Influence of site-specific geology on oil shale fragmentation experiments at the Colony Mine, Garfield County, Colorado

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The Los Alamos National Laboratory executed 19 intermediate scale cratering experiments in oil shale at the Colony Mine in Garfield County, Colorado. These experiments have led to a better understanding of fracture characteristics and fragmentation of in situ oil shale by use of a conventional high explosive. Geologic site characterization included detailed mapping, coring, and sample analyses. Site-specific geology was observed to be a major influence on the resulting crater geometry. The joint patterns at the experimental site frequently defined the final crater symmetry. Secondary influences included vugs, lithology changes, and grade fluctuations in the local stratigraphy. Most experiments, in ... continued below

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Pages: 49

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Ray, J.M.; Harper, M.D.; Craig, J.L. & Edwards, C.L. January 1, 1982.

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The Los Alamos National Laboratory executed 19 intermediate scale cratering experiments in oil shale at the Colony Mine in Garfield County, Colorado. These experiments have led to a better understanding of fracture characteristics and fragmentation of in situ oil shale by use of a conventional high explosive. Geologic site characterization included detailed mapping, coring, and sample analyses. Site-specific geology was observed to be a major influence on the resulting crater geometry. The joint patterns at the experimental site frequently defined the final crater symmetry. Secondary influences included vugs, lithology changes, and grade fluctuations in the local stratigraphy. Most experiments, in both the rib and floor, were conducted to obtain data to investigate the fragmentation results within the craters. The rubble was screened for fragment-size distributions. Geologic features in proximity to the explosive charge had minimal effect on the rubble due to the overpowering effect of the detonation. However, these same features became more influential on the fracture and rubble characteristics with greater distances from the shothole. Postshot cores revealed a direct relationship between the grade of the oil shale and its susceptibility to fracturing. The Colony Mine experiments have demonstrated the significant role of geology in high explosive/oil shale interaction. It is probable that this role will have to be considered for larger applications to blast patterns and potential problems in retort stability in the future of oil shale development.

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Pages: 49

Notes

NTIS, PC A03/MF A01.

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  • 1. international conference on stability in underground mining, Vancouver, BC, Canada, 16 Aug 1982

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  • Other: DE82017359
  • Report No.: LA-UR-82-1852
  • Report No.: CONF-820826-1
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 5263735
  • Archival Resource Key: ark:/67531/metadc1072308

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 1, 1982

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  • Feb. 4, 2018, 10:51 a.m.

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  • April 4, 2018, 12:42 p.m.

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Ray, J.M.; Harper, M.D.; Craig, J.L. & Edwards, C.L. Influence of site-specific geology on oil shale fragmentation experiments at the Colony Mine, Garfield County, Colorado, article, January 1, 1982; United States. (digital.library.unt.edu/ark:/67531/metadc1072308/: accessed May 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.