Results 1 - 2 of 2

• Propagation of UHF Radio Waves in Limestone Room and Pillar Mines
  1/1/1979 - Contract reports
  This report presents a mathematical model for the propagation of UHF radio waves in the large cross section tunnels of a room-and-pillar limestone mine and describes the analysis of a small amount of propagation data obtained. The model and analysis is ...
• Borehole Location System Concept Demonstration Tests
  9/1/1978 - Contract reports
  This report describes the feasibility test of an electromagnetic method for locating boreholes, with or without casing, that have been drilled in conjunction with mining operations but without precisely known locations with respect to the tunnel.