Results 131 - 140 of 150

• Underground Mine Communications, Control and Monitoring
  1/1/1984 - Information Circulars
  Since 1969, the Bureau of Mines has sponsored numerous programs aimed at improving methods of underground communication. This manual brings together relevant data from all previous reports, studies, and other sources, and presents these data in such a w...
• Methane Emissions from U.S. Coal Mines in 1980
  1/1/1984 - Information Circulars
  A tabulation of methane emissions during 1980 for all United States coal mines with emissions greater than 0.1 MMcfd. The report also compares records of 1975 and 1980 and describes relationships between emissions in 1980 and the Bureau's coalbed gas co...
• Historical Summary of Coal Mine Explosions in the United States, 1959-81
  2/1/1983 - Information Circulars
  This Bureau of Mines publication presents investigators' reports of all major coal mine explosion disasters that occurred in the United States from 1959 through November 1981, along with a brief analysis of common factors in these disasters.
• Site-Specific and Regional Geologic Considerations for Coalbed Gas Drainage
  1/1/1982 - Information Circulars
  The objective of this paper is to provide information on specific geologic factors that should be considered prior to, during, and after the drilling of coalbed gas drainage boreholes. Many of the commonsense considerations that have been learned throug...
• Review of Horizontal Drilling Technology for Methane Drainage From U. S. Coalbeds
  1/1/1980 - Information Circulars
  Reviews underground methane drainage programs being conducted in various coalbeds. Equipment used in drainage programs such as drills, underground pipelines, and methane monitoring systems is described.
• Guide for the Construction of Driven-Rod Ground Beds
  1/1/1978 - Guides and manuals, Information Circulars
  This report describes a method for designing and constructing ground beds that has been developed under the sponsorship of the Bureau of Mines. Results of a bed constructed at the Bureau of Mines mine car roadway are presented.
• Underground Mine Communications (in Four Parts): 4. Section-to-Place Communications
  1/1/1977 - Information Circulars
  This Bureau of Mines report on underground mine communications addresses methods and equipment to meet the communication requirements of working sections and places of coal and metal-nonmetal mines. A review of the status of trapped miner detection is a...
• Design of Surface Mine Haulage Roads - a Manual
  1/1/1977 - Information Circulars
  An updated Bureau of Mines manual for the design of surface mine haulage roads. Covers such aspects as road alignment, construction materials, cross slope, drainage provisions and more.
• Methane Emission from U.S. Coal Mines in 1975, A Survey : A Supplement to Information Circulars 8558 and 8659
  1/1/1977 - Information Circulars
  This Bureau of Mines report tabulates methane emissions from U.S. Bituminous coal mines with daily emission rates of at least 100,000 cfd according to states, counties, and coalbeds. Most of the methane emitted is from mines in the Appalachian States. T...
• Underground Mine Communications (in Four Parts): 2. Paging Systems
  1/1/1977 - Information Circulars
  This Bureau of Mines report summarizes the research, development, and evaluation demonstrations conducted by the Bureau of Mines under the Coal Mine Health and Safety Act of 1969 to improve the means of notifying miners underground, who are away from th...