Opal HollowChapter 4
The Americans spent the next two days doing mining and safety inductions and examining the latest maps in the evenings. They then spent two more days in the main mine being shown how they were currently mining the opals and what boulder opals looked like in their natural state. Both Mark and Bambie found the tours, the geology of the caverns and the mining procedures fascinating. In preparation for their arrival, Smithy had the entrance cavity to the caverns they were to survey, hollowed...