Douglas Yager is a Geologist with the Geology, Geophysics, and Geochemistry Science Center.
Research Interests
Douglas Yager has extensive experience working in volcanic and mineralized terrain as part of abandoned mine lands investigations. Much of his USGS career has focused on the San Juan Mountains, in the southern Rocky Mountain volcanic field, Colorado, where he has worked on hydrothermally altered volcanic rocks that are host to precious- and base-metals extensively mined there since the late 1870’s. Doug has co-led several field trips and student field courses in the San Juan Mountains. His work on acid neutralizing capacity of propylitically altered lavas has aided in understanding possible alternative methods of mine land cleanup. His watershed approach to analyzing geologic parameters that control surface water and groundwater geochemistry helps to identify source areas for potential mineral deposits and can be used to prioritize and rank watersheds based on the severity of water quality impacts from mining-related and natural sources of acidity and metals to streams. He currently is a project co-leader for developing a 3-D geologic and geophysical model of the San-Juan and Silverton caldera complex in Silverton, Colorado.
Professional Experience
Geologist, U.S. Geological Survey, 1985–present
Education and Certifications
University College University of Denver, Certificate of Advanced Studies in GIS 1998
University of Colorado at Boulder, M.S. Geology 1995
Colorado State University, B.S. Geology, 1984
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
Nonmetallic Industrial Mineral Resources of the U.S.
Science and Products
- Science
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... - Data
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