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Safe, Effective Hangup Clearance for Underground Mines.

Lindroth DP; Anderson SJ
MISSING :12 pages
The Bureau of Mines has developed and successfully tested a hangup clearance module for use in clearing hangups in underground mine chutes and ore passes. The Bureau's tests showed that the hangup clearance module can be effectively used to clear mine hangups. Furthermore, it is believed that clearance using this module is quicker, safer, and more efficient than the method currently used. The hangup clearance module uses a ballistic disk explosive charge that can clear hangups located as far as 50 feet (15.2 M) from the position where the charge is detonated. Mine personnel can therefore set up the module and the charge it contains without being exposed to dangerous areas. This report describes the principles of operation of the module, provides data and drawings for its construction, and gives instructions for its setup and use. The report summarizes the development of the module, briefly discusses preliminary and underground tests, and lists the current and potential applications of the hangup clearance module to underground mining.
Publication Date
Document Type
IH; Report of Investigations
Fiscal Year
Identifying No.
RI 8651
NIOSH Division
Source Name
Page last reviewed: October 29, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division