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Results 1 - 10 of 72
8/20/2013 - PC softwareSoftware for designing pillars for room-and-pillar retreat mining.
Engineering Considerations and Selection Criteria for Proximity Warning Systems for Mining Operations9/19/2012 - Unpublished documents and reportsA Proximity Warning System (PWS) marker on each worker that is activated as he or she approaches a dangerous area could alert the operator and prevent a potential injury or fatality.
1/1/2011 - Peer reviewed journal articlesStone mines in the eastern and midwestern United States use the room-and-pillar method of mining to extract relatively flat-laying sedimentary formations. A survey of pillar performance was carried out to identify potential modes of instability.
1/1/2011 - Reports of InvestigationsDust surveys determined if deep-cut mining expose face workers to higher levels of respirable dust. Study findings indicate that levels on bolting faces did not appear to be affected by longer cycles associated with deep-cut mining practices.
7/1/2010 - Conference papersThis paper makes use of numerical models to examine the interaction between typical pillar systems and the surrounding rock mass for weak and strong geological conditions at various spans and depths of cover.
This NIOSH publication demonstrates how existing and new engineering controls can be used to reduce face methane levels.
2/1/2010 - Conference papersThis paper describes field tests conducted by NIOSH to evaluate the effectiveness of a wet head continuous mining machine for reducing dust exposure for continuous miner operators.
Continuous Miner Spray Considerations for Optimizing Scrubber Performance in Exhaust Ventilation Systems2/1/2010 - Conference papersThis paper describes lab experiments to examine the effect of spray type, pressure, machine body blocking sprays, and scrubber airflow on dust and gas levels while using a 12.2 m (40 ft) exhaust ventilation curtain setback from the face.
2/1/2010 - Unpublished documents and reportsIn the FY 2008 Appropriation (Public Law 110-161), Congress directed NIOSH to conduct "a study of the recovery of coal pillars through retreat room-and-pillar mining practices in underground coal mines at depths greater than 1,500 ft." This report inclu...
10/1/2009 - Peer reviewed journal articlesInstruments remaining in a test section of a lead/zinc/copper room and pillar mine where pillar mining had taken place 14 years before were read to monitor long-term stability and quantify time dependent behavior in the mine roof and backfill.