Meet our Team

Dr. Andy Robertson has a B.Sc. in Civil Engineering, a Ph.D. in Rock Mechanics and over 30 years of experience in mining geotechnics and environmental engineering. His experience includes periods of work with a mining company and specialist foundation construction contractor, providing him with practical field experience. In the 27 years he spent as one of the three senior principals of Steffen, Robertson & Kirsten and as the president of Robertson GeoConsultants Inc., he has been responsible for the development of the mining geotechnical and environmental engineering practices in the areas of:

He has been the lead investigator and/or designer for numerous project teams for mining companies and provides review and senior evaluation and counseling to a number of mining companies, research establishments, professional associations and provincial, state and federal agencies. Dr. Robertson participates on numerous technical review boards for mining companies and regulatory authorities. He has published extensively, participated in the drafting of numerous technical guides currently used by industry and regulatory bodies alike, and has been the recipient of a number of technical and industry awards. Today Dr. Robertson continues his practice as corporate consultant to the international mining industry, with focus on participation in several Technical Review Boards for tailings and mine waste facilities.


Dr. Christoph Wels has a B.Sc. in Hydrology, a M.Sc. in Watershed Ecosystem Studies and a Ph.D. in Hydrogeology with over 20 years of professional experience in academic research and consulting. He has published several scientific papers in the areas of contaminant hydrogeology and watershed hydrology. Dr. Wels is President and Senior Hydrogeologist with Robertson GeoConsultants Inc. and specializes on groundwater modeling and evaluating the impact of mining projects on groundwater resources. He joined Robertson GeoConsultants in 1995 and has since been consulting to the mining and environmental industry in the areas of:

As senior hydrogeologist of RGC, he is responsible for all aspects of hydrogeological investigations from field work to detailed groundwater flow and transport modeling. His fluency in English, Spanish and German allows direct communication with clients and regulatory agencies all over the world.



Jack Caldwell, P.Eng, has a B.Sc. in Civil Engineering, an M.Sc. (Eng.) in Geotechnical Engineering and a post-graduate law degree. He has over 35 years engineering experience on mining, civil, geotechnical and site remediation projects. He has worked on numerous projects throughout southern Africa, Europe, Canada and the United States. His project experience includes:

In addition, Mr. Caldwell has been the lead specialist for various geotechnical and civil engineering projects in Southern California. Mr. Caldwell has written many engineering reports, proposals, and technical papers. He is the lead author of the book, Principles and Practice of Waste Encapsulation, on the design of waste disposal facilities for radioactive and hazardous wastes.


Dr. Paul Ferguson completed his Ph.D. in Earth Sciences in 2007 with a focus on isotope and trace element geochemistry. He has fifteen years of experience in the fields of environmental geochemistry and hydrogeology and specializes in characterizing the impacts of acid rock drainage (ARD) and metal leaching (ML) on groundwater and surface water quality and the determining the implications for mine closure.

Paul has worked closely with regulatory agencies, mining companies, and other consulting firms during the pre-feasibility, active mining, and closure stages of mining projects in Canada, Chile, and Australia so is well-versed in the permitting process & required regulatory interface during various stages of mining.

Paul is RGC’s project lead for closure planning at Nyrstar Myra Falls in western Canada and at the former Rum Jungle Mine Site, an abandoned uranium mine in Australia’s Northern Territory. He has also worked at the former Mount Morgan Mine Site in Queensland (Australia) and the Faro Mine Site in Canada’s Northwest Territories, as well as on several active mines in northern Canada and Chile.     

He joined Robertson GeoConsultants in 2008 and has been a consultant to the mining and environmental industry in the areas of:


Dr. Mahmoud Hussein has a B.Sc. in Civil Engineering, an M.Sc. (Eng.) in Groundwater Modelling and a Ph.D. in Hydrogeology. Mahmoud joined Robertson GeoConsultants Inc. in 2016 as a hydrogeologist and groundwater modeler. He has over 14 years of consultancy and research experience in the areas of:

  • Groundwater flow and solute transport modelling,
  • Aquifer storage and recovery testing,
  • Design, implementation, supervision and interpretation of hydrogeological investigations,
  • Analysis of aquifer and well performance testing, and
  • Time series analysis applied to borehole water levels response to natural and anthropogenic influences.


