According to the latest surveys conducted by the BVK Bundesverband Kraftwerksnebenprodukte e. V [Federal Association for Power Station By-products], a total of around 4.1 million tonnes hard coal fly ash was sold in 2004, representing another increase of about 3.85 % over the 3.9 million tonnes sold the previous year. With 250,000 tonnes (plus 5.5 %) going into the construction of roads and foundations, and 787,000 tonnes (plus 37 %) to the mining indus-try or for dry construction materials, there were some substantial increases compared to the year before.