Gina Rinehart

Australia's richest citizen built her wealth on iron ore, an industry that continues to expand robustly. Rinehart continues to be embroiled in litigation with two of her children, and also with Wright Prospecting, owned by her father's original partner. The daughter of high profile iron-ore explorer Lang Hancock, Gina took her late father's bankrupted estate and rebuilt it into something much larger.The biggest piece of her fortune comes from the Roy Hill mining project, which started shipments to Asia in 2015.The mining magnate is also Australia's third-largest cattle producer, with a portfolio of properties across the country.