The reserve base includes those resources that are currently economic (reserves), marginally economic (marginal reserves), and some of those that are currently subeconomic (subeconomic resources)."
Reservebaserne omfatter de ressourcer, der i øjeblikket er økonomiske (reserver), marginalt økonomiske (marginalreserver) og nogle af de der i øjeblikket er subøkonomiske (subøkonomiske ressourcer)."