开采

开采	kāi cǎi	to extract (ore or other resource from a mine) / to exploit / to mine
开	kāi	to open (transitive or intransitive) / (of ships, vehicles, troops etc) to start / to turn on; to put in operation; to operate; to run / to boil / to write out (a prescription, check, invoice etc) / (directional complement) away; off / carat (gold) / abbr. for Kelvin, 开尔文 / abbr. for 开本, book format
采	cǎi	to pick / to pluck / to collect / to select / to choose / to gather
采	cǎi	color / complexion / looks / variant of 彩 / variant of 采
采	cài	used in 采邑 and 采地