Graph showing the moisture content and ash content of brown coal by percentage. Latrobe Valley has a low percentage of ash and a high moisture content. Neurath D, Germany has a mid range percentage of ash and approximately 60% moisture content. Puentes Spain has a 20-25% ash content and approximately 50% moisture content. Megalopolis Greece has a mid range ash content and a high moisture content. Dakota Texas U.S.A has approximately 10% ash content and approximately 30-40% moisture content. Ptolemais Greece has a long ranging ash content and approximately 60% moisture content. Indonesian Low Rank has a very low ash content and approximately 30-40% moisture content.