Yucca Mountain is a ridge line in Nye County, in the south-central part of the U.S. state of Nevada. It is composed of volcanic material (mostly tuff) ejected from a now-extinct caldera-forming supervolcano. Yucca Mountain is most notable as the site of the proposed Yucca Mountain Repository, a U.S. Department of Energy terminal storage facility for spent nuclear reactor fuel and other radioactive waste.

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