During the Ching Dynasty, when Taiwan became part of China, even more sulfur was mined in Taiwan. The Zhejiangese explorer Yu Yung-ho once crossed the strait to Taiwan to look for sulfur deposits during Kang Hsi's rule (1662- 1721). His search led him to Lungfengku.
台灣入清版圖後，採硫活動益增頻繁，康熙年間，浙江籍探險家郁永河，曾渡海來台探訪硫磺產地，行過山巔水湄，到達今日的龍鳳谷。