Assessment Of Potential Impacts To Subsurface Bodies Of Water Due To Underground Coal Mining, 2017 University of Kentucky
Assessment Of Potential Impacts To Subsurface Bodies Of Water Due To Underground Coal Mining, Gabriel Bode-Jimenez
Theses and Dissertations--Mining Engineering
Underground coal mining operations induce ground movements, which may impact overlying hydrogeologic systems. Potential impacts mainly include changes in the hydraulic conductivity of overlying strata, decreasing of the hydraulic head and changes in water flow. The present research quantifies potential hydrogeologic impacts caused by underground mining through modeling of pre- and post-mining hydrogeologic systems.
Three-dimensional conceptual hydrogeologic models were constructed with the Processing Modflow for Windows software package (PMWiN). The models are based on an actual case study, but were simplified in terms of geometry and material properties. Water flow was simulated under changing hydrogeologic properties. A number of scenarios ...
Calculation Of The Edge Effect Offset For High Extraction Coal Panels, 2017 University of Kentucky
Calculation Of The Edge Effect Offset For High Extraction Coal Panels, Joshua Hescock
Theses and Dissertations--Mining Engineering
The Surface Deformation Prediction System (SDPS) program has been developed as an engineering tool for the prediction of subsidence deformation indices through the implementation of an influence function. SDPS provides reliable predictions of mining induced surface displacements, strains, and tilt for varying surface topography. One of the key aspects in obtaining reliable ground deformation prediction is the determination of the edge effect offset. The value assigned to the edge effect corresponds to a virtual offsetting of boundary lines delineating the extracted panel to allow for roof cantilevering over the mined out area.
The objective of this thesis is to describe ...
Fundamental Improvement In The Tribocharging Separation Process For Upgrading Coal, 2017 University of Kentucky
Fundamental Improvement In The Tribocharging Separation Process For Upgrading Coal, Jinxiang Chen
Theses and Dissertations--Mining Engineering
Triboelectrostatic separation is a physical separation technique that is based on surface electronic property differences among minerals to achieve a separation. Minerals have different surface conductivities and electron affinities. They are charged differently in quantity and/or polarity after a tribocharging process. Particles with different surface charges move discretely under external electric field produce a separation. Electrostatic separation is a dry mineral processing method that does not require any water or chemical reagents. It can greatly simplify the processing circuit and reduce operating cost. Additionally, problems caused by water in conventional wet mineral processing such as water freezing, dewatering, water ...
Modeling Dynamic Community Acceptance Of Mining Using Agent-Based Modeling, 2017 Missouri University of Science and Technology
Modeling Dynamic Community Acceptance Of Mining Using Agent-Based Modeling, Mark Kofi Boateng
"This research attempts to provide fundamental understanding into the relationship between perceived sustainability of mineral projects and community acceptance. The main objective is to apply agent-based modeling (ABM) and discrete choice modeling to understand changes in community acceptance over time due to changes in community demographics and perceptions. This objective focuses on: 1) formulating agent utility functions for ABM, based on discrete choice theory; 2) applying ABM to account for the effect of information diffusion on community acceptance; and 3) explaining the relationship between initial conditions, topology, and rate of interactions, on one hand, and community acceptance on the other ...
Real-Time Diesel Particulate Matter Monitoring In Underground Mine Atmospheres, Association With The Standard Method And Related Challenges, 2017 Missouri University of Science and Technology
Real-Time Diesel Particulate Matter Monitoring In Underground Mine Atmospheres, Association With The Standard Method And Related Challenges, Muhammad Usman Khan
"Diesel-powered equipment is a significant component of underground mining operations. Miners' exposure to diesel exhaust is harmful. The standard Diesel Particulate Matter (DPM) monitoring method (NIOSH 5040 method) has limitations that preclude rapid DPM estimation and detailed understanding of DPM variations over time. However, real-time DPM monitors do not inherit these limitations. Biodiesel is often used as a substitute for regular petroleum-diesel because of its ability to emit less DPM. However, accuracy of available real-time DPM monitors has not been determined in mines using 70% to 99% (high-percent) biodiesel. The present research addresses this need by rigorous testing of a ...
