Back in the early 50s, Clem Walton, a taxi driver and amateur prospector, set out with three of his sons, a local station hand and a Geiger Counter on a dry creek bed about 50 kilometres east of the Mt Isa copper mine.

As the party trod warily “the counter went off the scale”, indicating rich uranium reserves. The group pegged two mining leases, named the area Mary Kathleen after Walton’s recently deceased wife, and initiated talks with interested mining companies.