Tim Bayley, Ph.D.
Vice President / Principal Hydrogeologist
Technical Assurance Manager
Areas of Specialization
Probabilistic Modeling
Applied Statistics
Numerical Modeling
Conceptual Models
Aquifer Testing
Tim is a Vice President at M&A, where he leads the firm’s technical assurance program. In that role he oversees the quality and defensibility of M&A’s work across the western United States, Chile, and Argentina. His background as a groundwater modeler shapes how he approaches complex sites: build a sound conceptual model, test it rigorously against field data, and carry it through to decisions that hold up to regulatory and stakeholder scrutiny. Particular technical interests of Tim’s include uncertainty analysis, decision making under uncertainty, saturated/unsaturated flow systems, and watershed management.
Tim has led major mining projects across the full range of mine water challenges, including site characterization, dewatering, water supply, tailings, permitting (NEPA, APP, etc.), stakeholder engagement, and monitoring and mitigation of impacts to groundwater. He integrates field investigations, geophysics, and numerical modeling to support mine planning, design, and permit approval for operations at every stage of development. Representative clients include Resolution Copper, Freeport McMoran, BHP, South32, and ASARCO. In addition to mining, Tim has supported a wide range of other clients throughout his career such as water districts, NGOs, and power companies.
As a senior leader at M&A, Tim is also involved in management of the firm’s professional staff and business operations.

Qualifications
At A Glance
Experience since 2007
Ph.D., Hydrology & Water Resources
University of Arizona
M.S., Watershed Hydrology
University of Arizona
B.S., Geology
Wheaton College
Selected Publications & Community Involvement
M&A uses GoldSim software to support decision making in water supply projects
Challenging a paradigm: what we learned by comparing three common groundwater sampling methods
What does the EPA’s new Coal Combustion Residuals Rule mean for power generators?
Subject area expert for the Initiative for Responsible Mining Assurance (IRMA)

