This tour is concerned with aspects of the soils, geology, landforms, clays and mining on Yorke Peninsula, and likewise for the northern Adelaide Plains which are separated from the Peninsula by Gulf St Vincent. Both of these regions are among the most productive cereal-growing areas of South Australia, agricultural development having spread from Adelaide to these districts soon after the initial settlement of the State which took place in 1836. Sheep were first grazed on Yorke Peninsula in the early 1850s; but the main impetus to development came with the discovery of copper at Kadina (1860) and Moonta (1861), the subdivision of land for agriculture during the 1860s and 1870s, and the completion in the 1870s of railways linking the towns of Kadina, Wallaroo, Moonta, and Adelaide. The local production of copper was important until 1923, with mining ceasing in 1938; at one stage 77 mines were in operation. Specific conference topics that have been reprised, and related sites of interest visited during this tour, include: - Desert loam soil characteristics; - Dublin Waste Landfill Site; - Ardrossan Dolomite Quarry; - Pine Point kaolin deposit; - Klein Point Limestone Quarry; - Moonta copper mining district; - Wheal Hughes open cut Mine; - Association of halloysite with Cu-Au mineralisation at the Poona copper Mine; - Samphire soils of the upper Gulf St Vincent; - Saint Kilda Mangrove Walk; - Acid sulphate soils in the Barker Inlet area; and - Mineralogical and chemical changes to the University of SA tillage test track soil, following 10,000 cultivations!