It includes a quarry with a collection of antique machinery, such as locomotives and cranes, an underground tour of a simulated mine, a geological and mining museum, and mineral panning.
Threlkeld Quarry originally opened in 1870 to supply railway ballast to the Penrith-Keswick line.
Later, the stone was used by the Manchester Corporation Water Works for their Thirlmere scheme, for railway ballast for the Crewe-Carlisle line, for roadstone, kerbing, and for facing buildings with dressed stone.
This 0-4-0 saddle tank narrow gauge locomotive worked at BICC in Kent until 1968.
The locomotive completed the first full season of work at Threlkeld Quarry and Mining Museum in 2010.