Tara Raketti has a B.Sc. in Environmental Engineering and in Biology and has nine years of professional experience in mining hydrogeology and environmental analyses. Tara joined Robertson GeoConsultants Inc. in 2013

Tara’s technical experience includes supervision of both Dual-Rotary and Sonic drilling, well construction and development, and hydraulic testing and analysis. She has managed large multi-year drilling programs with budgets exceeding US$ 1 million. Tara has also managed her own water quality sampling programs and is well-practiced in groundwater and surface water sampling. Additionally, she has developed water and load balance models, both in Excel and GoldSim, to support mine closure planning. 


Alex Trapp has a M.Sc. in Water Resources Engineering and Management and a B.Eng. in Civil Engineering. He has eight years of professional experience in mining hydrogeology and environmental analyses. Alex joined Robertson GeoConsultants Inc. in 2012 as a Water Resources Engineer and again in 2016.

His technical experience includes planning and supervision of drilling programs, hydraulic testing, well installation, and water quality sampling. Alex also has experience in numerical groundwater flow and transport modeling ranging from 1D models for seawater intrusion and seepage analysis to large, complex 3D models in support of mine water management. Furthermore, he has experience in reviewing geotechnical testing and finite strain consolidation modelling for tailings seepage analysis.


Petr Kuranov has a B.Sc. and a M.Sc. in Hydrogeology. He has over 10 years of professional experience on mining, civil and site remediation projects. Petr has joined Robertson GeoConsultants Inc. in 2019 as a hydrogeologist and groundwater modeler.

Petr has been involved in numerous projects for oil and gas and mining clients throughout Western Canada, in South America, Europe and Western Asia. His areas of expertise include:

  • Numerical modeling of groundwater flow, solute transport and surface water-groundwater interaction processes,
  • Planning and supervision of hydrogeological field programs,
  • Hydraulic tests interpretation,
  • Hydrogeological data visualization and analyses, and
  • Geological modeling.


Cristobal Vargas has a M.Sc. in Hydrogeology and Environmental Engineering and a B.Eng. in Civil Engineer with specialization in Hydraulic, Environmental and Sanitary Engineering. Cristobal has five years of professional and research experience in the field of groundwater modeling and joined Robertson GeoConsultants Inc. in 2019 as a Groundwater Modeler.

Cristobal's technical experience includes saturated and unsaturated groundwater flow modeling, solute transport modeling and reactive transport modeling. Furthermore, he has experience in the analysis of hydraulic testing, and hydrological information to model the interaction between surface water and groundwater.


Dr. Mina Seyedali completed her Ph.D. in Earth and Ocean Sciences in 2020 with a focus on use of stable isotopes and trace metals in understanding evolution of paleo-seawater chemistry. Mina has an M.Sc. and B.Sc. in Mining Exploration Engineering with special focus on use of geostatistical techniques in exploration of ore deposits. Mina joined Robertson GeoConsultants Inc. in 2021 as a consultant in geochemistry. She has ten years of research experience in areas of:

  • Low-temperature hydrothermal systems active in oceanic crust,
  • Designing experiments, running, and interpreting result of various analytical instruments (e.g., ICP-MS, XRD, SEM), and
  • Implementing predictive models, data processing and visualization.

Arturo Velasco has a B.Eng and M.Sc. in Hydraulic Engineering and Environment with a specialization in water resources analysis. He has six years of professional and research experience in water resources and remote sensing environmental applications. Arturo joined Robertson GeoConsultants Inc. in 2021 as a Hydrology Consultant.

Arturo’s experience includes the construction of numerical models as well as the interpretation and analysis of results in water-related projects. He also has experience in the processing and application of remote sensing techniques using spaceborne and airborne data for water resources analysis.

  • Hydrological and hydraulic modeling,
  • Geographic information system and geospatial analysis, and
  • Remote sensing (optical and radar sensors)

Larisa Remizov has a M.Sc. in Geophysics, and over 20 years of professional experience in the mineral resources exploration in Canada and overseas and GIS Industry. She has a wide range of experience in Project Management, GIS and Digital Mapping Technologies. She has directed and coordinated all aspects of spatial projects, including:

  • The design and execution of workflow procedures,
  • The database setting and management, data specifications,
  • The development and application of quality control procedures, and
  • Preparation of GIS maps, cross-sections and 3D modeling.
She has advanced knowledge of ESRI, CAD and other Spatial Data handling software modules. She is a member of the Association of Professional Engineers and Geoscientists of BC, Canada (P.Geo) since 2002.