This trail will introduce many of the rocks that give the landscape of the North Pennines its unique character. The route crosses a number of mineral veins that were once worked commercially and the remnants of mining operations can be seen in several places. Many of the old workings may be unstable - please keep to the footpaths and do not attempt to enter old tunnels or surface excavations. Do examine the rocks and minerals you will see along the route, but please do not collect them: leave them for others to enjoy.