This is a circular walk from Porthtowan to Chapel Porth and Banns Vale of just under 5 miles.
The walk starts at the beach car park and follows the coast path to the remains of the engine house at Wheal Charlotte, which is now little more than a wall with arch in it.
From here, the route crosses the copper lode and descends to Chapel Porth, home of both the Bolster Day Festival and World Bellyboarding Championship.
The route then follows the valley of Chapel Coombe, passing the engine house of Charlotte United Mine. The valley is dotted with mineshafts, sunk to reach the copper lode, which crosses the valley, in the hope of finding where it widens towards Wheal Charlotte.
The route then follows a footpath to the ridge at Towan Cross and descends again to the wooded valley of Banns Vale. The walk follows a bridleway to a sacred spring, festooned with new-age offerings of varying originality. The route then follows the river through the woods to the remains of the Tywarnhayle mine.
The final leg follows the valley back to the sea, passing the castellated remains of Wheal Ellen which was left incomplete when ore prices slumped. The route then passes relics from when Tywarnhayle revolutionised mining technology by pioneering recovery of metals from low-grade ores. Tywarnhayle was still used by the Royal College of Mines as its training mine until the 1980s.
The walk is available as a guided walk app for Android and also available in the iWalk app for iPhone.
There are also a several more St Agnes walks on the iwalknorthcornwall website.