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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Mining waste:

SLAGHEAP: Coal mining waste
SLAG: Mining waste
SLAG: Coal mine waste
SLAGS: Mine wastes.
TAILINGS: Mining waste
SLAG: Mine waste
SLAG: Coal-mining waste
TEPETATE: Waste rock, in mining.
SLAGS: Turns into waste, at a coal mine