Heath Mynd lies to the southeast of much be-cairned Corndon Hill and its steepness on all sides makes it a Marilyn. There is a complex cairn on the summit, which Pastscape give as a ring cairn surmounting a platform cairn:
A platform cairn surmounted by a ring cairn is situated at SO 33569408, upon the highest part of Heath Mynd at about 445.0m. above OD., in open moorland.
The platform cairn measures 20.5m. in diameter, and stands 0.7m. above present ground level. It is composed of mixed large and small stones, mossed over around the perimeter, but disturbed internally over much of its area; the stones having been scooped out to make sheep shelters in recent times (On the north-west side is a circular sheep shelter, 4.5m. across and 0.7m. high).
Within and against the perimeter on the north-east side, is a well-preserved ring cairn, measuring 8.5m. in diameter, and 0.6m. in height above the surface level of the platform cairn. It comprises an unbroken bark of large stones and boulders, 3.5m. in width, topped with a layer of small stone which is packed into the larger stones below, to give the cairn a well-finished appearance. Into the interior, (which is the surface of the platform cairn below) has been thrown a heap of large boulders in recent times. South-west of the centre of the platform cairn, an O.S. traingulation pillar has been erected.
The assemblance is reminiscent of the cairns on Allt Llwyd, Gwynedd