VOL. 12, NO. 19, OCTOBER 2017 ISSN 1819-6608 ARPN Journal of Engineering and Applied Sciences © 2006-2017 Asian Research Publishing Network (ARPN). All rights reserved. www.arpnjournals.com 5447 CALCULATION OF LOSS VOLUMES AND DILUTION OF MINERAL DEPOSITS IN NEAR-CONTACT ZONES Sergey Antonovich Vokhmin 1 , Alexey Aleksandrovich Kytmanov 2 , Georgij Sergeevich Kurchin 1 , Yuri Prokopevich Trebush 1 and Aleksandr Konstantinovich Kirsanov 1 1 Siberian Federal University, Krasnoyarsk, Rabochiy Avenue, Russia 2 Siberian Federal University, Krasnoyarsk, Svobodny, Russia E-Mail: sergey.a.vokhmin@mail.ru ABSTRACT In Russia, the mineral resource base is used on a particularly large scale, and the mining complex is essentially a basic industry for the maintenance and development of our country's economy. It determines the need for a careful and responsible attitude to our subsoil riches – mineral deposits. In this regard, minimizing the level of losses and dilution of ore becomes one of the key requirements for the stoping technology. The highest levels of ore losses in an array are formed in mining areas of ore bodies contact with the host rock mass as a result of a mismatch between the mining contour and the geological contact surface. The complexity of the contact of ore and host rocks is usually characterized by the so-called "stochastic contact area". The technological complexity of ore mining at the ore-rock contact is determined by variability of geometric parameters of the "stochasticity zone" on the geologic contact plane. In this article, the issues on setting of losses and dilution when mining the near-contact zones are discussed. The method of calculating the specified values of losses and dilution in the stochasticity zone is provided. The authors developed an algorithm for determining the profile of contact. In the stochasticity zone, a contact can take a rectangular, sinusoidal, sawtooth or straight profile. The research showed the influence of contact profile on the level of losses and dilution of ore; the formulas for calculating the ratios are provided. When using the proposed method, it is possible to most easily and reliably determine the specified values of ore losses on the contacts. Keywords: losses, dilution, near-contact zone, mineral deposits, ore. 1. INTRODUCTION 1.1. The problem When extracting minerals, minimizing the level of losses and dilution of ore becomes one of the key requirements for the stoping technology. This is due to the fact that the high losses of minerals in mining entail more rapid depletion of deposits, as well as the need to increase the capacity of mining companies. The reduction of quality losses (dilution of minerals) is of equal importance. Dilution causes significant economic losses in the process of production and processing. The associated with dilution excessive extraction of mining wastes that are then allocated to tailings in enrichment, in addition to the economic damage, also causes a significant damage to the environment, as the allocation of large areas for dumps and tailings storage facilities is required. At the same time, reaching the level of deposits extraction approved by the technical project on the field development may not always be beneficial for an enterprise. In the process of deposit development, the mining and geological situation, the technical means of mining operations, as well as the design parameters of the technological units, may change. Usually, the mining and geological situation complicates, the technical means of mining with higher performance are accepted, and parameters of technological units vary in accordance with the geological situation and the applied technical means of mining. Therefore, achieving a level of mineral deposit loss recorded in the original technical project often requires the significant time and material resources from an enterprise, which negatively affects the cost of production and competitiveness of products on the market. It is therefore necessary to achieve the parity of interests between the state and a mineral developing enterprise. It is achieved through the establishment of science-based standards for loss and dilution in mining [0-[3]]. Specified value of losses and dilution should combine elements of both the respect for the use of identified reserves of raw materials and the economical expenditure of forces and means on their mining and processing [[4]-[5]]. E.I. Panfilov defined the very process of normalization as a set of interrelated acts establishing the in-service field allowable amount (rate) of quantitative losses (extracted from the subsoil), the quality of extractable reserves, and other parameters [[6]]. In [0], the rationing of losses and dilution refers to the establishment of their level and ratio, which are technologically and economically feasible for specific geological and technical-economic conditions of the extraction and processing of minerals. Consequently, standards should take into account the technical and technological possibilities of extracting minerals from the subsoil and the impact on the quality of the extracted mass indices of subsequent technological processes. The rationing should ensure the maximum economic benefit from the exploitation, the most complete