How many letters does the top answer for “(of mines and mining) worked from the exposed surface” have?

The most common answer is opencast (8 letters).

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Crossword clue: (of mines and mining) worked from the exposed surface

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

opencast 8 letters wn-def

(of mines and mining) worked from the exposed surface

Pattern

Data: SCOWL, igerman98, RLA-ES, Grammalecte, br.ispell · frequency: OpenSubtitles (see Data & licenses)