40 CFR 440.40 - Applicability; description of the mercury ore subcategory.
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The provisions of subpart D are applicable to discharges from (a) mines, either open-pit or underground, that produce mercury ores; and (b) mills beneficiating mercury ores by gravity separation methods or by froth-flotation methods.
Title 40 published on 2012-07-01
no entries appear in the Federal Register after this date.