open-pit

adjective

🔊/ˌəʊpən ˈpɪt/

(North American English)

(British English opencast)

[usually before noun]

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in open-pit mines coal is taken directly out of the ground near the surface, without digging tunnels 露天开采的see also strip mining
Oxford Collocations Dictionary
Open-pit is used with these nouns:
mine
See full entry