Philip L Verplanck
Philip Verplanck is a Research Geologist with the Geology, Geophysics, and Geochemistry Science Center.
Science and Products
Filter Total Items: 84
Development of a new toxic-unit model for the bioassessment of metals in streams Development of a new toxic-unit model for the bioassessment of metals in streams
Two toxic-unit models that estimate the toxicity of trace-metal mixtures to benthic communities were compared. The chronic criterion accumulation ratio (CCAR), a modification of biotic ligand model (BLM) outputs for use as a toxic-unit model, accounts for the modifying and competitive influences of major cations (Ca2+, Mg2+, Na+, K+, H+), anions (HCO3−, CO32−,SO42−, Cl−, S2−) and...
Authors
Travis S. Schmidt, W.H. Clements, K.A. Mitchell, Stanley E. Church, Richard B. Wanty, David L. Fey, Philip L. Verplanck, Carma A. San Juan
Estimating natural background groundwater chemistry, Questa molybdenum mine, New Mexico Estimating natural background groundwater chemistry, Questa molybdenum mine, New Mexico
This 2 1/2 day field trip will present an overview of a U.S. Geological Survey (USGS) project whose objective was to estimate pre-mining groundwater chemistry at the Questa molybdenum mine, New Mexico. Because of intense debate among stakeholders regarding pre-mining groundwater chemistry standards, the New Mexico Environment Department and Chevron Mining Inc. (formerly Molycorp) agreed...
Authors
Phillip L. Verplanck, D. Kirk Nordstrom, Geoffrey S. Plumlee, Bruce M. Walker
Questa Baseline and Pre-mining Ground-Water Quality Investigation, 7. A Pictorial Record of Chemical Weathering, Erosional Processes, and Potential Debris-flow Hazards in Scar Areas Developed on Hydrothermally Altered Rocks Questa Baseline and Pre-mining Ground-Water Quality Investigation, 7. A Pictorial Record of Chemical Weathering, Erosional Processes, and Potential Debris-flow Hazards in Scar Areas Developed on Hydrothermally Altered Rocks
Erosional scar areas developed along the lower Red River basin, New Mexico, reveal a complex natural history of mineralizing processes, rapid chemical weathering, and intense physical erosion during periodic outbursts of destructive, storm-induced runoff events. The scar areas are prominent erosional features with craggy headwalls and steep, denuded slopes. The largest scar areas...
Authors
Geoffrey S. Plumlee, Steve Ludington, Kirk R. Vincent, Philip L. Verplanck, Jonathan S. Caine, K. Eric Livo
Geochemistry of standard mine waters, Gunnison County, Colorado, July 2009 Geochemistry of standard mine waters, Gunnison County, Colorado, July 2009
In many hard-rock-mining districts water flowing from abandoned mine adits is a primary source of metals to receiving streams. Understanding the generation of adit discharge is an important step in developing remediation plans. In 2006, the U.S. Environmental Protection Agency listed the Standard Mine in the Elk Creek drainage basin near Crested Butte, Colorado as a superfund site...
Authors
Philip L. Verplanck, Andrew H. Manning, Jeffrey T. Graves, R. Blaine McCleskey, Todor I. Todorov, Paul J. Lamothe
U.S. Geological Survey research in Handcart Gulch, Colorado—An alpine watershed with natural acid-rock drainage U.S. Geological Survey research in Handcart Gulch, Colorado—An alpine watershed with natural acid-rock drainage
Handcart Gulch is an alpine watershed along the Continental Divide in the Colorado Rocky Mountain Front Range. It contains an unmined mineral deposit typical of many hydrothermal mineral deposits in the intermountain west, composed primarily of pyrite with trace metals including copper and molybdenum. Springs and the trunk stream have a natural pH value of 3 to 4. The U.S. Geological...
Authors
Andrew H. Manning, Jonathan S. Caine, Philip L. Verplanck, Dana J. Bove, Katherine G. Kahn
Naturally acidic surface and ground waters draining porphyry-related mineralized areas of the Southern Rocky Mountains, Colorado and New Mexico Naturally acidic surface and ground waters draining porphyry-related mineralized areas of the Southern Rocky Mountains, Colorado and New Mexico
Acidic, metal-rich waters produced by the oxidative weathering and resulting leaching of major and trace elements from pyritic rocks can adversely affect water quality in receiving streams and riparian ecosystems. Five study areas in the southern Rocky Mountains with naturally acidic waters associated with porphyry mineralization were studied to document variations in water chemistry and...
