Distribution and partitioning of copper, lead and zinc in stream sediments above and below an abandoned mining and milling area near Pecos, New Mexico, USA

A reconnaissance study of base metals and mercury in stream sediments from along the Pecos River from North-eastern to South-eastern New Mexico showed elevated levels of copper, lead and zinc at two areas: below an abandoned mine waste dump and below an inactive mill. Zinc was also present at elevated levels in the area of a fish hatchery. During subsequent sampling trips, stream-sediment samples were collected from tributaries as well as the main stem of the river from the Pecos Wilderness boundary south to Villanueva State Park, a distance of approximately 88 km. Sediments were sieved to obtain the 2 mm to 63 µm and