The South Minera Vein, a fault fissure rilled with mineral matter, ran through the area of Esclusham Mountain and, until the second decade of the 20th century, there were many lead mines in the area, some of whose levels joined with the substantial system of natural caves beneath the mountain.
[6] Though there may have been small-scale mining of lead on the mountain in earlier periods, development of the area's mineral resources started in earnest from the eighteenth century and into the nineteenth, with the application of techniques brought from Cornwall.
The lower eastern slopes of the mountain have a landscape of pastureland, small farms and woods.
There are still surface remains of former lead workings, particularly in the areas known as Pool Park and Gwter Siani, with the foundations of old engine-houses, managers' residences and chimneys being visible in some places.
A single-track road runs across the northern part of the mountain from Minera, through Pool Park and Gwter Siani, to Eglwyseg and on towards Llangollen.