. Ore excavation cost, as economic factor, have not influence on preliminary selection of mining method. Mining-geological factors and mining-technical factors have higher ascendancy in this stage of selection. It is very difficult to insulate one of these factors as the most significant. Today, the selection of a mining method is a multi-criteria decision making process, with many fac...

Few algorithms are available for economic optimization of stope boundaries and underground mining area. The algorithms may be classified as rigorous and heuristic. The rigorous algorithms are those which benefit from the mathematical proof and provide the true optimal solution according to the conditions and environment they are applied. The heuristic algorithms are based on searching for the optimal solution according to some rules. They may not guarantee to find the true optimum but provide the approximate solut...

Checking the quality of blasting is considered an essential matter in surface mining, and requires measuring objective parameters. One of these parameters is the results of the blasted product. Numerous fragmentation “measuring” systems have been developed and marketed, based on image-processing. In this study, the GoldSize system was used to determine the size distribution of rock fragments in Sarcheshmeh Copper complex mine, Iran. The effects of size of rock samples and imaging method on image analysis are i...

The Gol-E-Gohar (GEG) Iron ore Complex is located in Kerman province of Iran, and is situated on the Sanandaj-Sirjan metamorphic belt, which has been played a large part in the history of the tectonics of Iran plate margin. Based on the modern exploration activities, six magnetic anomalies in this district have been recognized. Now a large-scale open-pit mine is being developed on this deposit. This paper aims to re-evaluate the pre-designed slope angles of Anomaly 1 of GEG Open pit. In the preliminary design the ...

This paper presents the results of ground vibration analysis induced by blasting during the construction of the Istanbul Kadık\"oy-Kartal metro tunnel. Different rock formations in this tunnel route which is 21,6 km in length were encountered during the excavation with blasting. As a first stage, Test site is divided into 3 main regions with respect to lithology changes in the rock units and Hoek’s Geological Strength Index value of these rock units. In the first region representing S8 shaft tunnels, 59 events ...

In the open-pit mining industry, trucks and shovels are the mining technology of choice; however, it is widely recognized that the operation of these trucks and shovels contributes significantly to the overall operation cost. Fortunately, there exist many opportunities to reduce the cost of the truck and shovel operation. Chador-malu iron ore mine has been exploited since 1997. This deposit is located in the North-East of Yazd province and reserve of this deposit is about 400 million tons. At present, there is a n...

In geochemical stream sediment surveys in Moghangegh Region in NW of Iran, sheet 1:50,000, 152 samples were collected and after analyze and processing of data, it is revealed that Yb, Sc, Ni, Li, Eu, Cd, Co, As contents in one sample is far higher than other samples. After detecting this sample as the outlier sample, affect of this sample was investigated in multivariate statistical data processing to investigate destructive effects of outlier sample existence in geochemical exploration. Pearson and spearman corre...