UN Environment International Resource Panel Global Material Flows Database
Data on metal ore extraction: As primary sources mainly report the majority of the different metal types in metal content contained in the extracted ore, factors are applied to calculate the corresponding extraction of gross ore (run of mine). Most of these factors are national, regional or global averages and not time-specific, wherefore in some cases incosistencies with reported gross ore values might exist. Furthermore all data on grazing of livestock and fodder production as well as parts of the data on extraction of minerals for construction purposes are estimated. More information on these issues can be found in the technical report: www.csiro.au/~/media/LWF/Files/CES-Material-Flows_db/Technical-annex-for-Global-Material-Flows-Database.pdf
UN Environment, 2018. Global Material Flows Database. Accessed through Resource Watch, [date]. www.resourcewatch.org.