Located about 1.5km east of the Tung-yeh-chen hematite deposit. Chert, penetrated by ferruginous quartz veins, worked for "silica stone" ("brick silica stone").
Ref: Iwao, S. (1969) Banded magnetite ore deposits and metamorphic rocks in the vicinity of Yen-tou-tsun, Wu-tai-shan, Shan-hsi province, China (with appendix on hematite ore deposits in the vicinity of Ting-hsiang and Tung-yeh-chen). (In: Geology and Mineral Resources of the Far East, Vol 2, pp 425-441, Tokyo University Press).
