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  • SME
    Roadheader Performance On The Caldecott 4th Bore Tunnel

    By 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

  • SME
    Sustainability and resource efficiency in potash and rock salt mining

    By 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

  • SME
    A Robust Water-Balance Method For Sizing Heap Leach Solution Ponds

    By 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

  • SME
    New Chances From Old Shafts - Risk Management In Abandoned Mine Sites In Germany ? Introduction

    By 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

  • SME
    The Dissolution Of Copper Sulfides Under Reducing Conditions

    By 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

  • SME
    RockVision3D™ Applications to Delineate Hazardous Geologic and Stress Conditions in Coal Mines—Case Histories

    By 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

  • SME
    Amax Coal’s Delta Mine – Medium-Sized, High-Sulfur Operation Survives Markets Challenges

    By 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

  • SME
    The Alpha Foundation; Improving mine safety through research

    By 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

  • SME
    Life-Of-Mine Process Simulation From Drill Holes To Net Present Value

    By 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

  • SME
    Recovery And Utilization Of Bottom Ash Magnetics For Coal Cleaning Medium - Preprint 09-002

    By 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

  • SME
    A Methodological Model To Assist On The Optimization And Risk Management Of Mining Investment Decisions

    By 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

  • SME
    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

  • SME
    Bi-Product Utilization, Lignins, Lignosulfonates And Their Many Applications

    By 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

  • SME
    Coal Desulfurization With Sodium Hypochlorite

    By 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

  • SME
    Mini Symposium ? Coal Slurry Fuels ? Coal/Water Dispersions - Characterization Of Coal/Water Dispersions ? Introduction

    By 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

  • SME
    Sphericity Of Apatite Particles Determined By Gas Permeability Through Packed Beds

    By 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

  • SME
    Metropolitan Boston Transit Authority Red Line Project Harvard Square To Porter Square Tunnels Cambridge, Massachusetts

    By 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

  • SME
    Comprehensive Pressure Quantity Survey For Investigating The Effects Of Booster Fans In A Trona Mine

    By 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

  • SME
    Gold processing scrutinized at Las Vegas SME meeting

    By 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

  • SME
    Turkey operates its first overland conveyor with horizontal curves

    By 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