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Acid-Rock Drainage at Skytop, Centre County, Pennsylvania, 2004: Usgs Open-File Report 2005-1148 (en Inglés)
United U. S. Department of the Interior
(Autor)
·
Jane M. Hammarstrom
(Autor)
·
Bibliogov
· Tapa Blanda
Acid-Rock Drainage at Skytop, Centre County, Pennsylvania, 2004: Usgs Open-File Report 2005-1148 (en Inglés) - U. S. Department of the Interior, United ; Et Al ; Hammarstrom, Jane M.
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Reseña del libro "Acid-Rock Drainage at Skytop, Centre County, Pennsylvania, 2004: Usgs Open-File Report 2005-1148 (en Inglés)"
Recent construction for Interstate Highway 99 (I-99) exposed pyrite and associated Zn-Pb sulfide minerals beneath a >10-m thick gossan to oxidative weathering along a 40-60-m deep roadcut through a 270-m long section of the Ordovician Bald Eagle Formation at Skytop, near State College, Centre County, Pennsylvania. Nearby Zn-Pb deposits hosted in associated sandstone and limestone in Blair and Centre Counties were prospected in the past; however, these deposits generally were not viable as commercial mines. The pyritic sandstone from the roadcut was crushed and used locally as road base and fill for adjoining segments of I-99. Within months, acidic (pH1,000 mg/L), seep waters at the base of the cut contain >100 mg/L dissolved Zn and >1 mg/L As, Co, Cu, and Ni. Lead is relatively immobile (
