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Clay Mineralogy Of The Goathill North Rock Pile, Questa Mine, Taos County, NM: Origins And Indications Of In-Situ Weathering - Preprint 09-098
By K. Donahue
Clay minerals play an important role in the gravitational stability of man-made rock piles by affecting geotechnical and hydrological characteristics of the material. The Goathill North rock pile at t
Jan 1, 2009
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Preventive Maintenance Policy Supported By A Quality Control Chart And Kolmogorov-Smirnov Tests: Emet Colemanite Mineral Processing Plant, Turkey
By S. Yerel
In a mineral processing plant, the determination of a preventive maintenance schedule is one of the most important maintenance policies. In this study, to determine the preventive maintenance schedule
Jan 1, 2007
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High-resolution AUV-surveys of a sediment-covered massive sulfide occurrence in the Mediterranean Sea
By Isobel Yeo, Luca Cocchi, Sven Petersen, Nico Augustin, Sean Plunkett, Ingo Klaucke
Exploration for seafloor massive sulfides is currently mainly focused on investigation for active hydrothermal vent fields. However, most of the resource potential is thought to be related to inactive
Sep 1, 2014
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Stress, Geologic, And Support Design System (SGSSM) For Underground Mine Slopes
By J. C. Stankus
Accurate evaluation of stress and geological conditions is critical to ground control design in underground openings. For a slope entry, the problem is more difficult because a slope will transverse
Jan 1, 2011
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The Current State of Disc Cutter Design and Development Directions
By Joe Roby
Rolling disc cutters are the business end of hard rock and mixed face tunnel boring machines (TBMs). Since their first successful employment on a TBM over fifty years ago, disc cutter technology has c
Jan 1, 2008
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The Treatment Of Refractory Gold Ores Containing Carbonaceous Material And Sulfides
By W. J. Guay
Carbonaceous gold ores containing gold dispersed in sulfides are refractory to cyanidation because: (1 ) the carbonaceous materials adsorb gold during cyanidation; (2) a portion of the gold s so finel
Jan 1, 1981
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New Minnesota Mining Projects Remain On Track Despite Economy
Despite the current economic downturn that is now decimating iron ore production, Minnesota?s mining operators remain optimistic about the long-term prospects for the industry. Reflecting this optimis
Jan 1, 2009
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NATM Strategies In The U.S.?Lessons Learned From The Initial Support Design For The Caldecott 4th Bore
By Bhaskar B. Thapa
The design of the Caldecott 4th Bore, located along State Route 24 in Oakland, California, is based on the principles of the New Austrian Tunneling Method (NATM). Typical NATM initial support design p
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Lithologic and Structural Constraints on TBM Tunneling in New York City
By Charles Merguerian
In medium- to high-grade metamorphic terrains such as found in New York City(NYC), rock mass texture and mineralogy are important factors in predicting TBM penetration destiny. Integration of data fro
Jan 1, 2005
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Effect Of Microwave Treatment On The Flotation And Magnetic Separation Properties Of Pyrite, Chalcopyrite, Galena And Sphalerite
By N. M. Can
The effects of microwave treatment on the floatabilities and magnetic susceptibilities of some sulfide minerals, namely, pyrite, chalcopyrite, galena and sphalerite, were studied. Pure mineral samples
Jan 1, 2007
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Cable Shovel Dynamic Modeling For Determining Component Cycle Stress - Preprint 09-121
This paper presents a virtual prototype for the stress analysis of cable shovel components based on combination of flexible and rigid body approach. The general mechanical system of the cable shovel i
Jan 1, 2009
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High Performance Tunnel Boring Machine for Kárahnjúkar Headrace Tunnel, KAR-14—A Design and Case History
By Brian Khalighi, Massimo Franceschi, Giovanni Giacomin, Gianni Porta
Headrace Tunnels and parts of the Access Adit Tunnels of Kárahnjúkar Hydropower project, KAR-14, in Iceland will be excavated using three full-face Robbins Tunnel Boring Machines (TBM). TBM sizes rang
Jan 1, 2005
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Chambers Creek Interceptor Sewer Tunnel
By J. Jeffrey Wagner, Michael J. Bailey, Peter M. Douglass
The Chambers Creek Interceptor Sewer Tunnel project consisted of 2-1/2 miles (4 kilometres) of nominal 9-foot (2.7-metre) O.D. tunnel driven through predominantly glacially overridden soils. Mole-Coll
Jan 1, 1985
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Owner Procured Tunnel Boring Machines––A Discussion
By A. R. Biggart, A. Walters, G. J. E. Kramer
The Owner Procurement Process or OPP is a proven, viable alternative contract delivery method that is potentially applicable to many tunnel projects. Using the OPP, the owner specifies and procures ma
Jan 1, 2005
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Underground Caving Shield Change Outs At Us Steel’s Oak Grove Mine
By B. Weyerman
U. S. Steel's Oak Grove Mine experienced several top hinge failures on their caving shields. It was determined that all the caving shields needed to be replaced with new caving shields before mor
Jan 1, 2001
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Tunneling?Pipe Jacking of Large Diameter Pipes in O?Hare International Airport
By Mohammad Djavid
The one-pass tunneling pipe jacking method has often been the most schedule and cost efficient method for the pipe line installation. The main challenges in jacking pipes larger than 108 inches and fo
Jan 1, 2008
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English Sea Drives - A Success Story
By Joseph L. Margin
From a stubborn start to record setting performances in little over a year, that is the story of the English Running Tunnel Boring Machines. The program to transfer technical information on these high
Jan 1, 1991
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Low-Rank Coal Ash Characterization- Washability And Utilization Implications – Preprint 97-132
By P. D. Rao, D. E. Walsh
Chemical and physical properties of typical low-rank coal (LRC) ash are significantly different than bituminous coal ash. With the exception of extraneous ash, which is incorporated during mining or i
Feb 24, 1997
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Sao Paulo Metro Project?Control Of Settlements In Variable Soil Conditions Through EPB Pressure And Bicomponent Backfill Grout
By Lorenzo Pellegrini
The respect of EPB reference pressure during TBM advance and hyperbaric activities, the complete and effective filling of the annular gap between tunnel lining extrados and the excavation section and
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Glenbrook Nickel – Can New Caledonian Ore Save the Only US Nickel Producer?
By Kerry Spickelmier
The only nickel smelter and the only active nickel mine in the United States is Glenbrook Nickel Co., a joint venture (50% each) of Cominco Resources International Ltd. and Cominco Ltd. In 1989, with
Jan 1, 1993