Which LCA material from the ecoinvent LCA-Database for the transformation of an Australien dessert area to a mine should I use? I can't find anything like a dessert in the datasets. Or should I just use transformation from unknown?
I think you'll be stuck using the unknown. For something like this I would suggest developing something custom, or look to incorporate newer spatial classification systems and impact assessment methods. See for instance classificaiton provided by Article Regionalized LCA in practice: the need for a universal shape...