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23 hours ago · Moonta. Copper, might be closed in 2014. 34°03′18″S 137°36′50″E / . 34.0550°S 137.6140°E. / -34.0550; 137.6140 ( Wheal Hughes) Umoona Opal Mine and Museum. South Australia. Coober Pedy. Opal, major parts of the city are underground, due to the excessive summer heat.