Sand and Gravel Excavation Act Article 6
The validity period of a Sand and Gravel Excavation Permit for river and water-area sand and gravel shall not exceed three years, and no extension shall be granted upon expiration.The validity period of a Sand and Gravel Excavation Permit for land-based sand and gravel, or coastal and sea sand and gravel, shall not exceed ten years; the same limit applies to each extension applied for upon expiration.
中文原文 土石採取法第6條
河川及水域之土石採取許可期限，最長以三年為限，期滿不得展延。
陸上土石、濱海及海域土石之土石採取許可期限，最長以十年為限；期滿申請展延者，亦同。
陸上土石、濱海及海域土石之土石採取許可期限，最長以十年為限；期滿申請展延者，亦同。