In 1929, "Mount Morgan Limited" was formed and continued until...

In 1929, "Mount Morgan Limited" was formed and continued until 1968, when Peko Wallsend Limited made a takeover, and Mount Morgan Limited became a subsidiary of Peko Wallsend Limited. Mining and treatment of Mount Morgan ore continued until the closure of the mine in July 1981.

Mined for 99 years, Mount Morgan yielded a total of 225,000 kg of gold, 50,000 kg of silver and 360,000 tonnes of copper; Ironstone Mountain became a very large hole -- 1066 feet (325 metres) deep from the original mountain top.

The Flash Smelter continued to operate at full capacity until 1984, treating copper concentrates from Peko-Wallsend's "Warrego Mine" near Tennant Creek (N.T.) but the concentrates became no longer available and the smelter ceased operations at the end of June, 1984.

A Carbon-in-Pulp Cyanide plant commenced operations in September 1982 to recover gold and silver from accumulated mill tailings, which still contained a gram of gold per tonne, ceased production on 9 November, 1990. This plant produced a further 13979.293 kg of Gold and 4535.167 kg of Silver.