Oberon Quarries aggregates conform to the requirements of AS2758.1, 1998, Aggregates and Rock for Engineering Purposes, Part 1 Concrete Aggregates. The basalt aggregate (blue metal) is low shrink and classified as being non-reactive to alkali’s. It also has a Sodium Sulphate, plus Wet / Dry Strength Variation Classification of A1.Petrographic. Analysis reveals that silica rich rocks were not detected.

Aggregates are produced to specification and are used in the production of concrete and asphalt. Typical aggregate sizes used are 7mm, 10mm, 14mm and 20mm. Similar sized aggregates are pre-coated and are used in the wearing surface of new roads and the maintenance of existing roads.