The number of accidents involving roof and rib falls or coal bursts has significantly reduced. That's according to statistics compiled by the Mine Safety and Health Administration, which also found that such incidents remain the leading cause of injuries in the mining industry.

Since 2013, roof falls led to the deaths of five continuous mining machine operators and injured 83 other operators.
In response, MSHA launched the Preventive Roof/Rib Outreach Program, which runs through September and focuses on continuous mining machine operator safety.

Read entire article - https://www.msha.gov/news-media/press-releases/2017/07/06/roof-fall-accidents-decline-remain-leading-cause-coal-miner