The firm also owned brick works and the old Forest Spelter Works at Morriston; were colliery proprietors at Mynydd Newydd, Pentrefellen and Pentre; and had their own shipping offices at 6 Cambrian Place, Swansea. In addition, H.H. Vivian personally owned the Hafod Isha Nickel and Cobalt Works. In 1883 he formed the associated company of H.H. Vivian & Co. Ltd. to take over that works, along with German silver and brass rolling mills at Birmingham and a nickel mine and smelting works at Senjen in Norway. Between 1889 and 1894 the company owned and worked the Murray Mine near Sudbury, Ontario, during the period when the rich Canadian ores were displacing the nickel ores of Norway from the world market. By the mid-1880s, the quality of Cornish copper ore had decreased and it proved to be more economical to smelt ores at the mines in Chile and elsewhere. This situation led to the gradual cessation of copper smelting in the Swansea area. Other metalliferous industries took its place, as did a greater emphasis on engineering products. During the First World War, Vivians supplied the British Admiralty with brass tubes and condenser plates, more than doubling their output. The manufacture of shell driving bands was another notable contribution. Vivian & Sons traded from 1810 until 1924, becoming a limited company in 1916. During 1924-25, Vivians merged with two other Swansea firms – Williams, Foster and Company and Pascoe Grenfell and Sons (owned by Williams, Foster and Co. since 1897) – to form British Copper Manufacturers Ltd., which in 1928 was absorbed by Imperial Chemical Industries (ICI). The interests of the ICI Metals Division in the Lower Swansea Valley passed in 1957 to Yorkshire Imperial Metals, a joint enterprise with Yorkshire Copper Works Ltd. The combined Hafod and Morfa Works site continued rolling copper until its closure in 1980.