Reclaimed flood plain and stream channel at former site of the Buckeye mill tailings, 2002. Cleanup efforts conducted in 2000-01 by the USDA Forest Service dramatically reduced erosion of metal-rich tailings in to Basin Creek

A view of Pinal Creek Valley, Ariz., (circa 1990s) showing mine workings, large waste pile, and encroaching development of Globe, Ariz.

A view of Pinal Creek Valley, Ariz., (circa 1900) showing mine workings and valley floor

Measuring the water chemistry of Pinal Creek, Ariz., the site of an investigation of the discharge of an acidic ground-water plume to the creek

Perennial reach of Pinal Creek, Ariz., where water from an acidic plume of ground water is discharged

Propane injection test used to quantitatively measure the degassing of dissolved gases from Pinal Creek, Ariz.

View of the setup of a NaCl tracer test that was designed to determine natural attenuation of metals in Pinal Creek, Ariz.

Downstream view of Pinal Creek, Ariz., where a tracer solution was injected into the stream during a tracer test. Water-quality sampling crews can be seen in the distance

MINIPOINT ground-water sampler used to measure metals attenuation in shallow streambed sediments

Discharge of treated water from a remediation system designed to treat a plume of acidic ground water, Pinal Creek, Ariz.

A view of the Arkansas River, Colo., in which the water chemistry and sediments have been affected by drainage from abandoned mine lands

Mine dump at St. Kevin Gulch, Colo., (Upper Arkansas River Watershed) the location of USGS research on the transport of metals in streams impacted by acid mine drainage