"Our hearts go out to the families and co-workers of Scott Baldwin, who was killed on March 19 in South Timaru, and the yet-unnamed worker, who died in Tauranga."
Mr Sissons said these deaths occurred despite health and safety laws being strengthened in 2013 in response to the recommendations of the Royal Commission into the tragedy at Pike River Mine.
Health and safety representatives visiting quarries and mines were needed, he said.
"Perhaps an industry health and safety representative might have provided advice that saved these workers' lives."
Mr Sissons said the Health and Safety Reform Bill currently before the parliamentary select committee could be amended to include quarries in the full range of mining protections.