This is the site of an old tin mine known as the Cornwall Pit. At roughly 265m (870ft) deep, the terraced wall of the pit represents a century's worth of work that began in 1888 when a pound of tin was lifted out of a nearby creek. When the surface-metal was scoured from the landscape, methods changed eventually giving way to open-cut mining in the host pegmatite vein – an igneous rock with a coarse texture similar to granite.
