The area was originally all wetlands owned by John Crichton-Stuart, 2nd Marquess of Bute. He was persuaded to finance construction of the dock on his land at a cost of over £350,000. The dock opened under the name "West Bute Dock" on 8 October 1839, and was over 1400 yards (1280 m) long and 200 feet (60 m) wide, allowing 300 vessels to berth at any time. The dock was joined by four others: East Bute Dock, Roath Basin, Roath Dock and Queen Alexandra Dock. Cardiff had become the largest exporter of coal in the world; in 1913, Cardiff exported 10,700,000 tonnes of coal. However, the Great Depression, Second World War and cheap foreign competition all caused massive damage to the Welsh coal mining industry, with the last coal export through the dock taking place in 1964. The dock was filled in to prevent collapse of the surrounding walls.