The miners begin by drilling a hole into the ground, until they reach the depth most common for opals. They descend into the shaft, then break away at the rock, using tools such as pickaxes and hand drills, until they find rock with a greenish tinge. This is a sign of opals. They break the rock apart, checking every chip for a hint of opal.
Source:https://www.youtube.com/watch?v=zHecdSDz4uU
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