Search Documents
Search Again
Search Again
Refine Search
Refine Search
- Relevance
- Most Recent
- Alphabetically
Sort by
- Relevance
- Most Recent
- Alphabetically
-
Roadheader Performance On The Caldecott 4th Bore TunnelBy D. Kwietnewski
The 4th bore of the Caldecott Tunnel is a 50-ft horseshoe shaped highway tunnel located in the hills east of Oakland, California. Tunnel excavation was mostly completed using one of the world?s large
Feb 27, 2013
-
Sustainability and resource efficiency in potash and rock salt miningBy F. X. Spachtholz
"Raw materials industry is crucial for national economy. German mining companies are known for their high degree of resource efficiency based on modern technology and know how. K+S is one of the world
Jan 1, 2011
-
A Robust Water-Balance Method For Sizing Heap Leach Solution PondsBy J. R. Kunkel, V. Lishnevsky
At mine sites, the operational and required storage volumes of solution and water storage ponds and reservoirs are usually calculated based upon a water-balance approach. Many climatological variables
Jan 1, 2002
-
New Chances From Old Shafts - Risk Management In Abandoned Mine Sites In Germany ? IntroductionBy J. Kretschmann
Around the world, mining has been done for thousands of years for the benefit of humankind. The winning process in mining operations ends with the depletion of the deposit or its closure if the operat
Jan 1, 2012
-
The Dissolution Of Copper Sulfides Under Reducing ConditionsBy C. A. Young, R. G. Robins, E. J. Dahlgren
The formation of copper thio-complexes in sulfide solutions has been recognized for many years and the measured solubilities of certain copper sulfide minerals attributed to these complexes. Attempts
Jan 1, 2001
-
RockVision3D™ Applications to Delineate Hazardous Geologic and Stress Conditions in Coal Mines—Case HistoriesBy K. Y. Haramy, K. Hanna
Early identification of adverse geologic conditions and high stress concentrations during the high-speed extraction of coal using modern mechanized longwall systems is a major challenge facing the min
Jan 1, 1999
-
Amax Coal’s Delta Mine – Medium-Sized, High-Sulfur Operation Survives Markets ChallengesBy Steve Kral
Amax Coal Industries Inc.'s Delta Mine is a medium-sized. high-sulfur coal producer that has lived up to the challenges posed by nearly six decades of a highly competitive domestic coal market.
Jan 1, 1993
-
The Alpha Foundation; Improving mine safety through researchBy Michael Karmis
"In December 2011, the U.S. Attorney’s Office for the Southern District of West Virginia, the U.S. Department of Justice, Alpha Natural Resources (ANR) and Alpha Appalachia Holdings entered into a non
Jan 1, 2014
-
Life-Of-Mine Process Simulation From Drill Holes To Net Present ValueBy J. T. Bartlett
Life-of-mine process simulation is an interdisciplinary effort and a useful means of thoroughly evaluating mining and minerals projects. Communication between geologists, mine planners, miners, metall
Feb 27, 2013
-
Recovery And Utilization Of Bottom Ash Magnetics For Coal Cleaning Medium - Preprint 09-002By R. Q. Honaker
Dense medium processes are used to clean over 50% of the coal that is fed into preparation plant facilities worldwide. The dense medium is formed using ultrafine magnetite which is recovered after the
Jan 1, 2009
-
A Methodological Model To Assist On The Optimization And Risk Management Of Mining Investment DecisionsBy J. A. Botín
Identifying, quantifying and minimizing technical risks associated to investment decisions is a key challenge for the minerals industry decision takers and investors. However, risk analysis in most b
Jan 1, 2011
-
Numerical Modeling Of Seepage Into Underground Openings (4a0cd9e7-1f24-450c-9408-9ee2fab94e55)By S. Finsterle, R. C. Trautz
We performed numerical modeling studies to investigate water seepage into underground openings excavated in unsaturated fractured rock. Water seepage is a key factor affecting the performance of a nu
Jan 1, 2000
-
Bi-Product Utilization, Lignins, Lignosulfonates And Their Many ApplicationsBy S. L. Lebo, J. D. Gargulak
Lignin, the second most abundant natural polymer and bi-product of the pulp and paper industry, has been commercially available in a number of forms since 1940. This growing industry is fueled by dem
Jan 1, 2002
-
Coal Desulfurization With Sodium HypochloriteBy Eung Ha Cho, Wendi Li
Wet desulfurization of Pittsburgh No. 8 coal and Illinois No. 6 coal were conducted with sodium hypochlorite in the laboratory. Pittsburgh No. 8 coal was leached by hypochlorite at high pHs in one ste
Jan 1, 2005
-
Mini Symposium ? Coal Slurry Fuels ? Coal/Water Dispersions - Characterization Of Coal/Water Dispersions ? IntroductionBy E. Z. Casassa
There has been a recent revival of interest in concentrated coal/water slurries as a substi¬tute for fuel oil or for coal/oil mixtures, particularly in electric power generation. The idea is not a new
Jan 1, 1983
-
Sphericity Of Apatite Particles Determined By Gas Permeability Through Packed BedsBy T. C. Souza Pinto
Because shape is an assessment of the three-dimensional form of a particle, it may be described in terms of sphericity (?), which is a measure of how closely a particle approaches a spherical configur
Jan 1, 2009
-
Metropolitan Boston Transit Authority Red Line Project Harvard Square To Porter Square Tunnels Cambridge, MassachusettsBy Daniel F. Meyer
INTRODUCTION The Metropolitan Boston Transit Authority (MIA) Red Line has served greater Boston commuter needs from its Harvard Square terminus since its opening in 1912. Since then, the population
Jan 1, 1983
-
Comprehensive Pressure Quantity Survey For Investigating The Effects Of Booster Fans In A Trona MineBy A. Habibi
The ventilation survey was conducted in an underground longwall trona mine. The mine is relatively shallow and categorized as a gassy mine. The ventilation system consists of nine shafts (three intake
Feb 27, 2013
-
Gold processing scrutinized at Las Vegas SME meetingBy Lane White
The 1989 Annual Meeting and Exhibit of SME in Las Vegas, NV, February 27 - March 2, 1989, was the largest ever, drawing more than 4000 regis¬trants and 240 exhibit booths. Technical sessions included
Jan 1, 1989
-
Turkey operates its first overland conveyor with horizontal curvesBy M. Sagheer
An 8.5-km (5-mile) conveyor has gone into operation in western Turkey to eco¬nomically transport crushed lignite from the mine area to a power plant. This conveyor has replaced trucks as the principal
Jan 1, 1989