Mr CHENG Wai-shun, Wilson, Geotechnical Engineer of the GEO, says that quarrying in the early days mainly relied on workers to use hammers, chisels and wedges to break stones off the rock mass, then crush them one by one with a hammer. Later, the industry adopted “controlled blasting” for rock extraction to enhance efficiency.

Mr CHENG Wai-shun, Wilson, Geotechnical Engineer of the GEO, says that quarrying in the early days mainly relied on workers to use hammers, chisels and wedges to break stones off the rock mass, then crush them one by one with a hammer. Later, the industry adopted “controlled blasting” for rock extraction to enhance efficiency.

Mr CHENG Wai-shun, Wilson, Geotechnical Engineer of the GEO, says that quarrying in the early days mainly relied on workers to use hammers, chisels and wedges to break stones off the rock mass, then crush them one by one with a hammer. Later, the industry adopted “controlled blasting” for rock extraction to enhance efficiency.