The steep valley at the confluence of Clipper and Little Clipper Creeks contains an estimated 268,000 m3 of tailings [44, 45], and is called the "deposition area".
Between 2010 and 2012, a World Bank-led venture moved one of the most precarious of Mailuu-Suu's 23 tailings dumps to safer ground and reburied it, at a cost of $8.4m£5.3m3m).
The APP level at pH < 6.3 was estimated considering that each Spercentt requires for neutralization 31.25 kg CaCO3 t-1 tailings.
Tailings from the Brazesti impoundment does not represent an ARD source as shows the positive NNP determined by a content of 97 kg CaCO3 t-1 tailings in excess compared with the required stoichiometric amount.
Till 2012, China has accumulated more than 12,000 tailings impoundments, 3000 of which are with a volume greater than 106 m3.
Samples were collected from a highly instrumented one-year mesocosm study that included the following treatments: 1) unamended tailings control; 2) tailings amended with 15% compost; and 3) the 15% compost-amended tailings planted with Atriplex lentiformis.
The results can be used to guide the construction and ensure the safety of No. 4 tailings dam or other high tailings dams.
During the time period covered in this study (1998-2002) tandings and waste rock covered about 8 acres of the mine property.
Currently in China there are more than 12,000 tailings impoundments and almost 95% of them use the upstream method for the construction of the dam.
Through high pressure oedometer-undrained triaxial tests and dynamic triaxial tests, researches were conducted on the static and dynamic strength characteristics of the tailings silty sand of No. 4 tailings reservoir in De-xing copper mine.
Table 6 Mixture recipe adopted in Case Study 3. Cement type Cement content (wt%) W/C ratio Tailings type Sulphur content of tailings (wt%) Portland cement type I 3, 4.5, and 6 12, 8, and 6 Tailings from metal mine 16 wt% weight percentage of cement to total solid weight; W/C ratio water-to-cement ratio.
