construction purposes due to high material would first need to be dewatered terrestrial environmental and handling facilities and FILL (supra-tidal) sand and gravel content, however and treated prior to use for fill. This would values to clear sufficient land infrastructure are not they would need to be separated. require a large area of land for drying ponds. to dry material prior to constraints As Gladstone is highly undulating, the flat dredging would be a areas are within the near shore constraint. Ongoing environment. The majority of land in discharges of waste water Gladstone is already owned for industrial during works as part of the de purposes. The remaining areas have high watering process. value mangrove and wetland habitat. Land availability is a constraint. MINE The nature of the material at Gladstone is highly industrialised and land is Significant impacts on No de-watering and drying REHABILITATION Gladstone being dominated by of prime importance for a growing mining terrestrial or wetland facilities in place currently. coarse grains, the material may be industry. To use the material for mine environmental values to clear Transport of dried material, suitable for mine capping as capping purposes, the material would first sufficient land to dry material once created would be difficult engineered fill. The material may be need to be dewatered and treated prior to prior to dredging. Ongoing by road, would involve large suitable for rehabilitation of mine use for fill. This would require a large area of discharges of waste water amounts of rehandling and site (revegetation), however, the land for drying ponds. There may be during works as part of the de truck movements. high salt content may be an issue. possible areas in the southern area of the watering process. Positive harbour of Boyne Island and Tannum Sands environmental impacts may and mine sites of Boyne Island may require be revegetation of mine site capping material. The benefits of developing for future land use, however, a large drying area for the processing of the material may need high material and subsequent loss of near shore processing and treatment to habitat would have to outweigh the impact enable it suitable for on environmental values. revegetation purposes. The benefits of revegetation of the
FILL (supra-tidal) construction purposes due to high sand and gravel content, however they would need to be separated. material would first need to be dewatered and treated prior to use for fill. This would require a large area of land for drying ponds. As Gladstone is highly undulating, the flat areas are within the near shore environment. The majority of land in Gladstone is already owned for industrial purposes. The remaining areas have high value mangrove and wetland habitat. Land availability is a constraint. terrestrial environmental values to clear sufficient land to dry material prior to dredging would be a constraint. Ongoing discharges of waste water during works as part of the de watering process. and handling facilities and infrastructure are not constraints MINE REHABILITATION The nature of the material at Gladstone being dominated by coarse grains, the material may be suitable for mine capping as engineered fill. The material may be suitable for rehabilitation of mine site (revegetation), however, the high salt content may be an issue. Gladstone is highly industrialised and land is of prime importance for a growing mining industry. To use the material for mine capping purposes, the material would first need to be dewatered and treated prior to use for fill. This would require a large area of land for drying ponds. There may be possible areas in the southern area of the harbour of Boyne Island and Tannum Sands and mine sites of Boyne Island may require capping material. The benefits of developing a large drying area for the processing of material and subsequent loss of near shore habitat would have to outweigh the impact on environmental values. Significant impacts on terrestrial or wetland environmental values to clear sufficient land to dry material prior to dredging. Ongoing discharges of waste water during works as part of the de watering process. Positive environmental impacts may be revegetation of mine site for future land use, however, the material may need high processing and treatment to enable it suitable for revegetation purposes. The benefits of revegetation of the No de-watering and drying facilities in place currently. Transport of dried material, once created would be difficult by road, would involve large amounts of rehandling and truck movements.
gbr-dredge-material-management-appendixa.docx