Geology and Sedimentary Origin of the Balmat-Edwards Zn-Pb Deposits in Northwestern New York State
Timothy C.O. Nixon
The Balmat-Edwards Zn-Pb district is found in the Northwestern New York lowland border region. It is a part of the Grenville metasedimentary and metavolcanic series, and has large deposits of sulfide minerals (sphalerite (ZnS), pyrite (FeS2), and galena (PbS2). The stratigraphy of the Grenville Series is a basal Hyde School Gneiss, Gouverneur Marble, Popple Hill Gneiss, and the Upper Marble. The area has been subjected to upper amphibolite-granulite facies metamorphism dated, most recently, at 1130 Ma.