A small mine near the shore of Nantymoch worked off and on until the turn of the century. The origins of this mine are unknown but very likely first worked by the Company of Adventurers in the 18th century. Later, it was often worked along with the Havan mine but the two never actually connected.

The mine was worked for lead, zinc, and copper. Little if any trace of lead mineralization is currently discernible, but there is plenty of secondary copper staining.