The simplest form of opal mining is by shaft sinking with a pick and shovel. A shaft is sunk straight down until some promising "opal dirt" was discovered. Length of the shaft might be as short as three metres or as long as 20 metres. A handpick or screwdriver is commonly used to extract any opal found, Should you beloved this information and you would want ...
JudsonNeble
Sunday 01:51
