The biggest challenge at present is that the workings are filling up with water, Western Basin is overflowing and Central Basin will overflow in 2012. The AMD is essentially ownerless as companies that operate today are new and, in the opinion of local mines, they cannot carry the burden. In the Western Basin, mining stopped in the 1990's. Workings are filled with water and AMD overflowed in 2002. Temporary treatment operations were put in place early in 2010 following the most recent decant. All the emergency measures provided by DWA have been exhausted.