Lhd Vibrations Analysis And Numerical Modeling During Operations, 2017 Missouri University of Science and Technology
Lhd Vibrations Analysis And Numerical Modeling During Operations, Kgosietsile Kolobe
"Load-haul-dump vehicles (LHDs) are extensively used as primary loaders in mining operations. LHDs have proven to be vigorous, extremely productive and reliable in mining applications. They have a wide range of tramming capacities that have enabled them to become an essential component in the hard rock mining industry.
Increased mining economic challenges and global competition means the mining industry has to maximize productivity by cutting down operating and capital costs. Also, improvements in safety standards have led to the demand for safer and efficient machines.
LHD operators are at a high risk of whole-body vibrations (WBVs) exposure leading to musculoskeletal ...
Mining Asteroids For Volatile Resources: An Experimental Demonstration Of Extraction And Recovery, 2017 Missouri University of Science and Technology
Mining Asteroids For Volatile Resources: An Experimental Demonstration Of Extraction And Recovery, Egboche Christopher Unobe
"Gaseous compounds trapped within carbonaceous asteroids may prove to be important targets for prospective space miners in the near-term. Volatile release is from hydrated, hydroxylated and carbonated phases present, making such bodies attractive as feedstock for the production of H2O, CO2 and simple organic compounds. A source of these species in orbit provides an opportunity to locally produce space-craft propellant and other life-support gases through the application of In-situ Resource Utilization (ISRU).
For this study, an experimental vacuum system was modified and used to test the technical validity of radiatively heating asteroid simulants to extract contained gaseous ...
Pillar Design For St. Peter Sandstone Formation, 2017 Missouri University of Science and Technology
Pillar Design For St. Peter Sandstone Formation, Francis Anohomah Arthur
"Silica sands produced primarily from St. Peter Sandstone are used for hydraulic fracturing in the petroleum industry, glassmaking, chemicals, ceramics, filtration and the foundry industry in the US. The recent high demand for silica sands for hydraulic fracturing has triggered increased production and commissioning of new silica sand mines to support natural gas production from shale and tight gas deposits in the US. Most mines use surface mining methods to extract St. Peter Sandstone. The room and pillar mining method has been successfully used for St. Peter Sandstone mining in a few US locations, however, no one has proposed a ...
Characterization And Numerical Simulation Of The Microstructural And Micromechanical Viscoelastic Behavior Of Oil Sands Using The Discrete Element Method, 2017 Missouri University of Science and Technology
Characterization And Numerical Simulation Of The Microstructural And Micromechanical Viscoelastic Behavior Of Oil Sands Using The Discrete Element Method, Eric Kofi Gbadam
"Oil sands are naturally geologic formations of predominantly quartz sand grains whose void spaces are filled with bitumen, water, and dissolved gases. The electric rope shovel is the primary equipment used for excavating the Athabasca oil sand formations. The equipment's static and dynamic loads are transferred to the formation during excavation and propel. These loads cause ground instability leading to sinkage or rutting, crawler wear, and fracture failures. These problems result in unplanned downtimes, production losses, and high maintenance costs. In order to address these problems, there is a need to develop valid models that capture the behavior and ...
The Influence Of Caprock On Blast Fragmentation Distribution, 2017 Missouri University of Science and Technology
The Influence Of Caprock On Blast Fragmentation Distribution, Matthew Kurtis Coy
"This dissertation describes the development of a small-scale model of a caprock-laden quarry blast and discusses the results from that testing. The purpose of this testing was to provide insight into the reasons for poor caprock breakage during blasting.
Small-scale test blocks were poured using a weak mortar mix to represent a limestone formation at a small scale. A cold joint was created in the upper portion of the test specimens to represent the bedding plane that separates caprock and substrate layers in a caprock-laden limestone bench. The scale-model test blocks were blasted using detonating cord. The primary configuration for ...
