From : [url]Copper mineralisation at Redbank was discovered in 1916. Small scale-production between 1916 and 1957 yielded 1,200 imperial tons of copper ore at a grade higher than 30% Cu. Numerous companies investigated the area between the 1940s and early 1990s. A small open pit at the Sandy Flat deposit operated during the 1990s and processed 170,000t grading 5.4% copper, as well as leaving 54,000t grading 6.0% copper together with mining and processing infrastructure. [/url]