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Articles 1 - 21 of 21

Full-Text Articles in Mining Engineering

Detonation Synthesis Of Alpha-Variant Silicon Carbide, Martin Langenderfer, Catherine E. Johnson, William Fahrenholtz, Vadym Mochalin Aug 2019

Detonation Synthesis Of Alpha-Variant Silicon Carbide, Martin Langenderfer, Catherine E. Johnson, William Fahrenholtz, Vadym Mochalin

William Fahrenholtz

A recent research study has been undertaken to develop facilities for conducting detonation synthesis of nanomaterials. This process involves a familiar technique that has been utilized for the industrial synthesis of nanodiamonds. Developments through this study have allowed for experimentation with the concept of modifying explosive compositions to induce synthesis of new nanomaterials. Initial experimentation has been conducted with the end goal being synthesis of alpha variant silicon carbide (α-SiC) in the nano-scale. The α-SiC that can be produced through detonation synthesis methods is critical to the ceramics industry because of a number of unique properties of the material. Conventional ...


Corporate Social Responsibility: Understanding The Mining Stakeholder With A Case Study, Sisi Que, Liang Wang, Kwame Awuah-Offei, Wei Yang, Hui Jiang Aug 2019

Corporate Social Responsibility: Understanding The Mining Stakeholder With A Case Study, Sisi Que, Liang Wang, Kwame Awuah-Offei, Wei Yang, Hui Jiang

Kwame Awuah-Offei

The social responsibility of corporate mining has been challenged by a significant socio-political risk from local communities. These issues reduce shareholder value by increasing costs and decreasing the market perception of corporate social responsibility. Community engagement is the process of understanding the behavior and interests of a group of targeted mining communities through surveys and data analysis, with the purpose of incorporating mining community acceptance into the mining sustainability. While mining organizations have discussed community engagement to varying degrees, there are three main shortcomings in current studies, as concluded in the authors' previous research. This paper presents a framework to ...


The Status Of The Local Community In Mining Sustainable Development Beyond The Triple Bottom Line, Sisi Que, Liang Wang, Kwame Awuah-Offei, Yao Chen, Wei Yang Feb 2019

The Status Of The Local Community In Mining Sustainable Development Beyond The Triple Bottom Line, Sisi Que, Liang Wang, Kwame Awuah-Offei, Yao Chen, Wei Yang

Kwame Awuah-Offei

Mineral products provide essential fuels and raw materials for industrialization and our daily life, but their influences on other aspects of life need to be taken into consideration. While the whole world benefits from mining's contributions, most of the resulting detrimental impacts on the environment and society fall on the local communities. The participation of the local community is one solution to decrease the risks from community-related problems. Subsequently, the requirements of mining sustainable development can be met. A literature review was conducted on mining sustainability and stakeholder participation, and the shortcomings of existing research and difficulties of further ...


Recovery Of Phosphate Minerals From Plant Tailings Using Direct Froth Flotation, Ashraf Alsafasfeh, Lana Z. Alagha Feb 2019

Recovery Of Phosphate Minerals From Plant Tailings Using Direct Froth Flotation, Ashraf Alsafasfeh, Lana Z. Alagha

Lana Z. Alagha

Wastes produced from the phosphate industry presents many challenges due to the high economic and environmental impacts involved with their disposal. However, the relative scarcity of high-grade phosphate ores has driven researchers to recover and recycle these valuable wastes (secondary sources). The goal of this study was to investigate the possibility of upgrading the P2O5 content in tailings produced from a phosphorous production plant using direct froth flotation. Characterization assays, including X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray fluorescence (XRF), and mineral liberation analysis (MLA), were first conducted to identify the mineralogical and morphological characteristics of ...


Reference Data Set Of Volcanic Ash Physicochemical And Optical Properties, A. Vogel, S. Diplas, A. J. Durant, A. S. Azar, M. F. Sunding, William I. Rose, A. Sytchkova, C. Bonadonna, K. Krüger, A. Stohl Oct 2017

Reference Data Set Of Volcanic Ash Physicochemical And Optical Properties, A. Vogel, S. Diplas, A. J. Durant, A. S. Azar, M. F. Sunding, William I. Rose, A. Sytchkova, C. Bonadonna, K. Krüger, A. Stohl

William I. Rose

Uncertainty in the physicochemical and optical properties of volcanic ash particles creates errors in the detection and modeling of volcanic ash clouds and in quantification of their potential impacts. In this study, we provide a data set that describes the physicochemical and optical properties of a representative selection of volcanic ash samples from nine different volcanic eruptions covering a wide range of silica contents (50–80 wt % SiO2). We measured and calculated parameters describing the physical (size distribution, complex shape, and dense-rock equivalent mass density), chemical (bulk and surface composition), and optical (complex refractive index from ultraviolet to near-infrared wavelengths ...


