Smeltery waste NYT crossword answer is:
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The smeltery waste crossword clue from the New York Times on July 8, 2023 is "Byproduct of metal extraction". This clue refers to the waste materials that are produced during the process of extracting metals from ore. This waste can include slag, ash, and other materials that are left over after the metal has been extracted. This waste can be hazardous to the environment and must be disposed of properly.