So far ____________________ methods are economically feasible only with low-grade ores for which conventional mining methods are too expensive.

Name: So far ____________________ methods are economically feasible only with low-grade ores for which conventional mining methods are too expensive.
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The Answer of So far ____________________ methods are economically feasible only with low-grade ores for which conventional mining methods are too expensive.

So Far ____________________ Methods Are Economically Feasible Only with Low-Grade