Results 21 - 30 of 33

• Drill Rig Incident
  2/1/2005 - Information Circulars
  This Instructor's Copy contains most of the materials trainers will need in order to use the Drill Rig Incident exercise.
• Drill Monitor With Strata Strength Classification in Near-Real Time
  7/1/2002 - Reports of Investigations
  The process of drilling and bolting the roof is currently one of the most dangerous jobs in underground mining, resulting in about 1,000 accidents with injuries each year in the United States. Researchers from the Spokane Research Laboratory of the Nat...
• Ignition Hazard From Internally-generated H2 in Sealed Mining Equipment
  7/1/2001 - Peer reviewed journal articles
  A number of ignition incidents involving mining and farm equipment have illustrated the surprising danger of drilling, cutting, or otherwise penetrating sealed compartments or frames that are filled with metal scrap for ballast.
• In-Mine Test of the Bureau of Mines Preproduction Wireless Survey System
  1/1/1990 - Reports of Investigations
  The Bureau of Mines preproduction wireless survey system (WSS) and its performance during an in-mine test are discussed in this report. The WSS was developed to reduce downhole surveying time in order to increase the efficiency of drilling long horizont...
• Accurate Directional Borehole Drilling: A Case Study at Navajo Dam, New Mexico
  1/1/1987 - Reports of Investigations
  Describes a project conducted by the Bureau of Mines in which the accurate directional drilling of a borehole was demonstrated with the objective of intercepting a designated target.
• Drilling a Horizontal Coalbed Methane Drainage System from a Directional Surface Borehole
  1/1/1982 - Reports of Investigations
  Three long horizontal holes were drilled from a directionally drilled surface hole at the Emerald Mine near Waynesburg, Pennsylvania. The purpose was to adapt the technique of directional drilling for use in draining methane from coalbeds.
• Probability of Encountering Coalbed Discontinuities During Vertical and Horizontal Borehole Drilling
  1/1/1982 - Reports of Investigations
  Probabilities of encountering coalbed discontinuities during vertical or horizontal drilling in a specific coalbed can be estimated based on analysis of mined-out areas of the coalbed where the size, shape, orientation, and distribution of discontinuiti...
• Cableless Electronic Surveying Systems for Horizontal Holes
  9/1/1981 - Contract reports
  The purpose of this project was to enhance the Bureau of Mine's Cableless Electronic Survey System use to aid in the drilling of long boreholes in coal as part of the methane drainage program. The system that was ultimately developed was field tested an...
• Directional Drilling For Coalbed Degasification: Program Goals and Progress in 1978
  1/1/1979 - Reports of Investigations
  The Bureau of Mines is cooperating with the U.S. Department of Energy in a directional degasification project at the Emerald Mine near Waynesburg, Pennsylvania. This project is designed to combine the highly successful underground horizontal degasificat...
• Directionally Controlled Drilling To Horizontally Intercept Selected Strata, Upper Freeport Coalbed, Greene County, Pa.
  1/1/1977 - Reports of Investigations
  A 3-inch pilot hole was directionally drilled to intercept the Freeport coalbed horizon horizontally at Mather, Pennsylvania, as part of a Bureau of Mines degasification project. The original concept was to continue the horizontal drilling into the coal...