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There are two engine houses at the Crowns. The lower house held a 30-inch pumping engine, built in 1835 to replace a smaller engine at the same location. It was built on the bare rock with no foundations, the rocks being bolted and mortared in place.This building weighs around 1200 tons, all brought down the cliff. In addition the metal work weight about 100 tons. Above this is the winder for the Boscawen Diagonal Shaft, built in about 1860. The boiler was brought from a boiler house on the cliff to the north.
Above these engine houses are the remains of two others, the Wheal Hazard whim to the south and the Carn whim directly over the Crowns which raised ore from the surface of the Crowns section and also drove rollers for crushing copper ore. The stack and engine bed-stone still remain here.