Museum Stores, formerly Morfa Copperworks rolling mill

The Museum Stores, formerly the Morfa Copperworks rolling mill, is a long, single-storey building dating from 1828. It features a gabled roof covered with corrugated material and topped by tall ventilators. The structure is mainly built of rubble sandstone with some brick infilling. The main elevation faces east and has stone walls at both ends, which are remnants of the original mill buildings. The southern section includes a series of infilled semi-circular arches typical of the period. The majority of the east elevation was once open, supported by massive timber purlins resting on impressive tapering cast iron columns, with the spaces between the columns later filled in with brick. The north elevation features a wide arch and circular ventilation openings above, which are now blocked. The south elevation is made of rubble stone and has a row of five round-headed windows, two of which are blocked, along with a row of three smaller blocked windows above.

Inside, the building is open to the roof along its entire length, with concrete floors and industrial shelving used for the storage of museum objects.