The co-disposal of colliery waste

![CDATA[Experiments conducted at Clarence Colliery into the potential for co-dispersal of the two rejects from Clarence Colliery and Kable's Transport Sand Mine suggested that the co-disposal option was beneficial and mutually beneficial to the two companies. Column experiments were undertaken to simulate field conditions consisting of creating the required co-disposal arrangement and structure in containers, infiltrating water through each container and measuring the rates of infiltration and overflow and measuring the chemical properties of the leachate water. Geotechnical tests of co-disposal pile disposal pile stability were undertaken using a specially constructed shear box. Layering the coal reject with clay tailings creates a semi-permeable barrier, which acts to restrict water percolation through the reject as well as reacting with the leachate to increase the leachate to increase the leachate pH and absorb metals.]]