Article 13 ( 6 ) requires " the concentration of weak acid dissociable cyanide in the pond is reduced to the lowest possible level using best available techniques ", and at most all mines started after 1 May 2008 may not discharge waste containing over 10ppm WAD cyanide, mines built or permitted before that date are allowed no more than 50ppm initially, dropping to 25ppm in 2013 and 10ppm by 2018.
