Waste silica depots
The Tasmanian Advanced Minerals (TAM) silica processing plant at Wynyard, Tasmania, processes raw silica sand extracted from its Corinna, Blackwater and Hawkes Creek pits located on the north-west coast of Tasmania. The ‘waste silica flour’ by-product is a potentially valuable resource but currently has no commercial market.
TAM had already investigated a number of alternative, sustainable reuse and waste management options, but environmental approvals, significant capital expenditure and the need for specialist equipment made them cost prohibitive.
pitt&sherry commenced an approvals process for two storage options: TAM’s existing Blackwater Mine waste stockpile area, and a new waste depot to be created in the Ponderosa area of Hanson Construction’s Calder gravel pits, located near the TAM processing plant.
The project will reinstate the landform mined out in the last century for hydro schemes, and will supply a landform for revegetation, and improved erosion and sediment control. Both depots have been operating successfully since 2012.