coarser material including clay Causeway/jetty construction spillage. failure, equipment breakdown. lumps may not be feasible. may be required to offload if Additional handling required to pumping not feasible. transport material from shore line to fill site. The material is pumped The dredge vessel must be Coastal conditions can affect, Turbidity plumes, spills and MINE REHABILITATION directly from the dredger as a with suitable draft and delay and pose risk to failure of drying pond walls. slurry with water content manoeuvrability to be able to unloading and/or pumping Groundwater contamination at around 90 per cent. The get within close proximity to operations of material to shore capping site from chemical practical limit for pumping spoil the drying sites or to berth and increase the risk of leachate. Transportation and is 7-10 km. Greater distances facilities to pump the material. spillage. facility or storage infrastructure (> 10 km) may require the use Shallow harbours create failure, equipment breakdown. of booster pumps. problems for vessels to approach site within suitable distances for pipelines and pumping equipment. Type of material will determine Dredge vessel must be Coastal conditions may affect, Spills during works, turbidity SHORE whether it needs to be chosen with suitable draft and delay and pose risk to plumes. Project not successful PROTECTION/EROSION pumped or unloaded from manoeuvrability (many unloading and/or pumping due to wave action removing CONTROL vessel to shore , or unloaded harbours very shallow and operations of material to deposited sediments.
coarser material including clay lumps may not be feasible. Additional handling required to transport material from shore line to fill site. Causeway/jetty construction may be required to offload if pumping not feasible. spillage. failure, equipment breakdown. MINE REHABILITATION The material is pumped directly from the dredger as a slurry with water content around 90 per cent. The practical limit for pumping spoil is 7-10 km. Greater distances (> 10 km) may require the use of booster pumps. The dredge vessel must be with suitable draft and manoeuvrability to be able to get within close proximity to the drying sites or to berth facilities to pump the material. Shallow harbours create problems for vessels to approach site within suitable distances for pipelines and pumping equipment. Coastal conditions can affect, delay and pose risk to unloading and/or pumping operations of material to shore and increase the risk of spillage. Turbidity plumes, spills and failure of drying pond walls. Groundwater contamination at capping site from chemical leachate. Transportation and facility or storage infrastructure failure, equipment breakdown. SHORE PROTECTION/EROSION CONTROL Type of material will determine whether it needs to be pumped or unloaded from vessel to shore , or unloaded Dredge vessel must be chosen with suitable draft and manoeuvrability (many harbours very shallow and Coastal conditions may affect, delay and pose risk to unloading and/or pumping operations of material to Spills during works, turbidity plumes. Project not successful due to wave action removing deposited sediments.
gbr-dredge-material-management-appendixa.docx