Engine House North Wheal (Innes) Shaft, East Wheal Rose Mine, And Associated Works

The Engine House at North Wheal (Innes) Shaft, part of the East Wheal Rose Mine, was built between 1881 and 1882 to extract lead and silver from depths of up to 170 fathoms. Constructed from killas stone and granite, it features pale buff brick quoins and dressings, and originally had a local slate roof, which collapsed in November 1987. The building has a rectangular plan and includes brick cheeks against the north gable that once supported a condenser cistern. There is a square opening at the front leading to the shaft, and on the east side, there are remnants of walls from a structure of unknown purpose, possibly a capstan base.

Underground flues extend approximately 53 meters to a chimney to the east, passing the sites of five or seven boilers, with the flues returning behind the boilers to the south end of the engine house. The ground floor features a low opening to the west, while the first floor has large wide arched openings in both gables to accommodate the arms of the bob, with the northern opening later narrowed. The upper floor contains deep rectangular slot openings—two on the east, four on the south, and two on the west—along with similar openings on the top dressing floor.

The south gable includes a circular feature with a cross, commemorating the tragic disaster on July 9, 1846, when 39 miners lost their lives in a flash flood. The engine housed within was the renowned Harvey's 100-inch engine, originally built for the Great Wheal Vor mine in 1854 and later used at the Hendre Lead Mine in Flintshire. This engine was the largest ever made and was fitted with a new 55-ton bob. After the mine's closure, it was sold to the Cumberland Iron Mining and Smelting Company (Whitchem Mines).