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Nanotesla
  International SI unit for measuring magnetic flux density.
 
Native gold
  Gold in its free state. Also called placer gold or free gold.
 
Native metal
  A metal occurring in nature in pure form, uncombined with other elements.
 
Natural ventilation
  Mine ventilation without the aid of fans or furnaces.
 
Newton (N)
  Unit of force equivalent to the force that produces an acceleration of one metre per second per second on a mass of one kilogram.
 
Non-metallic
  Containing little or no metal; industrial mineral.
 
Nonel
  Hollow plastic tube coated with a reactive explosive compound used to trigger explosions. No electric current is used.
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