Authors
P. L. Verplanck, D. Kirk Nordstrom, D. J. Bove, G.S. Plumlee, R.L. Runkel
Science and Products
Filter Total Items: 84
Development of a new toxic-unit model for the bioassessment of metals in streams Development of a new toxic-unit model for the bioassessment of metals in streams
Two toxic-unit models that estimate the toxicity of trace-metal mixtures to benthic communities were compared. The chronic criterion accumulation ratio (CCAR), a modification of biotic ligand model (BLM) outputs for use as a toxic-unit model, accounts for the modifying and competitive influences of major cations (Ca2+, Mg2+, Na+, K+, H+), anions (HCO3−, CO32−,SO42−, Cl−, S2−) and...
Authors
Travis S. Schmidt, W.H. Clements, K.A. Mitchell, Stanley E. Church, Richard B. Wanty, David L. Fey, Philip L. Verplanck, Carma A. San Juan
Estimating natural background groundwater chemistry, Questa molybdenum mine, New Mexico Estimating natural background groundwater chemistry, Questa molybdenum mine, New Mexico
This 2 1/2 day field trip will present an overview of a U.S. Geological Survey (USGS) project whose objective was to estimate pre-mining groundwater chemistry at the Questa molybdenum mine, New Mexico. Because of intense debate among stakeholders regarding pre-mining groundwater chemistry standards, the New Mexico Environment Department and Chevron Mining Inc. (formerly Molycorp) agreed...
Authors
Phillip L. Verplanck, D. Kirk Nordstrom, Geoffrey S. Plumlee, Bruce M. Walker
Questa Baseline and Pre-mining Ground-Water Quality Investigation, 7. A Pictorial Record of Chemical Weathering, Erosional Processes, and Potential Debris-flow Hazards in Scar Areas Developed on Hydrothermally Altered Rocks Questa Baseline and Pre-mining Ground-Water Quality Investigation, 7. A Pictorial Record of Chemical Weathering, Erosional Processes, and Potential Debris-flow Hazards in Scar Areas Developed on Hydrothermally Altered Rocks
Erosional scar areas developed along the lower Red River basin, New Mexico, reveal a complex natural history of mineralizing processes, rapid chemical weathering, and intense physical erosion during periodic outbursts of destructive, storm-induced runoff events. The scar areas are prominent erosional features with craggy headwalls and steep, denuded slopes. The largest scar areas...
Authors
Geoffrey S. Plumlee, Steve Ludington, Kirk R. Vincent, Philip L. Verplanck, Jonathan S. Caine, K. Eric Livo
Geochemistry of standard mine waters, Gunnison County, Colorado, July 2009 Geochemistry of standard mine waters, Gunnison County, Colorado, July 2009
In many hard-rock-mining districts water flowing from abandoned mine adits is a primary source of metals to receiving streams. Understanding the generation of adit discharge is an important step in developing remediation plans. In 2006, the U.S. Environmental Protection Agency listed the Standard Mine in the Elk Creek drainage basin near Crested Butte, Colorado as a superfund site...
Authors
Philip L. Verplanck, Andrew H. Manning, Jeffrey T. Graves, R. Blaine McCleskey, Todor I. Todorov, Paul J. Lamothe
U.S. Geological Survey research in Handcart Gulch, Colorado—An alpine watershed with natural acid-rock drainage U.S. Geological Survey research in Handcart Gulch, Colorado—An alpine watershed with natural acid-rock drainage
Handcart Gulch is an alpine watershed along the Continental Divide in the Colorado Rocky Mountain Front Range. It contains an unmined mineral deposit typical of many hydrothermal mineral deposits in the intermountain west, composed primarily of pyrite with trace metals including copper and molybdenum. Springs and the trunk stream have a natural pH value of 3 to 4. The U.S. Geological...
Authors
Andrew H. Manning, Jonathan S. Caine, Philip L. Verplanck, Dana J. Bove, Katherine G. Kahn
Naturally acidic surface and ground waters draining porphyry-related mineralized areas of the Southern Rocky Mountains, Colorado and New Mexico Naturally acidic surface and ground waters draining porphyry-related mineralized areas of the Southern Rocky Mountains, Colorado and New Mexico
Acidic, metal-rich waters produced by the oxidative weathering and resulting leaching of major and trace elements from pyritic rocks can adversely affect water quality in receiving streams and riparian ecosystems. Five study areas in the southern Rocky Mountains with naturally acidic waters associated with porphyry mineralization were studied to document variations in water chemistry and...
Authors
P. L. Verplanck, D. Kirk Nordstrom, D. J. Bove, G.S. Plumlee, R.L. Runkel