Nanisivik Mine, Nanisivik, Baffin Island, Nunavut Territory, Canada

This is a Precambrian Mississippi Valley-type massive lead zinc sulfide deposit, hosted in carbonate rock, that was subsequently reworked. Almost all the marcasite pseudomorphed to pyrite. Blades, twins and even fivelings are now pyrite. The incredibly diverse forms of pyrite are unique to this locality. Owned by Nanisivik Mines, Ltd. and operated from 1976 to 2002.

References:
- Rocks & Minerals: 62: 115.
- Gait, R.I. et al. (1990): "Minerals of the Nanisivik mine Baffin Island Northwest Territories (Canada)." Mineralogical Record, 21(6), 515-534.
- Symons, D.T.A., Symons, T.B., and Sangster, T.F. (2000): Paleomagnetism of the Society Cliffs dolostone and the age of the Nanisivik zinc deposits, Baffin Island, Canada. Mineralium Deposita 35, 672-682.

- http://en.wikipedia.org/wiki/Nanisivik_Mine