Blasthole Depth and Stemming Height Systems

Details

• Personal Author:
  Konya CJ ; Skidmore DR
• Description:
  Overloaded blastholes and insufficient stemming are major factors in flyrock accidents at surface metal and nonmetal mines. Accurate measurement of blasthole depth, stemming height, and water depth would reduce the overload and the probability of blowout, flyrock, excessive ground vibration, and airblast. Problems result because current measuring systems are inaccurate and often difficult to use. A literature survey determined measurement techniques and blasting parameters prior to 1970. Similar data were gathered for current practices in 11 iron mines, 30 copper mines, and 92 quarries. Most operations used a cloth tape to measure borehole depth and stemming height; approximately 10 of the operations had dry blastholes. Candidate measuring techniques with best potential for improvement over the present weighted tape method are disposable tapes or string chains, automated readout tapes, modified sludge level indicators, and acoustic reasonance methods. [Description provided by NIOSH]
• Subjects:
  Occupational Health Safety
• Series:
  Mining Publications
• Subseries:
  Open File Report
• Publisher:
  Bureau of Mines
• Document Type:
  Text
• Genre:
  Conference Publications ; Final Contract Report
• Place as Subject:
  District of Columbia ; Minnesota ; OSHA Region 3 ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  TCRC - Twin Cities Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-57
• NIOSHTIC Number:
  nn:10003278
• NTIS Accession Number:
  PB84-142694
• Citation:
  Washington, DC: U.S. Department of the Interior, Bureau of Mines, OFR 4-84, Contract J0208022, 1981 Jun; :1-67
• Federal Fiscal Year:
  1981
• Performing Organization:
  Intercontinental Dev. Corp.
• Peer Reviewed:
  False
• Source Full Name:
  U.S. Department of the Interior, Bureau of Mines, OFR 4-84, Contract J0208022
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:611930276ab8e5659cd5fe6acf4003e97b4b3fa3b29db8eb50cbfa5f2526a3a9bcaaf0e6bb622f304523b76e66a86e1e5a96f674c5aed8cd6b0a29ee536ed4cc
• Download URL:
  https://stacks.cdc.gov/view/cdc/206683/cdc_206683_DS1.pdf
• File Type:
  [PDF - 2.25 MB ]