World Mineral Production covers the majority of economically important mineral commodities. For each commodity constant efforts are made to ensure that as many producing countries as possible are reported. For some commodities, where statistics on production are not publicly available, estimates are made. Users of this compilation are advised that more statistical information than can be included in a publication of this nature is held in the British Geological Survey files and is available for consultation. Historical data (from 1913 for many commodities) can be obtained from the predecessors to this series entitled World Mineral Statistics and the Statistical Summary of the Mineral Industry. Copies of these publications are available in the World Archive section of the website: www.mineralsUK.com. Source: www2.bgs.ac.uk/mineralsuk/statistics/worldStatistics.html