The Cathole Vein runs east from the River Alyn and follows the same path as the Loggerheads to Mold Road, crossing at Parc Arthur Farm, where it was worked close to the surface. The area surrounding the mine, including the old mine track of Cathole West, now lies adjacent to Loggerheads Country Park and is used by the public.

The Cathole and Gwernymynydd Mines were responsible for large-scale operations starting around 1820. The Glan Alun adit, built by John Taylor & Co., runs from the River Alyn to the Francis Engine Shaft, which remains overgrown and filled in today.

Additional key shafts include Taylor’s Flat Rod Shaft, overgrown and filled in near SJ 2093 6274, located to the west of the Cathole-Gwernaffield Road, and the Old Whim Shaft, located to the north-west near SJ 2032 6291. The Old Engine Shaft near Cefn Mawr Hall is located at SJ 2045 6305.

The main Cathole site, along with the later Mold Mines, lies in an area of woodland to the east of the Cadole to Gwernaffield Road, specifically at SJ 2080 6280, where the Cathole Engine Shaft remains. Taylor’s Shaft was located near the road junction at SJ 2060 6270.

The Cathole Vein runs eastward from the River Alyn, passing through Carboniferous Limestone. Early documentary evidence, including leases deposited at the CRO in Hawarden and referenced in Williams (1987), confirms small-scale mining activities in this area on land owned by the Grosvenors on Mold Mountain.

Large-scale mining operations began around 1820, focused on both the Pilkington’s and Cathole Veins, conducted by the Cathole and Gwernymynydd Mines. John Taylor & Co. operated the Cathole mine from 1825 to 1845 with great success. In 1869, The Perran Foundry in Cornwall built an 80“ engine for the Cathole mine (Barton 1965).

The Glan Alun adit, cut by John Taylor & Co., runs from the River Alyn to the Francis Engine Shaft, which was sunk to a depth of 145 feet. The Sea Level Tunnel, constructed by the Halkyn District United Mines Ltd., reached the area in 1958 to drain the mines. Prior to this, the mines were drained via the adit, which emerges east of Gwernymynydd Farm.

A map from the 1750s, deposited at CRO Hawarden, shows that horse whims were already in operation in the area.

The area surrounding the mine, including the old mine track of Cathole West, is now used by the public and lies adjacent to Loggerheads Country Park.