The mineralized zone in Grenville paragneisses has sphalerite, galena, chalcopyrite, and sulphides of iron with a gangue of skarn or cordierite and anthophyllite. The skarn is developed near and in limestone and passes by a series of transitional mineral associations into the cordierite-anthophyllite rocks developed in the absence of limestone. The structure of the limestones had an important role in determining the positions of the orebodies.

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