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Tailings
wastes from the milling process; usually in slurry form

Time scale, geologic
a system if division of all geologic time into eras, periods, and epochs, based on biologic and physical events

Treaty on the Non-Proliferation of Nuclear Weapons (NPT)
an agreement signed in 1968 that prohibits:
  • transfer of nuclear weapons or other nuclear explosive devices form countries with nuclear weapon technology to countries without this technology
  • offering encouragement or assistance to a non-nuclear weapon country to manufacture such weapons or devices
  • receipt or manufacture of nuclear weapons by non-nuclear weapon countries

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