Klondyke Mill was an ore processing mill on the edge of the Gwydir Forest, near Trefriw, north Wales. Constructed in 1900, the mill was built to receive lead ore (and some zinc ore) from Pandora mine, some 2 miles away – with which its history is inextricably linked – this ore travelling along a tramway which followed the eastern shore of Llyn Geirionydd. The mill saw little usage; Pandora mine was never profitable after construction of the mill, and the mine ceased operation in 1905. Klondyke mill itself closed in 1911 after having a short succession of optimistic owners.