opencast /ˈoʊpənˌkæst/ Brit /ˈəʊpənˌkɑːst/ adjective /ˈoʊpənˌkæst/ Brit /ˈəʊpənˌkɑːst/
adjective
Learner's definition of OPENCAST
British
: involving the removal of the surface of a large area of land to get at coal or other material that is near to the surface露天开采的