Opencast and Stone pit

Opencast adjective - (of mines and mining) worked from the exposed surface.

Stone pit and opencast are semantically related in pit topic. In some cases you can use "Stone pit" instead a noun "Opencast", when it comes to topics like quarry.

Stone pit noun - A surface excavation for extracting stone or slate.

Opencast and stone pit are semantically related in pit topic. You can use "Opencast" instead a noun phrase "Stone pit", if it concerns topics such as quarry.