Speakers
Fourth International Slope Stability in Mining Conference
27-29 October 2025 | Vancouver Convention Centre, Vancouver, Canada
Keynote Speakers

Scott Cylwik
Vice President / Geological Engineer
Call & Nicholas, Inc, USA
Scott has 18 years’ experience working as a geotechnical consultant for open pit mine slope stability. He earned his master of science in civil engineering from the University of California, Berkeley and his bachelor of science in geological engineering from the University of Arizona. Scott is a registered professional engineer in six American states. He has worked on over 200 open pit mine slope stability projects, on five continents. He has published research articles on rock mass shear strength, core orientation, anisotropic strengths, numerical modelling, probabilistic analysis, and experimental rock testing.
This study presents a database of over 900 large-scale drained triaxial tests that were used to calibrate and refine the Leps strength envelopes for rockfill materials. A novel non-linear shear strength criterion for rockfill is introduced which can replicate the Leps strength envelopes, is derived in terms of both shear/normal and principal stresses, employs a single fitting parameter with direct physical significance, and allows for smooth transitions between rockfill strength categories. An accompanying empirical model is presented to estimate rockfill strength based on void ratio and rock type, offering a practical tool for rapid application. The model simplifies to five strength envelopes and demonstrates strong predictive performance while maintaining simplicity. The evaluation of model prediction accuracy indicates that the strength model is applicable for soils with a median particle size greater than 2 mm and a fines content less than 25%.
Co-authors: Marco Arrieta, John C Cunning, and P Mark Hawley

Julian Venter
Manager Geotechnical Open Pit
AngloGold Ashanti, Australia
Julian graduated from the University of Pretoria (UP) in 2000 with a Bachelor of Civil Engineering. He subsequently obtained a Master of Geotechnical Engineering from UP in 2004, a Graduate Diploma of Rock Mechanics from the University of the Witwatersrand in 2007, followed by an MBA and a Master of Mineral Economics from Curtin University in 2017. He started his working career with SRK Consulting in Johannesburg in 2002 where he gained a well-rounded geotechnical exposure to a variety of problems including open pit and underground mining and construction. For geotechnical risk work carried out at SRK, he was corecipient of the SAIMM Gold medal in 2007 and corecipient of the ARMA Award for Applied Rock Mechanics Research in 2009. In 2008, Julian and his family moved to Tom Price in Australia where he joined Rio Tinto’s Tom Price iron ore mine as senior geotechnical engineer. In 2016, Julian started with AngloGold Ashanti as geotechnical manager for the continental Africa region. Throughout his career Julian has served on open pit design teams in roles including contributor, technical lead, project manager, project director and third party reviewer for more than 200 open pits and cut backs. Based on this experience he has become a champion of rigorous data-based design processes based on a proper understanding of risk.
Mining companies recognise that the sustainability of their business is, amongst other factors, dependent upon efficient risk management in the exploration, extraction and processing of mineral resources, including sound mine excavation design, operational execution and validation practices.
In the mining industry, discussions on risk management are often focused on the process, in particular the risk assessment component, with insufficient attention given to the foundation principles and the supporting framework – as defined for example in ISO 31000. However, at an executive level, management remains accountable for risk management but may not possess the necessary expertise required to fully grasp its complexities. It is therefore incumbent upon the various technical disciplines to clearly articulate the coordinated activities required, for senior management to direct and control the company with respect to its risk attitude and appetite.
This paper provides guidance on business processes that incorporates elements from both the risk management principles and framework to support a company-specific governance approach, tailored to its unique operational context, that will benefit the business.
This is important to risk owners and technical personnel involved with risk criteria. Notably, where this involves geotechnical engineering, there needs to be transparent, repeatable, robust business processes in place for data management, geotechnical design, operational execution, performance validation, competency management, records management, and site-based assurance.
These business processes are discussed by highlighting the specific challenges in the geotechnical engineering discipline and addressing leadership, group risk and project management, mineral resource and reserve reporting, critical hazard management and a group geotechnical engineering standard.
Co-authors: Julian Venter, Kobus du Plooy and John de Souza
Opening Speaker
Dr Chad Williams
Manager, Geotechnical & Hydro
Rio Tinto, USA
Invited Speakers
Adriana Sánchez Morán
Technical Director Hydrogeology
WSP, UK
Adriana is a geologist (BSc) and a geology engineer (MSc). She graduated from the University of Oviedo, Spain, and specialised in hydrogeology at the University of Catalonia. With 20 years of international experience, she started her career in civil engineering and environmental consulting, acquiring deep technical knowledge in hydrogeology conceptualisation and numerical modelling. For the last 10 years, she has worked at BHP in technical and leading roles related with hydrogeology and mine water management, with a strong multi-disciplinary approach connected with geomechanics, tailings management and environment. She was involved in first and second lines of technical assurance in BHP operations in South America, Australia and US, where she provided technical expertise connected to business risk management and innovation. Since moving back to Europe, she has been part of the WSP UK&I Mining Group, contributing to her clients’ desire to develop practical technical solutions for complex problems in the operations.
Kate Williams
Head Geotechnical and Hydrogeology
Newmont Corporation, USA



