Results 11 - 20 of 21

• New Tricks for an Old Elephant: Revising Concepts of Coeur d'Alene Geology
  1/1/1998 - Peer reviewed journal articles
  The Coeur d'Alene Mining District of northern Idaho is remarkable for its number of large ore bodies and for the amount of its historical production of lead, zinc and silver. Since veins were first discovered in 1884, more than 127 Mt (140 million st) o...
• Pillar Mechanics of Coal Mine Bursts: A Control Strategy
  9/1/1995 - Conference papers
  In this study, data available for a range of U.S. bursts were considered in an effort to evaluate both common and distinctive features of coal mine bursts.
• Rib Stability: Practical Considerations to Optimize Rib Design
  1/1/1992 - Information Circulars
  Reviews the mechanics of rib failure and the relationship of coal mine geology and pillar constraint to rib instability. Strategies for choosing an effective method of rib support are considered and various rib support methods are discussed.
• Delineation of Fractures in Igneous Rock Masses Using Common Offset Radar Reflection
  1/1/1992 - Reports of Investigations
  As part of an investigation aimed at improving the health and safety and competitiveness of the mining industry, the U.S. Bureau of Mines evaluated the application of common offset radar profiling, using a 250-MHz ground-penetrating radar (GPR) system, ...
• Investigation of Methane Occurrence and Outbursts in the Cote Blanche Domal Salt Mine, Louisiana
  1/1/1988 - Reports of Investigations
  The Bureau of Mines conducted an investigation into the occurrence of outbursts of salt known to be responsible for explosions, fatalities, and damage in domal salt mines. The purpose of the investigation was to develop a basis for predicting these outb...
• Geologic Factors Influencing the Gas Content of Coalbeds in Southwestern Pennsylvania
  1/1/1988 - Reports of Investigations
  A Bureau of Mines geologic study of Pennsylvanian and Permian coalbeds in southwestern Pennsylvania was undertaken to determine the effects of coalbed geology and petrology on in situ coalbed gas contents.
• Assessment of Methane Hazards in an Anomalous Zone of a Gulf Coast Salt Dome
  1/1/1984 - Reports of Investigations
  This Bureau of Mines research study found gas emission rates from an advancing face, and flows and pressure of gas from an exploration drill hole were dependent upon the geology of salt encountered in a domal salt mine. This information suggests a great...
• 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...
• Methane Content and Geology of the Hartshorne Coalbed in Haskell and Le Flore Counties, Okla.
  1/1/1979 - Reports of Investigations
  The Bureau of Mines developed data on the methane content of the Hartshorne coalbed, Haskell and Le Flore Counties, Oklahoma. The methane content is calculated to be between 1.1 and 1.5 trillion cubic feet. Methane increases with depth, but the rate of ...
• Methods of Determining the Orientations of Bedrock Fracture Systems in Southwestern Pennsylvania and Northern West Virginia
  1/1/1977 - Reports of Investigations
  This Bureau of Mines report describes photo-lineaments obtained from stereoscopic examination of vertical aerial photographs and by the ronchi grating study of aerial photoindex sheets. The photo- lineaments are compared with the trends of oriented frac...