The Causes Of Armature Surface Fracturing Within Helical Flux-Compression Generators, Jason Baird, Paul Nicholas Worsey Aug 2016

The Causes Of Armature Surface Fracturing Within Helical Flux-Compression Generators, Jason Baird, Paul Nicholas Worsey

Paul Nicholas Worsey

Aluminum and copper tubes filled with explosive were tested during this study of high strain rate effects, as an adjunct to helical flux-compression generator research at the University of Missouri-Rolla, directly affecting the understanding of flux cutoff and high strain-rate changes in generator armatures. Longitudinal cracks characteristically developed in the outer surface of armatures at a smaller expansion ratio than predicted. These cracks occurred within two diameters of the detonator end of the armature but did not extend when the tubing expanded under explosive pressurization. Such cracks appear to cause magnetic flux cutoff, and flux losses seriously affect energy conversion ...


Surface Fracturing Of Armatures Within Helical Flux-Compression Generators, Paul Nicholas Worsey, Jason Baird Aug 2016

Surface Fracturing Of Armatures Within Helical Flux-Compression Generators, Paul Nicholas Worsey, Jason Baird

Paul Nicholas Worsey

Tubes of aluminum and of copper filled with C-4 high-explosive were tested during this study of high strain rate effects within thin metallic structures performed as an adjunct to helical flux-compression generator research at the University of Missouri-Rolla. Focusing on the stresses within a relatively thin metallic structure when brisant explosives abutting the structure are detonated, this study directly affects the understanding of flux cutoff and high strain-rate resistivity changes in an expanding armature. The detonation wave is compressive, and the shock waves resulting from its transmission into a thin metallic structure cause both compressive and tensile regions, posing an ...


Rubble Pile Characterization Model, William P. Schonberg, Jason Baird, Paul Nicholas Worsey, Abdeldjelil Belarbi, Roger A. Laboube, Braden Lusk, R. Flanagan, H. Burleson, Robert S. Woodley, Warren Noll Aug 2016

Rubble Pile Characterization Model, William P. Schonberg, Jason Baird, Paul Nicholas Worsey, Abdeldjelil Belarbi, Roger A. Laboube, Braden Lusk, R. Flanagan, H. Burleson, Robert S. Woodley, Warren Noll

Paul Nicholas Worsey

Rubble piles created following the collapse of a building in a combat situation can significantly impact mission accomplishment, particularly in the area of movement and maneuver. Rubble characteristics must be known, for example, in order to predict the ability of a vehicle to override the collateral damage from weapon effects in urban areas. Two types of models are developed: a first-order model and a first-principles-based model. In both models, we assume complete rubblization of the building and develop a rubble profile model using the size and composition of the collapsed structure to predict the rubble volume. In both cases, this ...


Optical Diagnostics On Helical Flux Compression Generators, A. A. Neuber, J. C. Dickens, H. Krompholz, M. F. C. Schmidt, Jason Baird, Paul Nicholas Worsey, M. Kristiansen Aug 2016

Optical Diagnostics On Helical Flux Compression Generators, A. A. Neuber, J. C. Dickens, H. Krompholz, M. F. C. Schmidt, Jason Baird, Paul Nicholas Worsey, M. Kristiansen

Paul Nicholas Worsey

Explosively driven magnetic flux compression (MFC) has been object of research for more than three decades. Actual interest in the basic physical picture of flux compression has been heightened by a newly started Department of Defense (DoD) Multi-University Research Initiative. The emphasis is on helical flux compression generators comprising a hollow cylindrical metal liner filled with high explosives and at least one helical coil surrounding the liner. After the application of a seed current, magnetic flux is trapped and high current is generated by moving, i.e., expanding, the liner explosively along the winding of the helical coil. Several key ...


