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Surface Subsidence Over a Room-and-Pillar Mine in the Western United States.

PB93190379

Publication Date	1993
Personal Author	Magers, J. A.
Page Count	24
Abstract	The paper summarizes the results from the subsidence research study completed by the U.S. Bureau of Mines, at the Roadside Mine, Powderhorn Coal Company, Palisade, CO. The research was conducted from February 1981 to August 1985, with additional data obtained during July 1991 to evaluate residual subsidence. The Bureau studied subsidence at three distinct room-and-pillar sections at separate locations over the mine and determined the maximum subsidence values and surface profiles for each mining section. Maximum subsidence of 3.0 ft occured over the room-and-pillar sections with overburden depths ranging from 50 to 600 ft. Surface tension cracks occured and were still evident during the residual subsidence survey.
Keywords	Subsidence Room and pillar mining Coal mining Colorado Earth movements Monitoring Cracking(Fracturing) Roadside mine
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries 48F - Geology & Geophysics
Corporate Authors	Bureau of Mines, Denver, CO. Denver Research Center.
Supplemental Notes	See also PB86-106325 and PB92-158005. Library of Congress catalog card no. 93-2741.
Document Type	Technical Report
Title Note	Information circular/1993.
NTIS Issue Number	199316

Surface Subsidence Over a Room-and-Pillar Mine in the Western United States.

Surface Subsidence Over a Room-and-Pillar Mine in the Western United States.
PB93190379

Publication Date	1993
Personal Author	Magers, J. A.
Page Count	24
Abstract	The paper summarizes the results from the subsidence research study completed by the U.S. Bureau of Mines, at the Roadside Mine, Powderhorn Coal Company, Palisade, CO. The research was conducted from February 1981 to August 1985, with additional data obtained during July 1991 to evaluate residual subsidence. The Bureau studied subsidence at three distinct room-and-pillar sections at separate locations over the mine and determined the maximum subsidence values and surface profiles for each mining section. Maximum subsidence of 3.0 ft occured over the room-and-pillar sections with overburden depths ranging from 50 to 600 ft. Surface tension cracks occured and were still evident during the residual subsidence survey.
Keywords	Subsidence Room and pillar mining Coal mining Colorado Earth movements Monitoring Cracking(Fracturing) Roadside mine
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries 48F - Geology & Geophysics
Corporate Authors	Bureau of Mines, Denver, CO. Denver Research Center.
Supplemental Notes	See also PB86-106325 and PB92-158005. Library of Congress catalog card no. 93-2741.
Document Type	Technical Report
Title Note	Information circular/1993.
NTIS Issue Number	199316