The annual change in the value of an in-ground mineral is equal to the increase or decrease of inventories ("reserves"), multiplied by the market value of a reserve unit. The limited shrinking resource base does not exist. Its inter-generational optimizing is a phantom problem. If there is any "Hotelling rent" it is captured by the reserve market value, which is created by investment in knowledge (exploration) and in productive facilities (development). There are problems of concepts and data. But examples for recent years suggest that mineral value changes are small.
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