Engine Vein

Gowther warns the children of the dangers of exploring the copper mines:

'"But when you're up th'Edge sees as you dunner venture down ony caves you might find, and keep an eye open for holes in the ground. Yon place is riddled with tunnels and shafts from the owd copper mines. If you went down theer and got lost that'd be the end of you, for even if you missed falling down a hole you'd wander about in the dark until you upped and died."'