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Extracting a deposit exclusively by open-pit mining means leaving money in the ground.
Does the combined strategy refer to a staged sequence—i.e., first exhausting the economic pit limit and then proceeding with underground mining—or to a parallel approach, simultaneously developing both open-pit and underground mining fronts?
Does the combined strategy refer to a staged sequence—i.e., first exhausting the economic pit limit and then proceeding with underground mining—or to a parallel approach, simultaneously developing both open-pit and underground mining fronts?
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