Assessing support packs from an occupational hygiene perspective

Abstract

Cementitious grout support packs are usually assessed for their strength and durability from a safety perspective. Formulations of these packs range from cement mixed with water to resin-based formulations. Over time, these packs start to crumble and fine dust is released into the workplace atmosphere. This paper presents the outcomes of a pilot study that was undertaken to assess the crystalline silica content in the fine fraction of different support-pack materials. The bulk materials had a fine fraction of between 0.2% and 1.3%. However, the crystalline silica concentrations in the fine fractions were between 2.5% and 41.9%. The amount of crystalline silica is significant and loose dust that is made airborne over prolonged periods of time, may pose a considerable health threat to mine employees.