If you have any knowledge about clinker kilns of 1000 to 1400tpd capacity being in operation today and being part of a system including precalciner. The question would be if you consider to be feasible to upgrade a 600tpd long dry kiln to an approx 1200tpd, modern precalciner kiln. What do you think an investment for such an upgrade would be like, in USD? What would be your closest estimation for such a work?