The mine has estimated reserves of 150.4 million ounces of silver.

[1] It was named after George Fisher, the former chairman of Mount Isa Mines.

From 1950, shafts were sunk to determine the size of the ore body which were promising, but heavy flows of water interfered with the exploration and the potential to mine the site.

However, exploration continued on a small scale for many years with better ventilation and pumping to establish the extent of the ore body, while finding ways to manage the water.

[6] The mine utilises a ground-mounted friction hoist which lifts ore from a depth of over 1.1 kilometres (0.68 mi).