Terri A. Zach

I am a Physical Scientist at the U.S. Geological Survey, specializing in critical mineral assessments. My work primarily involves the use of GIS tools to georeference and digitize historical geologic maps, preserving these invaluable resources and enhancing their accessibility for modern geologic mapping endeavors. These maps are crucial for accurately locating historic mines and identifying critical mineral resources when compiling site locations for critical mineral assessments. Additionally, I model the grade and tonnage of critical minerals in areas with past or active production.

I earned my undergraduate degree at William & Mary, where I worked with Dr. Christopher M. Bailey on an honors thesis focused on a mélange unit in central Piedmont, Virginia. My research delves into geologically significant areas, aiming to unravel Earth’s intricate history with a specific focus on bedrock mapping. Key questions guiding my exploration include: How has the landscape evolved over time? What structural evidence sheds light on the area’s geologic history? When did tectonic events occur, and to what extent did they impact the rocks (including depth and temperature)?

I also collaborated with Dr. Ryan Thigpen in the Earth & Environmental Sciences Department at the University of Kentucky, Lexington, focusing on the topographic and geologic evolution of the Teton Range in Wyoming. The goal of my work is to produce high-resolution maps that aid in assessing geologic hazards and economic resources.