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  • SME
    Desulphurisation Of Fine Graphite Powder By HGMS

    By Y. Wang, K. S. E. Forssberg, A. Johansson, X. Lu

    This paper presents the desulphurisation of a fine graphite powder below 80 µm by high gradient magnetic separation. The removal of pyrite (FeS2) and pyrrhotite (Fe1-xS) from the fine graphite powder

    Jan 1, 2002

  • SME
    A Disappointing Year for Industrial Minerals Production

    A glance at the accompanying table reveals that for the first time in many years the industrial minerals field did not post significant gains in production. Gypsum, cement, sand and gravel, and cru

    Jan 5, 1980

  • 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
    Empire Pebble Crushing Circuit, Going Back To Basics, Is The Crusher Crushing?

    By H. Walqui

    This paper describes operating gains resulting from standardizing operating and maintenance practices to improve the performance of the pebble crushing circuit at he Empire Concentrator. Past efforts

    Feb 27, 2013

  • SME
    Economic Conditions Help Minnesota’s Iron Ore Mining

    By William R. Yernberg

    What a difference a year makes. One year ago, the iron mining industry and the steelmaking industry in the United States were in trouble. Many companies were in bankruptcy, and talk of plant and mine

    Jan 1, 2004

  • SME
    Mechanisms Involved In Reactive Flotation Of Dolomite

    By A. El-Midany

    Dolomite impurities are increasing in the currently mined phosphate deposits in Florida. Several research efforts have been conducted in various laboratories around the globe to find methods to econom

    Jan 1, 2009

  • SME
    Operational Practices To Reduce Copper And Other Metals Loading Onto Activated Carbon In Heap Leach CIC Circuits - Introduction - Preprint 09-109

    By B. Cousins

    Copper, nickel, zinc and other ?penalty? metals are found with gold together in nature, and have a similar chemical affinity for cyanide used in leaching operations4. As a result, solutions that come

    Jan 1, 2009

  • SME
    Software For Hydrologic Monitoring Of In Situ Leaching Operations

    By Peter K. Mathison

    The U. S. Department of Interior, Bureau of Mines (Bureau) is developing a hydrologic monitoring system for in situ leaching operations. A working prototype of this system was installed and tested at

    Jan 1, 1992

  • SME
    Planning of Mining Resources Exploitation in European Countries

    By M. Fornaro, E. Lovera, I. Sacerdote

    "The analysis of the mining laws of the different European States reveals big diversities and, often, remarkable complications. This is due, firstly, to the history and culture of different States and

    Jan 1, 2005

  • SME
    Onsite Assembly And HARD Rock Tunneling At The Jinping-II Hydropower Station Power Tunnel Project

    By Stephen M. Smading

    Unique onsite assembly of a 12.43 m Main Beam TBM and back-up system was completed on September 18, 2008 in the remote mountains of the Sichuan province of China. The equipment was assembled onsite, w

  • SME
    Value Creation Through Strategic Mine Planning and Cutoff Grade Optimization

    The OptiPit® software program is developed based on expertise gained at the Colorado School of Mines (CSM) using Mixed Integer Linear Programming (MILP) techniques. This program has been developed to

    Jan 1, 2007

  • SME
    New look at underground coal mine safety

    By E. M. Spokes

    Starting in 1980, a committee of the National Research Council studied the question of why some underground coal mines are safer than others and what could be done to improve the ones with poorer perf

    Jan 1, 1987

  • SME
    Wireless Access To Live Data From Mining Operations - Anywhere & Anytime

    By R. Heersink, C. H. Wells

    Innovations in communications and real-time information systems are providing industry opportunities to improve profitability. Real-time operating data is collected from equipment across a site or ev

    Jan 1, 2002

  • SME
    Control Of Iron In Copper Electrolyte Streams With A New Monophosphonic/Sulphonic Acid Resin (SME Annual Meeting Feb. 28-Mar. 1, Salt Lake City, Utah)

    By M. J. Gula, S. S. Xue, E. P. Horwitz, J. T. Harvey

    A study has been conducted to control iron in copper electrolyte streams using Eichrom Industries’s new Monophosphonic /sulphonic acid resin. The resin strongly and selectively extracts ferric ion ov

    Jan 1, 2000

  • SME
    Low temperature hydrothermal activity in Ultraslow Spreading Ridges

    By Huaiyang Zhou

    "Hydrothermal systems are a major component of the processes that shape the composition and structure of the ocean crust, providing a major pathway for the exchange of heat and elements between the Ea

    Sep 1, 2014

  • SME
    A Standard Column Weathering Test To Estimate Coal Overburden Leachate Quality - Introduction - Preprint 09-086

    By E. F. Perry

    Simulated weathering tests are used to estimate leachate quality of rocks containing varying concentrations of pyrite and carbonates at mines. This study reports the inter-laboratory results from the

    Jan 1, 2009

  • SME
    The introduction of UK rock bolting technology into coal mines around the world

    By G. Daws, N. Woodward, A. Oxley

    Many mines around the world have been seeking ways to achieve sustainable developments and reduce operating costs. Rockbolting is a technology that needs to be considered as it provides a means of red

    Jan 1, 2011

  • SME
    Modeling helps tame surges in rapidly filling storage tunnels

    By Peter Klaver

    Deep tunnels have been used for decades for the temporary storage of large volumes of urban runoff, both storm water and combined sewer overflow (CSO). Tunnels are attractive because they reduce surfa

    Jan 3, 2010

  • SME
    Performance Characteristics For Welded Wire Screen Used For Surface Control In Underground Coal Mines - Preprint 09-104

    By D. R. Dolinar

    The fall of small pieces of rock between roof bolts causes over 80 pct of the ground fall injuries in underground coal mines. Roof screen, if installed on the bolting cycle, can significantly reduce

    Jan 1, 2009

  • SME
    Geotechnical Investigation for Design of Largest USA Highway Tunnel Cross Section in Challenging Geotechnical Conditions ? Introduction

    By Julian Prada

    Tunneling requirements are presenting designers with greater challenges. The design and construction of the 2000-ft long unidirectional twin highway tunnels for the approach to one of two bridges of t

    Jan 1, 2008