Mining Act Article 21

The applicant of a mineral right may for the cause of mining interest apply for increase or decrease the acreage of the claimed area; however, the acreage of the claimed area shall remain subject to the provision of Article 9.
中文原文 礦業法第21條
礦業申請人得因礦利關係,申請增減其所申請區域之面積;其礦區之面積,仍應受第九條規定之限制。

English translation for reference only; the Chinese text prevails. Not legal advice.