Operated along the Afongoch Vein and the main veins of Trelogan and Pen-y-ffrith. Several shafts were located throughout the area, with notable shafts at West Whimsey, Roft, and Hannah. West Whimsey was situated on wasteground north of White Horse Farm, though the whim mechanism has been destroyed. Other shafts, such as at SJ 1206 8030, were associated with whim circles, and some, like the Roft Shaft, are now overgrown and difficult to detect.

The old mine offices at SJ 1262 8080 have been converted into two semi-detached dwellings, retaining much of their original architectural features. Other mine-related structures, such as stone revetment walls and a circular concrete platform, also survive in the area.

The Governor and Company for Smelting down Lead with Sea Coal, also known as the Quaker Company or later The London Lead Company, was granted a Royal Charter and began exploiting lead in Flintshire around 1700. Their mining operations at Trelogan and the Smelt Mill at Gadlys were prosperous from 1694. In the 19th century, the Trelogan Mining Company worked the Afongoch Vein, a prominent vein that ran east to west north of the road passing the Afongoch Inn. The mine remained active until it was re-opened in 1897 by Brunner Mond, operating until 1911.

The mine utilized a windmill in the 1730s for pumping, and the first Newcomen Engine in Flintshire was installed at Trelogan in 1732. Later, by the 19th century, larger engines, including 80“ pumping engines, were employed for mining operations. A variety of processing machinery was also in use, including a crushing setup powered by windmill sails.

The processing site for the mine was located to the north-west of Perth-y-maen, where waste and spoil heaps remain. A modern dressing plant with milling, winding, and other engines was sold in 1911. Remnants of bases for machinery and concrete platforms are still visible.