発掘【はっくつ】
excavation, exhumation, digging up, unearthing, discovery (of a new fact, talent, etc.), finding, unearthing
採掘【さいくつ】
mining
掘る【ほる】
to dig, to excavate, to hollow, to delve into, to dig up (e.g. vegetables), (for two men) to have anal sex
掘り出し物【ほりだしもの】
(lucky) find, bargain, good buy, treasure trove
掘り返す【ほりかえす】
to dig up, to turn up, to tear up, to rake up (e.g. old scandal), to dig over