Production sharing cannot be applied to mining. Mining should be given special preference. In some instances, ore-bodies should be taxed on an individual basis. This should be done only for major projects. The largest challenge in tax today is how to handle tax treatment of reclamation costs.
Stability is a key feature.
Such studies are very useful as a means for policymakers to understand how competitive their tax system is. However, information in such studies must be carefully balanced against other factors that influence investment. In theory this seems like a good goal from a government perspective. However in practice it could lead to an enticement for companies to use creative bookkeeping to avoid higher rates, and may be too complex for governments to effectively monitor and enforce. This is an important factor.