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OFR-74-75 Economic Engineering Analysis Of U.S. Surface Coal Mines And Effective Land Reclamation ? Executive Summary
Fossil fuel consumption in the United States increased markedly over recent years, and future demands expect to be even greater. Coal, this Nation's most plentiful natural fossil fuel, will play
Jan 1, 1975
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Steel-Fiber Reinforced Self-Compacting Concrete on the San Vicente Aqueduct Tunnel
By C. D. Hebert, M. R. King
The 56,000' (17 km) long San Vicente Aqueduct Pipeline tunnel is being constructed using precast concrete rings to act as preliminary ground support through two sections of the bored tunnel with
Jan 1, 2007
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Factors in the Variability of Measured Surface Settlements over EPB Driven Tunnels in Soft Clay
By S. Boone, J. N. Shirlaw
INTRODUCTION Soft, near normally consolidated clays generally provide ideal conditions for tunneling using Earth Pressure Balance (EPB) shields. It is easy to turn the clay into a low permeability,
Jan 1, 2007
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Rockworks Earthapps - A Free Collection Of 74 Programs Forcreating Geologically-Related Diagrams Within Google Earth
By J. Reed
The RockWorks EarthApps represent a free collection of 74 geology-related programs that read data from a built-in datasheet and create diagrams within Google Earth. EarthApps also includes programs th
Feb 27, 2013
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A New Series Of Bureau Of Mines Reports Announced
A new series of reports called ?Mineral Perspectives" (MP's) has been initiated by the Bureau of Mines with the publication of MP-1 titled, "Far East and South Asia" by K.P. Wang and the staff of
Jan 1, 1977
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OFR-135-77 Multilift Longwall Mining Methods For Thick Coal Design And Feasibility
By John Wilson
This report describes the performance of Phase I of a project to design, analyze, and demonstrate a multilift longwall mining method applicable to mining coal seams twelve (12) feet or more in thickne
Jan 1, 1976
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Mineral Indicators - Aluminum: (34aea1b0-8707-476d-a608-b15875f18c04)
During the period January 1, 1977 through July 31, 1977, 5 percent (264,000 tons) of U.S. capacity was closed due to power curtailments in the Pacific Northwest because of the shortage of water. Durin
Jan 1, 1977
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Characterization And Upgrading Of Fine Sillimanite Ore Using Wide-Angle Dense-Medium Cycloning
By A. A. Sadegh
A laboratory investigation was carried out on the characterization and beneficiation of sillimanite ore. Petrographic analysis indicated that the ore consisted of massive elongated sillimanite grains
Jan 1, 2007
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OFR-108-77 The Effect Of Organizational Climate And Policy On Coal Mine Safety
By Mark S. Sanders
The present study was designed to explore the contribution of organizational climate and management practices to the injury experience in underground coal mines. A cross-lagged panel design was used i
Jan 1, 1976
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RI 4465 The "Carbon-Oxygen Complex" As A Possible Initiator Of Explosions And Formation Of Carbon Monoxide In Compressed-Air Systems
By H. W. Busch
In the course of examinations by representatives of the Bureau of Mines of several compressed-air systems in which explosions had occurred, samples were obtained of the carbon deposits that are formed
Jan 1, 1949
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Industrial Minerals - Resources and Utilization of North Carolina Pyrophyllite
By Jasper L. Stuckey
PYROPHYLLITE, first identified as soapstone,' later as agalmatolite,2 and finally as pyrophyl-lite, has been known to occur in North Carolina for more than 130 years and has been produced intermi
Jan 1, 1959
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Biogeochemical Prospecting for Zinc and Lead in the Te Aroha Region of New Zealand
The uptake of zinc, lead, and copper by the flora of the Tui Base Mine area near Te Aroha is described.Vegetation and soil samples were taken from two traverses across the Raukaka Lode. Results. after
Jan 1, 1969
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RI 3905 Mica and Beryl Examination and Exploration in Cleburne, Randolph, Clay, Coosa, Chilton, Tallapoosa, and Lee Counties, Ala.
By Staff
"INTRODUCTION Sheet mica is one of the most important minerals in modern industry. It is used in many kinds of electrical devices, and up to the present time no satisfactory substitute for it has been
Aug 1, 1946
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OFR-54-81 Improving Surface Coal Refuse Disposal Site Inspections
By R. A. Meister
The study on improving surface coat refuse disposal site inspections included surface inspections of 15 refuse disposal sites. Monthly aerial photos were taken of the sites and computer methods were u
Jan 1, 1980
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OFR-27-89 Proceedings Of The 23rd International Conference Of Safety In Mines Research Institutes ? Session I ? Mines Fires ? Review Paper: Mine Fires
By A. F. Roberts
The subject of mine fires is a very wide one. To give reasonable coherency, the paper concentrates on the behaviour of fires in the ventilated airways of mines; spontaneous combustions are not conside
Jan 1, 1989
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NATM Through Clean Sands—The Michigan Street Experience
By Mohamed A. Younis, Paul J. Headland, Paul H. Madsen, Vojtech Gall
INTRODUCTION A 100 ft long, 20 ft high and 18 ft wide NATM tunnel was excavated through grouted clean sands beneath a busy city street, including a variety of existing utility lines. The new tunnel
Jan 1, 2007
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OFR-121-77 Longwall Ignition Suppression
By Ronald D. Rothchild
This report describes the results of a study of longwall ignition hazards and specific suppression systems to minimize each of the major hazards. The major ignition hazards were identified by conducti
Jan 1, 1976
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An Efficient Method of Stirring Melt With a Modulated Traveling Magnetic Field
By Xiaodong Wang
A liquid metal flow generated by a magnetic field whose traveling direction is periodically reversed, the Reversed Traveling Magnetic Field (R-TMF) is studied. The modulation frequency ranges from 0 t
Jan 1, 2009
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The National Economy In The Third Quarter
By Keith L. Harris
The U.S. economy continued to grow moderately in the third quarter, but at a slightly higher rate than in the previous quarter. According to the Department of Commerce's preliminary estimate, rea
Jan 1, 1985
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Innovative Mining Systems For Low-Cost Production In Very Thick Alluvial Deposits
By G. Goellner
The thick alluvial sand and gravel deposits along the base of the San Gabriel mountain range in Southern California area have been mined for construction aggregates for over 100 years. Encroachment of
Jan 1, 2004