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Conveyor Design for Safety and Maintenance
By R. T. Swindeman
"INTRODUCTION This paper will discuss the topics in the recently released Conveyor Equipment Manufacturers Association’s (CEMA) Belt Conveyors for Bulk Materials, 7th edition, that deal with safety an
Jan 1, 2015
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Interaction of dust with the DC plasma arc - a computational modelling investigation (48774a53-c126-481b-8630-879d3aef53c9)
By Q. G. Reynolds
The presence of dust and fume suspended in the freeboard region is a common feature of the operation of direct current (DC) plasma smelting furnaces. This occurs primarily as a result of the use of fi
Jan 1, 2015
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Stability Assessment of Rock Slopes: Towards an Inverse-Reliability-Based Methodology
By Xiang Li, Xibing Li
It is paramount that the stability of rock slopes be correctly accounted for under diverse operating and environmental conditions. Owing to different sources of uncertainty entailed in such stability
Jan 1, 2015
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Project Development
By Randy McMeekin, Chris Twigge-Molecey, J. Peter Blake
The business objectives of a metallurgical project determine targets and constraints, such as the range of products, production capacities, in-service dates, and capital and operating cost parameters.
Jan 1, 2015
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Positive Risk Management: Hidden Wealth in Surface Mining
By J. A. Luckmann
"SynopsisThe purpose of this paper is to introduce an innovative approach to risk management in surface mining operations, namely, positive risk. Traditionally, risk management focused on mitigating l
Jan 1, 2015
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Introduction to the production of clean steel
By L. du Preez, J. D. Steenkamp
This paper introduces the concept of clean steel production from a pyrometallurgist’s perspective to the broader metallurgical community. A simplistic overview of the steelmaking process from iron ore
Jan 1, 2015
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Sprayed Concrete for Underground Excavations — A Status Report
By B. C. Viljoen
"SynopsisCommencement of the next phase of the Lesotho Highlands Water Project is a year or so away from becoming reality. Some 50 km of tunnels in the form of access adits, shafts, diversion tunnels,
Jan 1, 2015
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Solving Mine Drainage Water Issues with Peat-Based Sorption Media
By P. Eger, D. Green
"The Soudan Mine was Minnesota’s first iron mine, operating from 1882 to 1962. The mine was donated to the State of Minnesota in 1963 and became a state park in 1965. The mine discharge contains eleva
Jan 1, 2015
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Variability of In Situ Stress: The Effect of Correlation between Stress Tensor Components
By J. P. Harrison, K. Gao
It is well known that in situ stress measurements at a given site will generally display significant variability. However, it appears that a robust analysis of such measurements – i.e., one that is fa
Jan 1, 2015
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Distribution Regularities of In-Situ Stress Field of Asymmetric Valley of Baihetan Hydropower Station
By Rong. G., T. Q. Lin, W. Du
Based on analysis of the evolutionary history of the valley in Baihetan, the mechanism of asymmetrical evolution, gradual migration-incision evolved from left bank to the right, is revealed in Baiheta
Jan 1, 2015
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Numerical Analysis on Spalling Failure in Rocks using a Continuous-discontinuous Method
By F. S. Su, P. Z. Pan, X. T. Feng, F. Yan, W. W. Ji
"This paper aims to simulate the spalling failure behavior in hard rock based on a self-developed numerical model, i.e. a rock discontinuous cellular automaton (RDCA). A crack initiation and propagati
Jan 1, 2015
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Estimating Rock Mechanics Parameters through Shear Wave Analysis with Well Cad
By William R. Kohl, Craig B. Clemmens
"Since 2010, North Central Resources, Bridgeport, WV, has been using the sonic log to estimate the rockmechanics properties of the coal and adjacent strata in their exploration drilling program. In 68
Jan 1, 2015
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Hydrometallurgical Recovery of Zinc, Manganese and Lead from Pyrometallurgy Sludge
By J. -F. Blais, M. -O. Simonnot, J. Mocellin, G. Mercier, J. -L. Morel
Large quantities of ferromanganese sludge are generated as waste material by blast furnace during the manufacturing of ferromanganese. These slags are very rich in manganese, zinc and lead (5 to 40 %)
Jan 1, 2015
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Hydraulic Fracturation Simulated by a 3D Coupled HM-DEM Model
By B. Chareyre, H. Pourpak, L. Scholtès, E. Papachristos
"Numerical methods used to study hydraulic fracturing in low permeability rock masses need to take into account the interaction between the progressive failure mechanism of the intact rock matrix and
Jan 1, 2015
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Blasting Effects on Pore Pressure in Coal Impoundments (Dry Conditions - Part I)
By Joshua Micah Hoffman, Jhon Silva-Castro, Kylie Larson-Robl
A coal mine impoundment failure has the potential to be environmentally devastating and life-threatening. It is well documented that after seismic events slope failures in impoundments can occur. It h
Jan 1, 2015
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Laboratory Studies on Creep Behavior of Grouted Tensioned Rebar in Weak Strata
By Joseph Hirschi, Naga S. Y. Tirumalaraju, Aditya Mishra, Anthony (Sam) J. S. Spearing
"Primary roof support in underground coal mines in the USA consists mostly of fully grouted passive rebar or grouted (partially or fully) tensioned rebar. Research conducted at two room-and pillar coa
Jan 1, 2015
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Short-Time Heat Treatment of Aluminium Alloy Sheet for Laser-Assisted Clinching
By Olaf Kessler, Jan Kalich, Michael Reich, Julia Osten, Uwe Füssel
Modern automobile bodies consist of different materials, e.g. aluminium alloys and high strength steels. Mechanical joining, e.g. clinching, is very suitable for joining aluminium and steel sheet. But
Jan 1, 2015
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Comparison of Structure Response to Hard and Soft Rock Blasting
By C. T. Aimone-Martin, V. L. Rosenhaim
The response of two structures to blast-induced ground vibrations were evaluated and compared in order to quantify the impact of different blasting operations, hard rock and soft rock blasting, upon t
Jan 1, 2015
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Application of Response Surface Methodology to Model Dependence of Strength and Deformabilty of Limestone Rock on Intact Specimens Shape Deviations
By P. Mišcevic, B. Kavur, I. Vrkljan, N. Štambuk Cvitanovic
It is known from earlier and recent research that mechanical properties of intact rock like uniaxial compressive strength (UCS), Young's modulus (E) and Poisson's ratio (?) are influenced by shape dev
Jan 1, 2015
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Development of Hydraulic Fracturing Technology for Hard Roof Weakening in Chinese Coal Mines
By H. P. Kang, Y. J. Feng
The hard roof in underground coal mines is generally considered as a main cause that induces disasters in working faces and entries, such as rock burst and windblast. Hydraulic fracturing technology i
Jan 1, 2015