鉱業
こうぎょう · kougyou · JLPT N1 · noun
industry
⛏️ 鉱 (ore, with metal radical 金) + 業 (industry) = the industry that digs ore out of the ground
鉱 has the metal radical 金 on its left, so it means ore. 業 means trade or industry. Together they name the business of extracting ore from the earth.