About 87 percent of Port Lincoln's construction sand is obtained from the coastal zone about 20 km north of the city. The remainder, from Strawberry Hill, contains about 10% fines and is blended with clean sand from Louth Bay to meet specifications. To locate alternative sources outside the coastal zone, known deposits in the Central Basin and adjacent western margin of the Lincoln Uplands were examined. Several drillholes west and north of Wanilla have intersected significant thicknesses of coarser sand and gravel. Additional drilling would be needed to establish sufficient reserves to maintain long term mining. This sand would require washing to remove fines. The coastal sand requires only simple screening to remove over-sized material and is preferred by local consumers to that from Strawberry Hill. Zoning of these coastal deposits for extractive industry is essential to ensure their long term availability.