The remains of mine workings can be seen across much of central and western Mendip, especially around Shipham, Charterhouse, Priddy and Stockhill Forest. Iron, lead, zinc and ochre have all been mined at various times and places across Mendip. The old mine workings are often characterised by areas of 'gruffy' ground, a local name for uneven hummocky landscape created during mining operations. On eastern Mendip, coal mining was more important.