Carbonate-Hosted Massive Sulfide Deposits and Hypogene Speleogenesis: A Case Study from Nanisivik Zinc/Lead Mine Baffin Island, Canada

Nanisivik zinc/lead mine is located at Lat. 73°N in northwestern Baffin Island. The host rock is a pervasively dolomitized Proterozoic platform carbonate overlain by a shale aquitard. The principal deposit, the Main Ore, is of zinc, lead, and iron sulfide plus gangue minerals, chiefly secondary dolomite. It extends for 3 km along a horst and is terminated at both ends by modern valley entrenchments. The Main Ore body is consistently ~100 m wide …