Examlex
Determine the number of grams of copper present in a 4.0 kg sample of the mineral chalcopyrite (CuFeS2).
Depletable Resource
A natural resource that can be diminished by use, such as fossil fuels or minerals, which are not renewable over short time spans.
User Cost
The cost of using a good or service, including the actual price paid and other sacrifices (like time or effort).
Oil Reserves
Quantities of crude oil that are confirmed to be recoverable under current economic and operating conditions.
Hotelling Rule
A principle from the economics of non-renewable resource management suggesting that the net price of a resource should increase at the rate of interest over time to ensure efficient extraction and usage.
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