|Statement||by Richard J. Mainiero and Harry C. Verakis.|
|Series||Information circular -- 9064., Information circular (United States. Bureau of Mines) -- 9064.|
|Contributions||Verakis, Harry C., 1942-, United States. Bureau of Mines.|
|The Physical Object|
|Pagination||12 p. :|
|Number of Pages||12|
|LC Control Number||85600287|
Title: Short-Delay Blasting in Underground Coal Mines Created Date: 3/9/ PM. The Bureau of Mines has conducted research to determine whether the total elapsed delay time for blasting bituminous coal in underground mines could be safely expanded beyond the present ms limitation without igniting a methane or methane-coal dust atmosphere. Blasting in Coal Mines •Modern mechanised coal mines use machines and longwall mining methods to cut solid coal and convey the broken coal out of underground workings. •Continuous mining equipment has escalated coal production and introduced more effective and efficient coal handling File Size: 3MB. EXPLO SIVES AN D. BLASTIN G IN U N D ERG RO U N D CO AL M IN IN G. INTRODUCTION All seams in underground coal mines are considered gassy, the degree of gassiness may vary from I to III. Methane gas that is released from during excavation when mixed in the proportions between % forms an explosive mixture. In underground coal mines, there is also an additional risk as coal dust .
There are 2 types of detonators: => Instantaneous Copper Electric Detonators(CED) => Copper Non-Incendive Short Delay Detonators(CDD) 8. PRINCIPLES OF BLASTING IN COAL Underground coal mining operations could be divided into two categories, . Carrick II Detonators are low incendive, short delay detonators approved for use in underground coal mines. They are an electric delay detonator, containing a sleeved fusehead, a delay element (except for 0 delay), a priming composition and a Tetryl base charge inside a cylindrical copper shell. This entry was posted in blasting, explosives and tagged blasting, blasting in mines, coal mines, drilling and blasting, explosives, gassy seam, methane, mines blasting, underground blasting, underground coal mines. Bookmark the permalink. Post navigation ←. Rock Blasting in Underground Mining /B In book: Rock Fracture and Blasting (pp) short delay time should be Author: Zongxian Zhang.
Get this from a library! Short-delay blasting in underground coal mines. [Richard J Mainiero; Harry C Verakis]. Blasting in Underground Bituminous Coal Mines The purpose of this program is to review the Safe blasting procedures for shotfirers in underground bituminous coal mines. 14 slides: Blasting Regulations Covers 29 CFR Part - General Industry, 29 CFR Part - Construction, BATF and DOT. 14 slides: Blasting Regulations. Blasting sequence at Goldcorp's Penasquito mine in Zacatecas, Mexico - Duration: MineSight , views. Short Delay Series detonators are designed for opencast and underground mines, for driving tunnels, shaft sinking and in quarries where multi shot rounds are required. Long Delay Series detonators are designed for underground mining for driving shafts and tunnels, blasting raises and shaft sinking.