Method Of Stemming A Blast Hole, Paul Nicholas Worsey Aug 2016

Method Of Stemming A Blast Hole, Paul Nicholas Worsey

Paul Nicholas Worsey

A method of stemming a blast hole loaded with an explosive charge. The blast hole has side walls, an outwardly opening mouth and a central axis extending longitudinally of the blast hole. The method comprises inserting a conduit having a discharge end inwardly through the mouth of the blast hole and positioning the discharge end of the conduit within the blast hole generally adjacent the explosive charge. Particulate stemming material is forced under pressure through the conduit for exit from its discharge end into the blast hole toward the explosive charge thereby to pack stemming material in the blast hole ...


Mechanical Stemming Construction For Blast Holes And Method Of Use, Paul Nicholas Worsey Aug 2016

Mechanical Stemming Construction For Blast Holes And Method Of Use, Paul Nicholas Worsey

Paul Nicholas Worsey

A stemming construction for a blast hole loaded with an explosive charge, comprising a tapering wedge member dispersed in the blast hole outwardly of the explosive charge with its narrower end facing outwardly toward the mouth of the blast hole, and particulate stemming material in the blast hole outwardly of the wedge member. Detonation of the explosive drives the wedge member into the stemming material to wedge the stemming material against the walls of the blast hole. The wedge member is preferably cone-shaped and can be provided with a stabilizing rod to prevent it from tilting.


Effects Of Defects On Armatures Within Helical Flux-Compression Generators, Jason Baird, Paul Nicholas Worsey, Mark F. C. Schmidt Aug 2016

Effects Of Defects On Armatures Within Helical Flux-Compression Generators, Jason Baird, Paul Nicholas Worsey, Mark F. C. Schmidt

Paul Nicholas Worsey

Tubes of aluminum and copper filled with C-4 high-explosive were tested during this study of the effects of explosive flaws and voids, their sizes and locations, and of the effects of armature machining tolerances on the expansion characteristics of armatures within helical flux-compression generators. Flaws and voids were introduced into the explosive fill of 6061-T6 aluminum armatures during assembly. The defects were located along the major axis of the fill, midway between the major axis and the explosive/armature interface, and at the interface. The resulting effects on armature expansion were recorded by high-speed framing camera, intensified charge-coupled display (ICCD ...


An Analysis And Policy Implications Of Comfort Levels Of Diverse Constituents With Reported Units For Blast Vibrations And Limits: Closing The Communication Gap, Braden Lusk Aug 2016

An Analysis And Policy Implications Of Comfort Levels Of Diverse Constituents With Reported Units For Blast Vibrations And Limits: Closing The Communication Gap, Braden Lusk

Braden Lusk

"Differences exist between public perception of construction blasting and quarry blasting. In general, people are able to tolerate short term inconveniences much better than long term ones. Quarries and other long term mining operations utilizing blasting are coming under increasing public and legislative pressure in the United States. The question being posed for the blasting industry is, "Has our past haste in adopting complex scientific scales and units been detrimental to us?" In other words, are the most palatable things being reported? The goal of this dissertation is to determine whether current units create an atmosphere of discomfort among neighbors ...


Mining And Civilization, Fathi Habashi Jul 2015

Mining And Civilization, Fathi Habashi

Fathi Habashi

Ancient ruins or an ancient stone statue recalls the work of miners who brought the material from a quarry so that the sculptor can create a work of art. Carving of massive stone blocks and piercing tunnels in mountains are arts in which the same tools of mining are used and mining engineers are involved. Studying history of mining necessitates also the study of archaeology, art, architecture, and world history in general since it is the history of civilization. The pyramids of Egypt, the gold of Tut Ankh Amoun, the Coloseum in Rome, the Taj Mahal in Agra, and the ...


Tehran Subway Tunnel Settlement Analysis By Using Analytical, Experimental And Numerical Methods (Case Study: Station Of Imam Ali University), Innovative Research Publications Irp India, Javad Sadeghi, Hadi Hamidian Shourmasti Apr 2015

Tehran Subway Tunnel Settlement Analysis By Using Analytical, Experimental And Numerical Methods (Case Study: Station Of Imam Ali University), Innovative Research Publications Irp India, Javad Sadeghi, Hadi Hamidian Shourmasti

Innovative Research Publications IRP India

In The recent decades, the use of underground spaces including tunnels, railway, subway, cavern, underground spaces and others had great growth. Geological and geotechnical site conditions vary in different projects, requires different design, calculation and implementation methods also requires that the past experience and scientific and technical principles consistently applied. In this article we have tried to use the method of analytical, numerical and experimental investigation of the subway tunnel subsidence station of Imam Ali university


