The project comprised of demolition works across two sites that are critical to Iluka Resources’ future plans for the clearing and rehabilitation of their Woornack, Rownack and Pirro mining and concentrating operations.
The WRP site works included the removal of the remaining Wet Concentrator Plant, WHIMS Building, Spiral Concentrator Building, Tails treatment building and thickeners, Flocculant Plant, Lime Plant, Process Water Dams, Mining Unit MU10, and removal of all redundant services. There was approximately 70klm of poly pipe to also be removed.
The key structural demolition works carried out at the WRP site were on the WHIMS Building, which stood 22 metres high, the WCP spirals 17 meters high and the 22 metres PCP Thickener. These structures were all successfully demolished utilising Liberty Industrial’s 120t high reach excavator with a 990R Genesis shear attachment which was able to comfortably reach the top of each structure and progressively demolish them to the ground.
The demolished pieces were then loaded out of the demolition zone utilising a smaller 38t excavator with grab attachment and a 40t articulated dump truck and taken to the allocated area for further processing prior to being sent to recycling facilities.
The poly pipe was cut, cleaned and loaded in 20-metre lengths for reuse in nearby farms, and the remaining poly pipes were delivered to a recycling yard in Adelaide. Naturally Occurring Radioactive Material (NORM) proved to be a challenge, with large volumes of testing and cleaning required, as well as the procedures involved with contaminated waste disposal.
A dedicated Radiation Safety Officer (RSO) was required to survey all recyclable and waste materials prior to leaving the site. For scrap and poly pipes with readings above the statutory limits, a pressure washer setup was utilised to remove the radioactive material. Location Ouyen, VIC Client Iluka Resources Duration 4 months Following the cleaning process the items would be re-tested and any items which still had high NORM readings were stockpiled and made ready for disposal to a licenced facility. The remaining items would be sent offsite for recycling, and all loads were tracked from point to point.
The Kulwin Site comprised of redundant low-lying steel structures from the original processing site, which was previously relocated to the WRP site and reconstructed. Also located in this area were large TSF settlement ponds, the walls of which were lined with poly dam liner.
The structures were demolished and removed from the site, and as per the WRP site, all materials leaving the site had to be tested and cleared of any NORM contamination prior to being allowed to leave the site which included 7.5km of poly dam liners. All concrete was transported to the WRP site for further processing and removed to a local recycler. The dam liners were removed utilising excavators with grab attachments rolled into sections and loaded out to recycling facilities.
Based on the successful completion of works at the WRP project and other contracts undertaken for Iluka Resources, Liberty Industrial was awarded Iluka’s Douglas Mine Site Demolition Project also located in Victoria.