Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 59 for “"underground mine"”.
-
Air leakage in underground mine ventilation
Air leakage in underground mines is the most common cause of inefficient distribution of ventilating air. Depending upon various factors, more than half of the fresh air entering a mine short-circuits to the return airways before reaching the working faces. Consequently, large leakages create an …
-
Characterization of aerosols in an underground mine
… sampling was conducted in two phases of underground experiments. Scanning transmission electron microscopy and fast mobility particle sizers were used to determine the size distribution of agglomerates based on particle mobility and projected area diameter. Controlled zone sampling test …
-
Design of an ultimate underground mine layout
Includes bibliographical references.
-
Monitoring Underground Mine Displacement Using Photogrammetry and Laser Scanning
… of rock masses and their support systems in underground mine environments. Displacements underground are traditionally measured through point measurement devices, such as extensometers. These are generally restricted to measuring one dimension, may change behavior with installation, may …
-
Application of Background Oriented Schlieren (BOS) in Underground Mine Ventilation
… flows has significant implications for analyzing underground mine ventilation systems. Currently, the widely utilized traditional schlieren methods are impractical underground due to complex equipment and design requirements. Background oriented schlieren (BOS) provides a solution to this problem. …
-
Effect of applied pressures on the radon characteristics of an underground mine environment.
Massachusetts Institute of Technology. Dept. of Geology and Geophysics. Thesis. 1965. Ph.D.
-
Isotopic composition of dissolved inorganic carbon in underground mine discharges of the northern appalachian basin
This research examined the efficacy of using 13C of dissolved inorganic carbon (DIC) to infer geochemical and microbiological processes in underground coal mine discharges. Groundwater samples from mines in two different coal seams (the Pittsburgh and Upper Freeport) and three different …
-
Continuous DPM Monitoring in Underground Mine Environments: Demonstration of Potential Options in the Laboratory and Field
… including cardiovascular and pulmonary disease. Underground miners typically have the highest DPM exposures compared to other occupations. This is because many mines are characterized by confined work spaces and large diesel equipment fleets. Exposures can be a particularly high hazard in large …
-
Analysis of Seismic Signatures Generated from Controlled Methane and Coal Dust Explosions in an Underground Mine
… records during the time interval of the Sago Mine disaster in 2006 revealed a small amplitude signal possibly associated with an event in the mine. Although the epicenter of the signature was located in the vicinity where the explosion occurred, it could not be unequivocally attributed to the …
-
DESIGN, THERMAL SIMULATION AND ECONOMIC FEASIBILITY ANALYSIS OF A PLANT FACTORY HOUSED IN A UNDERGROUND MINE DRIFT
… to energy intensiveness. Producing vegetables in underground mine tunnels in the underground plant factory (UGPF) could reduce energy consumption of plant factories as it is not affected by surface weather. This study developed a numerical heat transfer model to simulate heat transfer through the …
-
Real-time diesel particulate matter monitoring in underground mine atmospheres, association with the standard method and related challenges
… 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 …
-
Development of a system that can quantify the level of heat strain experienced by underground mine workers in real-time
With global mineral demand increasing, mine operators are having to adapt by adding more mechanized equipment and excavating deeper underground. Mine workers are also being challenged to enhance their production output. This combination of ever-increasing depth, more heavily mechanized equipment …
-
The Assessment of Sonic Waves and Tracer Gases as Non-Destructive Testing (NDT) Methods for In-Situ Underground Mine Seals
Since the MINER Act of 2006, the minimum static load of in-situ underground mine seals has been increased from 20-psi to either 50-psi if monitoring is conducted or 120-psi if left unmonitored. These minimum strength requirements in seals must be designed, built, and maintained throughout the …
-
Development and Evaluation of a Permeation Plug Release Vessel (PPRV) for the Release of Perfluoromethylcyclohexane (PMCH) in Underground Mine Tracer Gas Studies
… hexafluoride (SF6) as a tracer gas for analyzing underground mine ventilation systems has been practiced for over 30 years. As a result, the methods used to release, sample, and analyze SF6 are well accepted. Although improvements are still being made to enhance the analysis of this tracer, the …
-
Development of an early warning system for predicting rock bursts and rock induced displacements in seismically active mining blocks at Mufulira underground mine (deeps section).
Mufulira Mine has been in operation since 1933. The Mine is situated on the Copperbelt region of Zambia. It is predominantly rich in copper mineralization. Due to increase in mine depth which currently stands at 1,557 m, the mine has been experiencing geomechanical challenges such as rock failures …
-
A detailed justification for the selection of a novel mine tracer gas and development of protocols for GC-ECD analysis of SPME sampling in static and turbulent conditions for assessment of underground mine ventilation systems
… a powerful means of assessing air quantity in underground mine ventilation circuits. The execution of a tracer gas style ventilation survey allows for the direct measurement of air quantity in locations where this information is otherwise unattainable. Such instances include inaccessible …
-
Development of a remote analysis method for underground ventilation systems using tracer gas and CFD
Following an unexpected event in an underground mine, it is important to know the state of the mine immediately to manage the situation effectively. Particularly when part or the whole mine is inaccessible, remotely and quickly ascertaining the ventilation status is one of the pieces of essential …
-
Apparent Stress Estimates of Seismic Events Associated with Underground Mining Operations in Sedimentary Rock Units: Implications for Improving Underground Roof Collapse Warning Systems
… analyze recordings of seismic events induced by underground mining operations at the Moonee Colliery, located in Australia, and at the Springfield Pike Limestone Quarry, located in the United States. The data were recorded underground in the vicinity of active mining operations and were initially …
-
Assessing Thermal Comfort in Deep Underground Mines
… maintaining relative body comfort in deep hot underground mines is of great significance. This is because productivity, health, safety and the bottom line of mine operations depend on it. Comfort studies have been extensively researched, especially in the built and meteorological fields …
-
The role of pulp chemistry in the flotation recovery of Nchanga underground copper ore
Nchanga concentrator treats vanous ores mined from around Chingola namely: Nchanga open pit, Luano open pit and Underground. About 30% of the copper ore (3% TCu) treated arises from the underground mine and the rest (70%) from the open pits (1.00 - 2.90% TCu). Cobalt ore is mined from the open pit …
Page 1 of 3