Recovery Of Phosphate Minerals From Plant Tailings Using Direct Froth Flotation Process, 2017 Missouri University of Science and Technology
Recovery Of Phosphate Minerals From Plant Tailings Using Direct Froth Flotation Process, Ashraf Alsafasfeh
"The wastes produced from phosphate industry presents many challenges due to the economic and environmental impacts of their disposal. In the meantime, scarcity of high-grade phosphate ores persuades researchers to find novel methods of upgrading these wastes (secondary sources) and recycling them in the production plant circuit. The goal of this study is to investigate the potential to upgrade the phosphorus content in the tailing produced from a phosphorous production plant using direct froth flotation process. Characterization studies such as X-ray diffraction (XRD), scanning electron microscopy (SEM), and mineral liberation analysis (MLA) were first conducted to identify the mineralogical and ...
Detection Of Mine Roof Failure Using Inexpensive Lidar Technology, 2017 Missouri University of Science and Technology
Detection Of Mine Roof Failure Using Inexpensive Lidar Technology, Ali Abdullah M. Alzahrani
"Slope, Roof, and mine wall stability problems are some of the main reasons for deaths at U.S. surface or underground mining. The safety instruments were not enough to prevent that failure or even predict it before it occurs. However, the cost of such a tool that can be helpful in detecting roof failures is very high and not reachable in most instances.
The present study investigates the feasibility of using the M16 Leddar Evaluation Kit to detect the roof failure in mines. The M16 Leddar Evaluation kit cost is between 300$-800$, so it is the reachable price if ...
The Andacollo's Mining Community: Ethnographic Work-Based Approach To Corporate Social Responsibility Policies And Practices, Ubirata De Oliveira
Walden Dissertations and Doctoral Studies
This ethnographic study was designed to explore the phenomenon of corporate social responsibility (CSR) in the mining industry. The research addressed the impacts of a problematic, systemic, and ethnocentric (top-down) CSR approach driven by a transnational mining company, and proposed a novel cultural relativist (bottom-up) CSR approach looking at the social needs of the community. Solving the problem stemming from the ethnocentric approach is important for both the mining company and the community affected by the CSR program, as it will alter dynamics between actors and mitigate social conflicts. The purpose of this study was to investigate factors that improve ...
Fiber Bragg Grating Sensors For Mainstream Industrial Processes, 2017 Edith Cowan University
Fiber Bragg Grating Sensors For Mainstream Industrial Processes, Gary Allwood, Graham Wild, Steven Hinkley
ECU Publications Post 2013
This paper reviews fiber Bragg grating sensing technology with respect to its use in mainstream industrial process applications. A review of the various types of sensors that have been developed for industries such as power generation, water treatment and services, mining, and the oil and gas sector has been performed. A market overview is reported as well as a discussion of some of the factors limiting their penetration into these markets. Furthermore, the author’s make recommendations for future work that would potentially provide significant opportunity for the advancement of fiber Bragg grating sensor networks in these mainstream industries.
A Novel Method For Sensorless Speed Detection Of Brushed Dc Motors, 2016 University of Valladolid, Spain
A Novel Method For Sensorless Speed Detection Of Brushed Dc Motors, Ernesto Vazquez-Sanchez, Joseph Sottile, Jaime Gomez-Gil
Mining Engineering Faculty Publications
Many motor applications require accurate speed measurement. For brushed dc motors, speed can be measured with conventional observers or sensorless observers. Sensorless observers have the advantage of not requiring any external devices to be attached to the motor. Instead, voltage and/or current are measured and used to estimate the speed. The sensorless observers are usually divided into two groups: those based on the dynamic model, and those based on the ripple component. This paper proposes a method that measures the current of brushed dc motors and analyses the position of its spectral components. From these spectral components, the method ...
