Source of slag crossword clue

Hello crossword solvers! Today let's find the answer to the clue Source of slag from the USA Today crossword. After we've gathered any other hints from the USA Today crossword puzzle and all possible helpful and relevant information from other sources, we are ready to solve the clue Source of slag. The answer we found for the clue Source of slag is:

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The answer has 3 letters: ORE

Last usage in USA Today crossword puzzle.