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BOMCRATR: A Curved Ray Tomographic Computer Program for Geophysical Applications.

PB92193416

Publication Date	1992
Personal Author	Tweeton, D. R.; Jackson, M. J.; Roessler, K. S.
Page Count	48
Abstract	The U.S. Bureau of Mines has developed tomographic computer programs for geophysical applications. The programs were developed for predicting and monitoring the flow pattern of leach solution during in situ mining. The Bureau has also applied them to assessing high-wall blast damage and examining the integrity of mine-related geological structures. The report describes the curved ray program BOMCRATR (Bureau of Mines curved ray tomographic reconstruction), tells how to run it, and gives examples with synthetic and field data. BOMCRATR provides optional mathematical constraints to counteract the nonuniqueness of tomographic reconstructions with crosshole data. These constrains include limiting the maximum and minimum velocities, fixing the velocity at any point to any value, and establishing layers in which velocity does not vary with horizontal position. The user can test for nonuniqueness by varying the initial velocity pattern. The program can perform either curved or straight ray analysis. Ray paths are calculated analytically in triangular pixels, which is faster than incremental numerical approximations.
Keywords	Mining geology Geophysics Tomography Computer applications Leaching Data processing Ray tracing BOMCRATR computer program In situ mining
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries 48F - Geology & Geophysics
Corporate Authors	Bureau of Mines, Minneapolis, MN. Twin Cities Research Center.
Supplemental Notes	Library of Congress catalog no. 92-7388.
Document Type	Technical Report
Title Note	Rept. of investigations/1992.
NTIS Issue Number	199218

BOMCRATR: A Curved Ray Tomographic Computer Program for Geophysical Applications.

BOMCRATR: A Curved Ray Tomographic Computer Program for Geophysical Applications.
PB92193416

Publication Date	1992
Personal Author	Tweeton, D. R.; Jackson, M. J.; Roessler, K. S.
Page Count	48
Abstract	The U.S. Bureau of Mines has developed tomographic computer programs for geophysical applications. The programs were developed for predicting and monitoring the flow pattern of leach solution during in situ mining. The Bureau has also applied them to assessing high-wall blast damage and examining the integrity of mine-related geological structures. The report describes the curved ray program BOMCRATR (Bureau of Mines curved ray tomographic reconstruction), tells how to run it, and gives examples with synthetic and field data. BOMCRATR provides optional mathematical constraints to counteract the nonuniqueness of tomographic reconstructions with crosshole data. These constrains include limiting the maximum and minimum velocities, fixing the velocity at any point to any value, and establishing layers in which velocity does not vary with horizontal position. The user can test for nonuniqueness by varying the initial velocity pattern. The program can perform either curved or straight ray analysis. Ray paths are calculated analytically in triangular pixels, which is faster than incremental numerical approximations.
Keywords	Mining geology Geophysics Tomography Computer applications Leaching Data processing Ray tracing BOMCRATR computer program In situ mining
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries 48F - Geology & Geophysics
Corporate Authors	Bureau of Mines, Minneapolis, MN. Twin Cities Research Center.
Supplemental Notes	Library of Congress catalog no. 92-7388.
Document Type	Technical Report
Title Note	Rept. of investigations/1992.
NTIS Issue Number	199218