Developed hydrogeologic conceptual model and numerical flow model for Diavik, an Arctic mine. Flow model included calibration to head data, gallery inflow data, tracer test data, and shut-in test data. The mine is located within a geologically-complex terrain comprised of volcanics and faulted granitic and metasedimentary deposits. An existing geologic model representing the current structural understanding was the basis for the numerical model. The flow model was used to represent alternate interpretations of faults. Initial results from the post-calibration period indicate that the model has been successful at predicting heads and head response at depths hundreds of meters deeper than the available data from calibration. Project included development of new methodology for spatial analysis and representation of the hydrogeologic interpretation coupled with the geologic/structural interpretation. Predictive modeling will allow for strategic dewatering design through the mine life. Subsequent data acquisition corroborated the predictive modeling results confirming that the structural geologic/hydrogeologic conceptualization, and the calibration were sufficiently accurate. Project included beta testing of new inverse method.
Trained mine personnel to use the ground water model for improved dewatering planning.
Evaluated potential streamflow impacts associated with a proposed gravel pit in Colorado Springs area.
Analyzed current data and re-calibrated flow models for multiple mine sites in Nevada and California. Data analysis activities included assessment of dewatering effects from exploration drilling, interpretation of recharge based upon mine surface features, and the incorporation of a pitlake package to simulate the hydraulic behavior of the ground water/surface water system in the vicinity of the pits. Data preparation and grid modifications included development of Fortran programs.
Selected and implemented a suite of analytical solutions to simulate pit dewatering during mining and pitlake recovery under two proposed closure alternatives for a mining site under permit review in California.
Performed hydraulic testing and analysis at a Newmont Gold site near Carlin, Nevada. Conducted packer testing to evaluate the permeability of a fractured formation associated with the ore zone for feasibility analysis of the hydrologic component of underground development. Worked under direction of Vladimir Straskraba, expert Hydrogeologist and in cooperation with Newmont Geologists and Engineers. This mine, Deep Star, was the first developed UG gold mine along the Carlin trend.
Updated numerical model for use as a water-management tool for a Battle Mountain Gold mine site in Nevada.
Participated in mineral resource evaluation of coalbed methane deposits in China. Responsibilities included fracture analysis, and selection and oversight of various testing procedures to determine confining pressures and stress fields contemporaneous with gas formation; and rank of the coal throughout the field (by ASTM methods).
Participated in numerous hydrogeologic characterizations at existing and proposed mining sites in Colorado, Utah, Nevada, Oregon, Montana, California and the Canadian Arctic.
Hydrogeologist responsible for drilling and installation of dewatering wells. Designed pilot scale pumping test and analyzed data for development of closure plan for Moab, Utah uranium mill tailings site in compliance with US Nuclear Regulatory Commission regulations.
Ground water modeler for fracture flow system in Sierra Nevada Mountains of California. Model was constructed and used for prediction of impacts resulting from the City of Los Angeles Metropolitan District Arrowhead East Tunnel Project. Model was also used to design effective mitigation through alternate grouting scenarios to limit impacts to springflow at San Manuel Band of Mission Indians site. Also assisted in fracture flow delineation and analysis for spatial parameter definition.
Field Hydrogeologist for drilling and evaluation of water supply for a Newmont mine.
Hydrogeologist responsible for characterization of baseline conditions for mine permitting activities at Atlas – Vale, OR; Newmont – Carlin, NV; Bull Mountain, MT; and gravel extraction sites in Colorado.
Thesis for Bachelor of Science in Geology, University of Vermont – mapped a gruesome portion of the western Sierra Nevada metamorphic belt.
Thesis for Master of Science in Hydrogeology, Colorado School of Mines – constructed and calibrated a flow model of the regional aquifer near the Louisiana Army Ammunitions Plant using MODFLOWP (inverse code). Performed contaminant fate and transport modeling with MT3D.
Collaborated with MAPTEK for improved visualization of hydrologic component in Vulcan.