open-cut
adjective US uk/ˌəʊ.pənˈkʌt/ us/ˌoʊ.pənˈkʌt/ (also open-pit); (UK opencast)
（尤指煤）露天的，露天开采的
used to describe a place where minerals, especially coal, are taken from the surface of the ground rather than from passages dug under it, or relating to this way of getting minerals
open-cut mine/mining 露天矿场／采矿