Field Studies in an Unsupported Roof, York Canyon Coal Mine, Raton, New Mexico.
NTIS: PB 231 122 :18 pages
Infrared and displacement studies were made of an unsupported roof in Kaiser Steel Corp.'s York Canyon Coal Mine, Raton, New Mexico. Monitoring of the roof continued until the roof over the area was caved. Loose slabs in the roof, about 6 inches thick, were detected by means of associated thermal anomalies, using remote-sensing infrared instruments. Displacement measurements taken during the study indicate that roof movement was cyclic in nature; the cycles appear to have been related to the mine work cycle (work days to idle days).
IH; Report of Investigations
NTIS Accession No.
NTIS: PB 231 122