godan verb (-su), transitive verb
work out a mine; exhaust a vein of ore
Used for mining contexts: digging until the resource is depleted. Can also be used figuratively for exhausting a topic or source.
その鉱山は金を掘り尽くして閉山した。
The mine was closed after it had exhausted its gold.
彼はそのテーマについて資料を掘
He exhausted all the materials on that topic.