Scientific Mining Journal

Scientific Mining Journal

Volume 56 - No 3 (September 2017)
Final Depth Optimization in Open Pit Mine Planning by Using Mine Cost Optimization Software ( Original Research )
Pages 89 - 97 Tahir Mallı , Doğan Karakuş , Alper Gönen
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The main objective of today`s mine planning is intended to maximize net present value of a project. Income to be earned on a realistic plan close to ideal is evaluated at using Net present value (NPV) technique which is a popular investment appraisal method. This is why it is very important to determine the operating parameters that maximize the NPV. Especially optimum production capacity, depth and dimensions of ore body also determine the economics of mine. Solution of existing mining problems are based on the ideal mine planning and to increase NPV. Mine Cost Optimisation (MCO) software is designed to be aimed at these solutions. In this study, a model is proposed for more precise determination of the open pit final depth and mine life as an important parameter in the evaluation of mining feasibilities by using MCO software and maximization of NPV is aimed. It is thought that this study will bring a different approach to mining investments with a new solution strategy.

An Assessment of Coal and Gas Outburst Occurrences in Turkey and Prevention Methods ( Review )
Pages 99 - 108 Olgun Esen , Gündüz Ökten , Abdullah Fişne
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The coal and gas outbursts which causes loss of life and property in underground coal mining through the worldwide. This event only occurs in the Zonguldak coal basin in Turkey, and it has to immediately be prevented in the collieries of the basin. The sum of 374 workers were died after 90 coal and gas outburst occurrences were experienced in the years between 1969 and 2013. After 2013, coal and gas outbursts were not occurred until today. In this paper, coal and gas outbursts were identified and the mechanism of outburst have been given as a brief summary. Moreover, statistical assessment of outbursts for the Zonguldak coal basin have been made and the prevention methods were summarized.

Coal Blending for Thermal Power Stations ( Review )
Pages 109 - 116 Mustafa Yörükoğlu
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Coal blending which provide increase in efficiency, decrease in repair-maintenance costs and emission of harmful gases in coal fueled power plants, is in the interest of many countries both scientifically and practically. Nevertheless, there are many power plant operators in different countries showing no adequate interest to this important issue. This paper briefly explains the importance of blending, types and methods of blending, total coal quality management and importance of stockyard equipment selection especially for mine-mouth power plants and points out that all these are essential parameters of a good blending.

 

Fundamentals of Thiosulphate Leaching of Gold And Silver - Part I ( Review )
Pages 117 - 130 Fırat Ahlatcı , Ersin Y. Yazıcı , Oktay Celep , Hacı Deveci
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Today, the most common (>90 %) method preferred for production of gold from ores is cyanide leaching. Cyanide leaching with its well-known chemistry has been used industrially since the late 19th century. Restrictions have come in to force particularly in recent years due to ever increasing environmental concerns for high toxicity of cyanide. European Union has once considered a general ban on the use of cyanide; however, they could not apply such a ban due to the lack of an alternative that can economically and technically compete with cyanide. Thiosulphate has received particular attention among reagents alternative to cyanide with its attributes such as low toxicity and high leaching kinetics. Thiosulphate leaching could also provide high recoveries in some refractory ores where cyanide leaching fails. The first commercial application of thiosulphate leaching has been implemented by Barrick Gold Co. in 2015. In this study, historical development of ammoniacal thiosulphate leaching, its technical and environmental merits, leach mechanism and parameters affecting leaching were discussed. Alternative thiosulphate leaching systems were also evaluated.