ORIGINAL_ARTICLE
Selection of the best strategy for Iran's quarries: SWOT-FAHP method
Iran has high potential and unique stone reserves in terms of variety of color, texture, quality, and economic value; nevertheless, in spite of growing mine production during the past decade, in many instances this potential has been overlooked. Therefore it is necessary to investigate strategic factors of these mines. The purpose of this study is to evaluate and determine the best strategies for Iran’s quarries. To this end, the mines were analyzed using the Strengths, Weaknesses, Opportunities and Threats (SWOT) approach in combination with Fuzzy Analytic Hierarchy Process (FAHP). Firstly, an environmental analysis was performed and then the SWOT factors were identified. In this way, the sub-factors which have very significant effects on the mines were determined. Using the SWOT matrix, alternative strategies were developed. Subsequently, the strategies were prioritized and the best strategies for these mines were determined. The results show that conservative strategies are the best strategy group for Iran’s quarries.
https://jme.shahroodut.ac.ir/article_71_de8cc8521d081b77de542ffec06aac01.pdf
2012-09-30
1
13
10.22044/jme.2012.71
SWOT
Fuzzy AHP
Decision factors
Strategy
Quarry
M. M
Tahernejad
1
uni
AUTHOR
M.
Ataei
ataei@shahroodut.ac.ir
2
Shahrood university of technology
LEAD_AUTHOR
R
Khalokakaie
3
uni
AUTHOR
ORIGINAL_ARTICLE
Environmental Hazards Associated With Mining Activities in the Vicinity of Bolivian Poopó Lake
Hydrographically Bolivian Poopó Lake is located in the basin of Desaguadero River and it has over a dozen main tributary rivers and other smaller rivers with lower flow. The mine water discharge from the abandoned and current mining activities polluted these rivers by carrying heavy metals, dissolved and suspended solids which in turn polluted the Poopó Lake which is considered as an important Lake in this area. The present paper deals with the environmental hazards associated with the mining activities with an objective of determining the environmental quality of the Poopó Lake and its tributary rivers, based on physical-chemical analysis of superficial water and sediment samples. The results of the research show that the Poopó Lake water quality can be classified as highly saline, containing high concentration of dissolved or suspended solid, as well arsenic, lead, cadmium, zinc and other heavy metals exceeding the permissible limits of pollutants. Desaguadero River contributed to the Poopó Lake pollution by 70% arsenic, 64% lead, 4.27% zinc and 2.18% cadmium. Other important pollution contributors are Antequera River by 57 % zinc, 32.9 % cadmium and 0.66% lead, and Huanuni River by 61.2% cadmium, 2.23% lead and 34.3% zinc. Vinto foundry, Kori kollo mine and mainly San José mine polluted the Poopó Lake by arsenic and lead through Desaguadero River. Bolivar and Huanuni mines polluted the Poopó Lake by cadmium and zinc through Antequera and Huanuni Rivers. Additionally the mining activities continue to pollute the Poopó Lake by dissolved and suspended solids transporting through Desaguadero, Antequera and Huanuni rivers.
https://jme.shahroodut.ac.ir/article_72_7924c2f965f4af633d94472f5ea42d3f.pdf
2012-10-20
15
26
10.22044/jme.2012.72
Lake
Mining
environmental
pollution
heavy metal
dissolved and suspended solids
V.F
Navarro Torres
1
Natural Resources and Environmental Center, Mining Engineering and Geo-resources Department of IST, Technical University of Lisbon, Portugal, Av. Rovisco Pais 1049-001, Lisbon, Portugal
AUTHOR
G
Zamora Echenique
2
Technical University of Oruro, Bolivia
AUTHOR
R.N
Singh
3
Nottingham Centre for Geomechanics, Department of Civil Engineering, Nottingham University, Nottingham, UK
LEAD_AUTHOR
ORIGINAL_ARTICLE
Development of a new creep testing equipment to obtain long-term deformation parameters of salt rocks
Creep phenomenon in rock engineering plays a key role in development of underground spaces as they must be stable enough for a long period of time. Current research involved designing and manufacturing of a new creep testing machine. The equipment is capable to perform simultaneous light-duty creep tests on more than one cylindrical rock samples at a very low cost.To evaluate the equipment’s performance, a series of creep test was performed on salt rock samples and their axial and lateral deformations were measured by dial gauges. Measurements were taken under constant temperature, humidity and sustained loads. The results revealed that the creep rate in lateral direction was far greater than in the axial direction. Another important conclusion was that both axial and lateral creep curves follow the same pattern with an idealized salt rock creep curve. Also, experiments indicated that the steady state creep rate increases with increasing initial stress state. Also, initial stress state showed a great influence on salt primary creep response.
