[3] The limestone holds other minerals, including nickel and copper deposits, making it an ideal site for mining.

From the mid-18th century, Rhydymwyn was the site for a range of industries, which included foundries, waterwheels as well as mine workings.

Building P6 on the site was used for the experimental production of Uranium-235 by the gaseous diffusion method as part of the Tube Alloys project, until work on the development of the atomic bomb was transferred to North America following the Quebec Agreement of 1943.

Along the main road from the old Sardis Chapel, and only a few feet from the edge of the A541 there is an ancient well - Ffynnon leinw - (leinw comes from the Welsh word "llanw" meaning tide as it is reported that the water in the well rose and ebbed with the tides of the Dee Estuary).

[9] Charles Kingsley, author of The Water-Babies, A Fairy Tale for a Land Baby, also came and walked the Leete; both his and Mendelssohn's visits are commemorated by a plaque in Nant Alyn Road, Rhydymwyn.