00000nam 2200000zi 4500 9.911506 CaOODSP 20221107182353 m o d f cr mn||||||||| 220517e198104##bccbf ob f000 0 eng d CaOODSP eng rda CaOODSP n-cn-bc En40-1033/1981E-PDF Hallam, R. L., author. Northair Mines Limited, Brandywine Falls, B.C. : notes from a review of aquatic environmental information, site inspection and water quality audits conducted June 20, 1978 and March 4, 1981 / by R.L. Hallam. West Vancouver, B.C. : Department of Environment, Environmental Protection Service, April, 1981. 1 online resource (iv, 66 pages) : maps, plates text txt rdacontent computer c rdamedia online resource cr rdacarrier Cover title. Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references (pages 38-40). "Northair Mines Ltd. a small 300 ton/day copper, gold, silver, lead and zinc mine located approximately 56 km due north of Squamish, B.C. opened in 1976 and is expected to close in late 1981 for the lack of economically recoverable ore. Two flotation concentrates (Cu-Pb & Zn) are produced and silver-gold are recovered by mercury amalgamation and refined to dore bars on site. Cyanide is used to differentially separate the two flotation concentrates"--Summary and recommendations, page 28. Mines and mineral resources Environmental aspects British Columbia. Mine water Quality British Columbia. Ressources minérales Aspect de l'environnement Colombie-Britannique. Eau de mine Qualité Colombie-Britannique. Canada. Environmental Protection Service, issuing body. PDF 9.31 MB https://publications.gc.ca/collections/collection_2022/eccc/en40/En40-1033-1981-eng.pdf