Western view toward the Red Mountains near Silverton, Colorado, taken just upstream from the North Fork Cement Creek drainage in 2006. The photo illustrates acidic drainage (red drainage at right) and less acidic drainage (white drainage at left of photo) that originates from altered rocks and mines in the watershed.
Douglas B Yager (Former Employee)
Science and Products
A Shallow to Deep View Inside the Hydrothermally Altered and Mineralized Silverton Caldera Complex: New Geologic Insights Gained From Modern Geophysical Interpretations
The Silverton caldera complex in southwest Colorado hosts base and precious metals that have been mined since the late 1800s. Extensive mine workings, excellent bedrock exposures, and deeply incised drainages make this area a natural laboratory ideally suited for furthering our understanding of the mineral systems in a volcanic environment. In addition, state-of-the-art geophysical data processing...
Nonmetallic Industrial Mineral Resources of the U.S.
In 2012, this project initiated a multi-year effort to characterize domestic nonmetallic industrial mineral resources that are important for national infrastructure, agriculture, and energy development. Activities included (1) a national-scale compilation of production data, providing a snapshot of the nonmetallic industrial mineral deposits that were of significance through the 20th century and...
Ross basin, upper Cement Creek in Watershed above North Fork Cement Creek
Western view toward the Red Mountains near Silverton, Colorado, taken just upstream from the North Fork Cement Creek drainage in 2006. The photo illustrates acidic drainage (red drainage at right) and less acidic drainage (white drainage at left of photo) that originates from altered rocks and mines in the watershed.
Panorama of Silverton, Colorado
Panoramic photo of Silverton, Colorado, with Sultan Mountain in the distance. Silverton is the town most directly affected by the Gold King mine blowout.
Panoramic photo of Silverton, Colorado, with Sultan Mountain in the distance. Silverton is the town most directly affected by the Gold King mine blowout.
Ferricrete Formation at Base of Cement Creek
Ferricrete (surficial deposits cemented by iron oxides) formation at the base of Cement Creek north of Silverton, Colorado.
Ferricrete (surficial deposits cemented by iron oxides) formation at the base of Cement Creek north of Silverton, Colorado.
Cement Creek Following Storm Event
Cement Creek following storm event in July, 2004. Note the orange discoloration of the stream derived from weathering of bedrocks and from mined areas. This type of event happens frequently in the Animas Watershed near Silverton, Colorado. View is to the south, with Kendall Mountain in the distance.
Cement Creek following storm event in July, 2004. Note the orange discoloration of the stream derived from weathering of bedrocks and from mined areas. This type of event happens frequently in the Animas Watershed near Silverton, Colorado. View is to the south, with Kendall Mountain in the distance.
Brown's Gulch Below Brooklyn Mine near Silverton, Colorado
USGS scientist measuring pH, Specific Conductance and dissolved oxygen in a remediation ditch constructed with local volcanic rock possessing some acid neutralizing capacity.
Brown's Gulch is below the Brooklyn Mine, a few miles north of Siverton, Colorado, in the Mineral Creek basin.
USGS scientist measuring pH, Specific Conductance and dissolved oxygen in a remediation ditch constructed with local volcanic rock possessing some acid neutralizing capacity.
Brown's Gulch is below the Brooklyn Mine, a few miles north of Siverton, Colorado, in the Mineral Creek basin.
Science and Products
A Shallow to Deep View Inside the Hydrothermally Altered and Mineralized Silverton Caldera Complex: New Geologic Insights Gained From Modern Geophysical Interpretations
The Silverton caldera complex in southwest Colorado hosts base and precious metals that have been mined since the late 1800s. Extensive mine workings, excellent bedrock exposures, and deeply incised drainages make this area a natural laboratory ideally suited for furthering our understanding of the mineral systems in a volcanic environment. In addition, state-of-the-art geophysical data processing...
Nonmetallic Industrial Mineral Resources of the U.S.
In 2012, this project initiated a multi-year effort to characterize domestic nonmetallic industrial mineral resources that are important for national infrastructure, agriculture, and energy development. Activities included (1) a national-scale compilation of production data, providing a snapshot of the nonmetallic industrial mineral deposits that were of significance through the 20th century and...
Ross basin, upper Cement Creek in Watershed above North Fork Cement Creek
Western view toward the Red Mountains near Silverton, Colorado, taken just upstream from the North Fork Cement Creek drainage in 2006. The photo illustrates acidic drainage (red drainage at right) and less acidic drainage (white drainage at left of photo) that originates from altered rocks and mines in the watershed.
Western view toward the Red Mountains near Silverton, Colorado, taken just upstream from the North Fork Cement Creek drainage in 2006. The photo illustrates acidic drainage (red drainage at right) and less acidic drainage (white drainage at left of photo) that originates from altered rocks and mines in the watershed.
Panorama of Silverton, Colorado
Panoramic photo of Silverton, Colorado, with Sultan Mountain in the distance. Silverton is the town most directly affected by the Gold King mine blowout.
Panoramic photo of Silverton, Colorado, with Sultan Mountain in the distance. Silverton is the town most directly affected by the Gold King mine blowout.
Ferricrete Formation at Base of Cement Creek
Ferricrete (surficial deposits cemented by iron oxides) formation at the base of Cement Creek north of Silverton, Colorado.
Ferricrete (surficial deposits cemented by iron oxides) formation at the base of Cement Creek north of Silverton, Colorado.
Cement Creek Following Storm Event
Cement Creek following storm event in July, 2004. Note the orange discoloration of the stream derived from weathering of bedrocks and from mined areas. This type of event happens frequently in the Animas Watershed near Silverton, Colorado. View is to the south, with Kendall Mountain in the distance.
Cement Creek following storm event in July, 2004. Note the orange discoloration of the stream derived from weathering of bedrocks and from mined areas. This type of event happens frequently in the Animas Watershed near Silverton, Colorado. View is to the south, with Kendall Mountain in the distance.
Brown's Gulch Below Brooklyn Mine near Silverton, Colorado
USGS scientist measuring pH, Specific Conductance and dissolved oxygen in a remediation ditch constructed with local volcanic rock possessing some acid neutralizing capacity.
Brown's Gulch is below the Brooklyn Mine, a few miles north of Siverton, Colorado, in the Mineral Creek basin.
USGS scientist measuring pH, Specific Conductance and dissolved oxygen in a remediation ditch constructed with local volcanic rock possessing some acid neutralizing capacity.
Brown's Gulch is below the Brooklyn Mine, a few miles north of Siverton, Colorado, in the Mineral Creek basin.