In the Colonies and Boer Republics which became the Union of South Africa in 1910, several unofficial military decorations and medals were instituted and awarded during the nineteenth and early twentieth century. The Cape Copper Company Medal for the Defence of O'okiep is a private campaign medal which was instituted by the Cape Copper Company Limited in 1902. The medal was awarded to members of the O'okiep Garrison who defended the town while it was besieged by Boer Commandos from 4 April to 4 May 1902, near the end of the Second Boer War.