National Geographic : 1942 Apr
(c) National Geographic Society Kodachrome byHowell Walker From Queensland's Rich Mount Isa Mine Come 4,000 Tons of Lead Bullion Each Month Intermingled with the lead ore is an annual output of 78 tons of silver. The lodes, in an area five miles long and onemile wide, will probably keep themine busy 75 more years. The project is American-managed. Australia's most famous silver-lead mining district isBroken Hill, inNew South Wales.