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In New Zealand Otago and West Coast gold is purer 93 98% gold with 2 7% silver or silver plus mercury while on the Coromandel Peninsula it occurs as the gold silver alloy electrum typically 65% gold and 35% silver in the Martha mine at Waihī along with separate sulfide minerals

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Free program design Surface coal mining methods in the steep terrain of the central Appalachian coalfields include mountaintop removal New Zealand May 2021

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