St. Aubyn mine
St. Aubyn mine included North Wheal Grambler, King's shaft, Old Engine shaft, William's shaft, Michell's shaft and Perkin's shaft. There are several other shafts in the complex that made up St Aubyn United in 1834, when it was amalgamated with Wheal Grambler. Although sizeable amounts of copper were mined, it was never very profitable. A report in 1840 indicated that some £10,000 had been invested but, the ores mined at that time, had only returned £618. However, between 1873 and 1876 1,379 tons of 8.25% copper ore and 25 tons of black tin were produced. The mine finally closed in 1893.
The engine house, a privately owned grade II listed building, which stands over St. Aubyn's shaft is one of a few engine houses that retain the brick top to its chimney and is the only complete engine house in St. Day Parish. There is evidence of the mining waste dumps in the area. Taking the lane to the west, passing the engine house on your left, to South Trefula the workings covered the area on both sides of the road and there is evidence of capped shafts.
The cache is on the footpath beside Perkin's shaft, do not wander off the defined footpath.
Bonus co-ordinate C = between 1873 and 1876 St Aubyn mine produced 1,3C9 tons of copper ore.
Please bring pen or pencil. You are looking for a 35mm film container.