JUSTICE WHITE delivered the opinion of the Court.
In April and July 1977, the Environmental Protection Agency (EPA), acting under the Federal Water Pollution Control Act (Act), as amended, 86 Stat. 816, 33 U. S. C. § 1251 et seq., promulgated pollution discharge limitations for the coal mining industry and for that portion of the mineral mining and processing industry comprising the crushed-stone, construction-sand, and gravel categories.
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