This area has a history of gold mining. Presently there is a quarry which creates a lots of white dust but Google has bee unable to provide me with information about what is mined here. One suspects brick making properties.
Historically though.....Workings at the Birdwood Goldfield extend over an area of ~7 x 5 km. Gold was first discovered in alluvial diggings in 1869, and the total recorded production is 622 kg. Production, which ceased in the 1930s, came mainly from quartz reefs but the large alluvial diggings also yielded large amounts. Workings extended across Adelaidean Burra Group and Cambrian Kanmantoo Group metasediments. The main producing mines were the Hynes Reef, Lucky Hit, Argosy and Black Snake.
taken from http://www.pir.sa.gov.au/minerals/geological_survey_of_sa/commodities/gold
You are looking for a plastic container with lots of swaps. Please be careful of the trucks and interested drivers.