This site started as a surface quarry then later an underground mine. It consists of two deposits of very high quality ironstone. Little remains except two large troughs where the stone has been removed. The northerly one at the base of the incline to the kilns at Rosedale Chimney is known as Kitchings Deposit

Slightly further south is Garbutts Deposit

The stone has such a high iron content (approaching 50%) that its actually magnetic, although nothing similar was ever found elsewhere