The Mineralogy of a Silver-Rich Area in the Edwards Zinc-Lead Mine, New York
The ore of the zinc-lead deposits of the Balmat-Edwards district in northern New York is known to be composed of very coarse-grained massive sulfides, mainly sphalerite, galena and pyrite. Typically the galena contains small amounts of silver, presumably in solid solution. Galena concentrates (6090 lead) contain an average of 514 grams of silver per tonne. An unusual silver-rich zinc-lead ore pocket at the Edwards mine contains nearly 190 silver. Ore microscopy shows that this ore is characterized by abundant, relatively fine-grained chalcopyrite with anhedral pyrite inclusions. Fine-grained sphalerite, native silver, argentite, freibergite and arsenopyrite occur in association with chalcopyrite as fracture-fillings in calcite. Electron-microprobe analyses indicate that freibergite contains up to 25.8% silver, with an average composition of Cu1.67Ag1.26Sb9.96As9.22S3.25. The amounts of the silver minerals at the Edwards mine do not warrant recovery.
C. R. Serviss et al., "The Mineralogy of a Silver-Rich Area in the Edwards Zinc-Lead Mine, New York," Canadian Mineralogist, vol. 24, no. 2, pp. 239-245, Mineralogical Association of Canada, Jun 1986.
Geosciences and Geological and Petroleum Engineering
Keywords and Phrases
Lead Deposits - New York; Silver Deposits - New York, Edwards Mine; Silver Minerals; Zinc-Lead Ore; Zinc Deposits; Ore Microscopy; Massive Sulfide
International Standard Serial Number (ISSN)
Article - Journal
© 1986 Mineralogical Association of Canada, All rights reserved.
01 Jun 1986