Agency targets safety on roof falls, 'rib rolls'

摘要

Arlington, VA - The Mine Safety and Health Administration recently launched an outreach program that is designed to highlight the potential dangers of roof falls and rib rolls. A rib roll refers to loose material that falls from a pillar or barrier of coal left for support. Eighty percent of roof fall injury accidents occur under supported roofs, MSHA said. A majority of accidents occur during summer months because warm, humid summer air carries moisture into the mines, threatening supports, according to the agency.