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Uranium mined as an ore is the source of the fuel.
According to the United States Nuclear Regulatory Commission, nuclear fuel is from three different kinds of fuel. The special one consists of uranium-233, uranium-235, enriched uranium, or plutonium. The Source is from natural uranium or thorium. It can also come from depleted uranium not suitable as a reactor fuel. The byproduct can come from radioactive material. They also contain waste and tailings made by extracting or concentrating the uranium or thorium from an ore processed mainly for its content of source material.
We mine uranium for use as a nuclear fuel. The uranium is separated from ore, and may undergo enrichment to separate out the lighter U-235 nuclide from the heavier U-238 one.
Nuclear material for nuclear reactors are usually obtained from uranium. Uranium is obtained from uranium mines (open pit or underground mines) the same way mining for other minerals. Uranium then passes through different processes until getting it in a suitable form for fabrication into nuclear fuel.
Uranium ore is mined
Uranium ore.
By mining uranium ore
The uranium ore is mined
Uranium ore is not...uranium ore !
Uranium is used moreso because it is in fact NOT a fossil fuel. It is a heavy metal mined from an ore, and it's energy process is call nuclear fission.
Uranium is a non-renewable fuel. The earth has a limited supply of this mineral. Uranium ore is mined, then refined for use in power plants. It can not be put back. The earth is not creating more uranium. As with any non-renewable fuel, we should be concern about the supply. If additional quantities are discovered, the uranium that is known to us, can increase. See related link on abundance of uranium and other minerals.
1. Uranium must be refined to obtain "nuclear grade" uranium. 2. The enrichment in the isotope 235U depends on the type of the nuclear reactor; some reactors (as CANDU) work with natural uranium.