Cost Analysis in Construction of Underground Mining Structures and Opportunities for Their Reduction

Doneva, Nikolinka; Despodov, Zoran; Mirakovski, Dejan; Hadzi-Nikolova, Marija; Mijalkovski, Stojanče

doi:10.17794/rgn.2015.2.1

Cited by 3 publications

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“…Supporting time is increased in the same working environment due to increasing crosssection. So the time at the largest cross section -3, is 10% larger (in working environment -schist) than the costs in cross-section 1 (Doneva et al, 2015).…”

Section: Time Required For Construction On 1 M' Of Each Horizontal MImentioning

confidence: 95%

Two parametric functional dependents of time for construction of horizontal mining facilities in gneiss and schist

et al. 2019

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This paper presents the analysis of the construction of horizontal mining facilities where 18 variants of mining facilities were developed. The aim of this research was to determine the required time for construction of all variants and then to reduce it to the time required for construction of 1 m` per facilities. Also the required time for construction of 1000 m' of the same facilities is calculated. Based on analysis, two parametric functional dependents of construction time are determined in relation of uniaxial compressive strength of rock mass and the size of the facilities` cross section.

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Section: Time Required For Construction On 1 M' Of Each Horizontal MImentioning

confidence: 95%

Two parametric functional dependents of time for construction of horizontal mining facilities in gneiss and schist

et al. 2019

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“…There is also an optimal compromise in this area. In this context, the problem of normalizing the power steps of transformers also arises because it is not advisable to use a number of different types of devices, both in terms of manufacturing costs (serial effect) and maintenance costs in respect to a certain number of devices of each type (Doneva, Despodov, Mirakovski, Hadzi-Nikolova, & Mijalkovski, 2015;Krawczyk, Majer, & Krzemien, 2016;Cichy, Sakowicz, & Kaminski, 2018).…”

Section: Introductionmentioning

confidence: 99%

Economic criteria for optimizing the number and load factor of mining transformers

Păsculescu¹,

Pana²,

Pasculescu³

et al. 2019

Min. miner. depos.

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Purpose. This article discusses how to choose the optimal number and load factor, respectively the economic power in the first year of mining power transformers operation. The analysis is carried out based on technical-economic criteria. In this regard, two economic criteria are proposed for a detailed analysis, namely the minimum updated total expenses criterion and the minimum power and energy losses criterion. Methods.For determining the number and the optimal load factor, the paper presents mathematical models for the two eco-nomic criteria used. The results obtained by the presented methods are simulated using Matlab for several series of under-ground mining transformers. Also, it is assumed that the load remains constant over the year.Findings. The article confirms the possibility of using the analyzed economic criteria for establishing the optimal number of mining transformers as well as the optimal load factor, respectively the optimal power for the first year of operation. The difficulty of the research is related to the loss time assessment. Also, the paper presents the performed comparative analysis of the two implications.Originality. This research provides a novel approach, by the detailed presentation of the two criteria used for describing the objective functions which have to be minimized in order to gain the optimum, referring strictly to mining transformers, which represents a novelty for power engineering in mining.Practical implications. The methods described in the article can be successfully used in the case of new mining power networks which are going to be designed, and in the case of those currently in operation. Economic criteria analysed also provide results for the economical regime of mining transformers which corresponds to minimum energy loss. Therefore, this case also results in significant energy savings, i.e. lower economic criteria used.

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Environmental and Occupational Noise Management Process in Cement Industry

Hadzi-Nikolova¹,

Mirakovski²,

Doneva³

et al. 2019

Safety Engineering

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The main environmental issues associated with cement production are the consumption of raw materials, energy use and emissions in the air. Noise emissions occur throughout the whole cement manufacturing process - from preparing and processing raw materials, from the clinker burning and cement production process, from material storage as well as from the dispatch and shipping of the final products. The heavy machinery and large fans used in the cement manufacturing process can give rise to noise emissions. Cement Plants are required to comply with standards for reduction in line with national legislation, and to conduct measurements and perform noise surveys. Having this in mind, A TITAN Group Usje Cement Plant in Skopje, following their strong commitment to high environmental performance and Corporate Social Responsibility and Sustainable Development Policy in 2013-2014 have engaged an AMBICON Lab (Faculty of Natural and Technical Sciences) from Stip, to conduct a Noise Control Study in order to identify noise sources within cement plant and marl quarry, determine their impacts on nearby residents and develop noise control/protection strategies. During the past three years, the Usje Cement plant has implemented most of the noise control measures proposed in this Study. Also, a follow-up study during 2016-2017 was conducted in order to assess the effectiveness of measures taken. This paper presents the outcomes of noise reduction measures taken. Keywords: noise, cement industry, process management, measures, environment

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Cost Analysis in Construction of Underground Mining Structures and Opportunities for Their Reduction

Cited by 3 publications

References 0 publications

Two parametric functional dependents of time for construction of horizontal mining facilities in gneiss and schist

Two parametric functional dependents of time for construction of horizontal mining facilities in gneiss and schist

Economic criteria for optimizing the number and load factor of mining transformers

Environmental and Occupational Noise Management Process in Cement Industry

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