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This also depends on the available technology for both finding the metal ores as well as extracting them, which is constantly changing.If the technology or demand changes, vast amounts of metal previously ignored can become economically extractable.Earth minerals and metal ores, fossil fuels (coal, petroleum, natural gas) and groundwater in certain aquifers are all considered non-renewable resources, though individual elements are almost always conserved.
Uranium, the most common fission fuel, and is present in the ground at relatively low concentrations and mined in 19 countries. This mined uranium is used to fuel energy-generating nuclear reactors with fissionable uranium-235 which generates heat that is ultimately used to power turbines to generate electricity. Renewable energy and energy efficiency are no longer niche sectors that are promoted only by governments and environmentalists.
A non-renewable resource (also called a finite resource) is a resource that does not renew itself at a sufficient rate for sustainable economic extraction in meaningful human time-frames.