Understanding State Rulemaking Processes: Developing Fracking Rules In Colorado, New York, And Ohio, Sara Rinfret, Jeffrey Cook, Michelle Pautz Apr 2015

Understanding State Rulemaking Processes: Developing Fracking Rules In Colorado, New York, And Ohio, Sara Rinfret, Jeffrey Cook, Michelle Pautz

Michelle Pautz

Rulemaking is an integral component of environmental policy at both the federal and state level; however, rulemaking at the state level is understudied. With this research, we begin to fill that gap by focusing on rulemaking regarding the issue of hydraulic fracturing (fracking) in three states: Colorado, New York, and Ohio. This policy issue is well suited to begin exploring state-level rulemaking processes because the federal government has left fracking regulation to the states. Through semistructured interviews with a range of actors in the rulemaking process across these states, we establish a foundation from which future research in this area ...


Policy Memorandum: Recommendations For Reforming The 1872 Mining Act To Impose Royalties For The Extraction Of Hard Minerals, Rachele M. Hendricks-Sturrup Dec 2014

Policy Memorandum: Recommendations For Reforming The 1872 Mining Act To Impose Royalties For The Extraction Of Hard Minerals, Rachele M. Hendricks-Sturrup

Rachele M Hendricks-Sturrup

No abstract provided.


Avustralya'da Madencilik Ve Metal Kazanımı (Mining And Metal Extraction In Australia), Ahmet Deniz Bas Dec 2013

Avustralya'da Madencilik Ve Metal Kazanımı (Mining And Metal Extraction In Australia), Ahmet Deniz Bas

Ahmet Deniz Bas

No abstract provided.


Tree-Compatible Ground Covers For Reforestation And Erosion Control, Jennifer Franklin, James Burger, Victor Davis, Carl Zipper, Jeff Skousen, Chris Barton, Patrick Angel Jun 2009

Tree-Compatible Ground Covers For Reforestation And Erosion Control, Jennifer Franklin, James Burger, Victor Davis, Carl Zipper, Jeff Skousen, Chris Barton, Patrick Angel

Jennifer Franklin

Productive native forests create economic value for landowners, produce raw materials for wood-based products, and provide benefits such as watershed control, water quality protection, carbon storage, wildlife habitat, and native plant diversity. Owners of lands mined for coal in Appalachia are increasingly interested in assuring that productive forests are restored after mining.

Sediment control is essential to coal mine reclamation under the Surface Mining Control and Reclamation Act (SMCRA). Here, we describe how mining firms can achieve good tree survival and restore forest productivity by using tree-compatible ground covers, when necessary, to control erosion and meet ground cover standards.


Tree-Compatible Ground Covers For Reforestation And Erosion Control, James Burger, Victor Davis, Jennifer Franklin, Carl Zipper, Jeff Skousen, Chris Barton, Patrick Angel Jun 2009

Tree-Compatible Ground Covers For Reforestation And Erosion Control, James Burger, Victor Davis, Jennifer Franklin, Carl Zipper, Jeff Skousen, Chris Barton, Patrick Angel

Jennifer Franklin

Productive native forests create economic value for landowners, produce raw materials for wood-based products, and provide benefits such as watershed control, water quality protection, carbon storage, wildlife habitat, and native plant diversity. Owners of lands mined for coal in Appalachia are increasingly interested in assuring that productive forests are restored after mining.

Sediment control is essential to coal mine reclamation under the Surface Mining Control and Reclamation Act (SMCRA). Here, we describe how mining firms can achieve good tree survival and restore forest productivity by using tree-compatible ground covers, when necessary, to control erosion and meet ground cover standards.


Kinetics And Mechanisms Of Gold And Silver Dissolution In Cyanide Solution, Fathi Habashi Mar 1967

Kinetics And Mechanisms Of Gold And Silver Dissolution In Cyanide Solution, Fathi Habashi

Fathi Habashi

The dissolution of gold and silver in cyanide solution is an oxidation–reduction process in which cyanide ion forms a strong complex with Au+ or Ag+ ions and the reduction of oxygen on the surface of metal may take place partially to the hydrogen peroxide stage or completely to hydroxyl ion.