https://jme.shahroodut.ac.ir/article_42_cde0c95052782a92eecb23cbcf8ba26b.pdf
2012-06-05
27
32
10.22044/jme.2012.42
Long-term creep
Uniaxial Creep Test
salt rock
lever arm
rock testing standards
S.M.A
Hosseini
hosseini.ma@gmail.com
1
PhD candidate, shahrood university of technology
LEAD_AUTHOR
F
Sereshki
farhang@shahroodut.ac.ir
2
Associate professor, shahrood university of technology
AUTHOR
M
Shariati
mshariati@shahroodut.ac.ir
3
Professor, shahroodu university of technology
AUTHOR
S.M.E
Jalali
jalalisme@shahroodut.ac.ir
4
Associate professor, shahrood university of technology
AUTHOR
F
Crotogino
fcrotogino@solutionmining.org
5
Independent engineer, KBB underground
AUTHOR
ORIGINAL_ARTICLE
Back-calculation of mechanical parameters of shell and balls materials from discrete element method simulations
Discrete Element Method (DEM) is extensively used for mathematical modeling and simulating the behavior of discrete discs and discrete spheres in two and three dimensional space, respectively. Prediction of particles flow regime, power draw and kinetic energy for a laboratory or an industrial mill is possible by DEM simulation. In this article, a new approach was used to assess the main parameters of a transparent ball mill constructed in mineral processing laboratory of the University of Tehran. The mill shell and crushing balls are made of Plexiglas® and compressed glass respectively. The true values of mechanical parameters for these materials, required for DEM modeling, were unknown. The authors back-calculated the best values of mechanical properties of Plexiglas and compressed glass materials based on a large number of DEM simulations. Back-calculation procedure was mainly based on the comparison between electrical power draw measured in real mill and mechanical power draw calculated by DEM model while trying to simulate particle flow regime inside the real mill accurately. The results showed that the optimal number and design of lifters can be adequately determined by improving torque and kinetic energy in crushing elements through DEM simulation trials based on the back-calculated mechanical parameters.
https://jme.shahroodut.ac.ir/article_74_73e46dff5f6e20b943ed433112b95963.pdf
2012-10-27
33
40
10.22044/jme.2012.74
DEM model calibration
lifter design optimization
modeling and simulation
DEM simulation validation
Akbar
farzanegan
farzanegan@ut.ac.ir
1
University of Tehran
LEAD_AUTHOR
Bahareh
Arabzadeh
arabzadeh_bahareh@yahoo.com
2
University of Tehran
AUTHOR
Vahid
Hasanzadeh
hasanzadeh.vahid@gmail.com
3
University of Tehran
AUTHOR
ORIGINAL_ARTICLE
Formation interface detection using Gamma Ray log: A novel approach
There are two methods for identifying formation interface in oil wells: core analysis, which is a precise approach but costly and time consuming, and well logs analysis, which petrophysists perform, which is subjective and not completely reliable. In this paper, a novel coupled method was proposed to detect the formation interfaces using GR logs. Second approximation level (a2) of GR log gained from optimum mother wavelet decomposition was used for formation interface detection. Short time Fourier transform (STFT) of a2 was gained since the window band was fixed in the entire of well depths. Inverse STFT of various windows of transformed data was gained, which creates various signals in depth domain. To this end, a novel formulation was developed to obtain modified signal for formation interface detection. The mean of various resulted signals creates a smooth signal the logarithm well of which highlights formation interfaces. Synthetic data were used to test the applicability of proposed algorithm. Accordingly, GR logs corresponding to five different wells located in an oilfield in south of Iran also were used to investigate the accuracy and applicability of the proposed method. Lastly, the validation process took place by comparing the results of core data analysis and the proposed method. Good agreements were obtained between these approaches, demonstrating the applicability of the proposed methodology.