Ignimbrites To Batholiths, 2016 Michigan Technological University
Ignimbrites To Batholiths, Chad Deering
Ignimbrites sample large magma reservoirs in the Earth’s upper crust, sometimes digging deep enough to link the volcanic realm with the plutonic world. Integrating textural, petrological, geochemical, and geochronological information on such deposits with geophysical signals suggest incremental growth and evolution of subvolcanic magma bodies that are dominated by high crystallinity mush zones, but sometimes remain sufficiently liquid to erupt. The eruptible upper portions are either extracted melt from the mush and constitute only a small volumetric fraction of the vertically extensive mushy batholithic magma body. The high-flux, ignimbrite flare-up phases are typically preceded by waxing magmatism that prime ...
Eveleth, Minnesota: A Portrait Of My Home Town, 2016 University of Arkansas, Fayetteville
Eveleth, Minnesota: A Portrait Of My Home Town, Judith I. Luna
Theses and Dissertations
This 30-minute documentary film provides snapshots of the small northeastern iron mining town of Eveleth, Minnesota, on the Mesabi Iron Range. It uses a two-pronged approach: 1) a first-person return to the town by the filmmaker almost 50 years after graduating from high school to see how the town may have changed, 2) a look at some historical and cultural factors which made the town what it was when the filmmaker was growing up and what continues to animate the town in the face of iron mining’s decline and rebirth. The latter include the immigrant experience and influence as ...
Haul Truck Tires Recycling, 2016 University of Arkansas, Fayetteville
Haul Truck Tires Recycling, Omkar Bhave
Chemical Engineering Undergraduate Honors Theses
The disposal of large Off-the-Road (OTR) tires is an increasingly important concern. These tires can weigh up to 8,450 pounds with an overall diameter and width of approximately 140.7 inches and 45.1 inches respectively. OTR tires are used for mining vehicles such as haul trucks, wheel loaders, backhoes, graders, and trenchers. These new tires cost between $38,000 and $50,000 each, depending on multiple factors including oil prices and the cyclical nature of the industry. Haul trucks contain six tires per vehicle, and mines replace these tires around every 9-12 months. Statistics regarding discarded ...
Explosion Testing Of A Polycarbonate Safe Haven Wall, 2016 Missouri University of Science and Technology
Explosion Testing Of A Polycarbonate Safe Haven Wall, Kyle A. Perry, Rex A. Meyr
Mining and Nuclear Engineering Faculty Research & Creative Works
The MINER Act of 2006 was enacted by MSHA following the major mining accidents and required every underground coal mine to install refuge areas to help prevent future fatalities of trapped miners in the event of a disaster where the miners cannot escape. A polycarbonate safe haven wall for use in underground coal mines as component of a complete system was designed and modeled using finite element modeling in ANSYS Explicit Dynamics to withstand the MSHA required 15 psi (103.4 kPa) blast loading spanning 200 milliseconds. The successful design was constructed at a uniform height in both half-width scale ...
Diversity And Impacts Of Mining On The Non-Volant Small Mammal Communities Of Two Vegetation Types In The Brazilian Amazon, 2016 Universidade do Estado do Rio de Janeiro
Diversity And Impacts Of Mining On The Non-Volant Small Mammal Communities Of Two Vegetation Types In The Brazilian Amazon, Natália Carneiro Ardente, Átilla Colombo Ferreguetti, Donald Gettinger, Pricila Leal, Ana Cristina Mendes-Oliveira, Fernanda Martins-Hatano, Helena Godoy Bergallo
Faculty Publications from the Harold W. Manter Laboratory of Parasitology
The CarajaÂs National Forest contains some of the largest iron ore deposits in the world. The majority of the minerals are found below a plant community known as Savana MetaloÂ fila, or ªCangaº, which represents only 3% of the landscape within the CarajaÂs National Forest (CNF). The aim of our study was to understand the diversity of community of non-volant small mammals in the two predominant vegetation types: Ombrophilous Forest and Canga, and to examine how mining impacts these communities. Sampling was conducted from January 2010 to August 2011 in 11 sampling sites divided by the total area of Canga ...