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Milling may be either ore dressing or metallurgy.

The mechanical processes designed to separate the ore from its enclosing rock or other superfluous earthy matter called gangue became known as ore dressing and ore concentrating.

It is the foundation of the art of ore dressing, one of the most important parts of metallurgy.

The question in ore dressing really is whether air can be made to work as well as water.

Mr. A. G. Charleton, the eminent English mining engineer and author of numerous books, in discussing this question, writes, "Personally, I am of the opinion that ore dressing should be included in mining."