https://jme.shahroodut.ac.ir/article_66_d1a3d4b87e4a0276c92e677f4dc11069.pdf
2012-09-17
41
50
10.22044/jme.2012.66
Formation interface
Wavelet Transform
Short time Fourier transform
GR log
Mostafa
Javid
m.javid84@gmail.com
1
University of Tehran
LEAD_AUTHOR
Behzad
Tokhmechi
tokhmechi@alumni.ut.ac.ir
2
Shahrood university of Technology
AUTHOR
ORIGINAL_ARTICLE
Box-Behnken Design of Experiments Investigation forAdsorption of Cd2+ onto carboxymethyl Chitosan Magnetic Nanoparticles
The main objective of the present study is to investigate the feasibility of using Carboxymethyl chitosan magnetic nanoparticles (CCMN) for the adsorption of Cd2+. The study also reports important parameters, which affect the adsorption process, i.e., pH, adsorbent dose, contact time and concentration of Cd2+, using Box-Behnken designs. Firstly, functional carboxymethyl chitosan magnetic nanoparticles (about 33 nm) was prepared by chemical coprecipitating and characterized by means of scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier Transform infrared spectroscopy (FTIR). Then, CCMN was used as the adsorbent for the treatment of effluent. The ANOVA result of the full model shows that pH, adsorbent dosage and metal concentration had a significant effect on metal removal. In addition, this parameters indicates which contact time variable does not have a significant effect (p>0.05).
https://jme.shahroodut.ac.ir/article_76_dab1e5fce85016f2693530944b161369.pdf
2012-11-05
51
59
10.22044/jme.2012.76
experimental design
nano magnetic
carboxymethyl chitosan
Cd2+
A
Igder
a.igder31@gmail.com
1
Department of Mining, Faculty of Engineering, IKIU
LEAD_AUTHOR
Ali Akbar
Rahmani
2
Department of Mining, Faculty of Engineering, IKIU
AUTHOR
Ali
Fazlavi
3
Department of Mining, Faculty of Engineering, IKIU
AUTHOR
Mohammad Hossein
Ahmadi
mhahmadia58@gmail.com
4
Member of chemistry group
AUTHOR
Mohammad Hossein
Ahmadi Azqhandi
5
Department of Chemistry, Faculty of Science, IKIU
AUTHOR
Mohammad Hassan
Omidi
6
Department of Chemistry, Faculty of Science, IKIU
AUTHOR
ORIGINAL_ARTICLE
The effect of price changes on optimum cut-off grade of different open-pit mines
Maximizing economic earnings is the most common goal in cut-off grade optimization of open-pit mining operations. When this is the case, the price of the product has a critical effect on optimum value of cut-off grade. This paper investigates the relationship between optimum cut-off grade and price to maximize total cash flow and net percent value (NPV) of operation. In order to visualize this relationship, two hypothetical mines were employed. To determine the optimum value of cut-off grade in different cases, two nonlinear programming models were formulated, and then, all models were solved using Solver in Excel. The results show that the optimum cut-off grade would always be a descending function of price when we intend to maximize total cash flow. On the other hand, this function may be descending or ascending when we intend to maximize NPV. This result also reveals that both maximum cash flow and maximum NPV always increase and decrease, respectively when the price of product increases or decreases.
https://jme.shahroodut.ac.ir/article_75_8bb3f54bfd0ea8516efcc5b09b7a968f.pdf
2012-11-05
61
68
10.22044/jme.2012.75
Cut-off Grade
Open-Pit Mine
Net Present Value
Opportunity Cost
Cut-off grade-price relationship
Ali Asghar
khodaiari
khodaiar@ut.ac.ir
1
LEAD_AUTHOR
A
Jafarnejad
2
PhD in Industrial Management Faculty of Management, University of Tehran, Iran
AUTHOR