Our Team

Andrew Predika is the general manager of Substrata Group, reporting directly to the Investment Group. With over 35 years of experience in underground gold mining, civil construction, and tunnelling infrastructure, Andrew is a distinguished professional in the industry.

Jayden Lewis is a highly experienced tunnelling professional with over a decade in micro-tunnelling, shaft sinking, pipe jacking, and drill & blast. His technical expertise spans drilling, bolting, ground support, crack injection, and shotcrete/concrete lining, with a strong focus on tunnel remediation and repair. As Head of Operations at SUBSTRATA , Jayden leads and co-ordinates workforce development, ensures technical excellence, and oversees the delivery of specialised substrata services.

Lucinda has joined Substrata Group as the Pre-Contracts, Commercial, and Finance Manager. With over 19 years of experience in corporate and construction sectors, her expertise in contract management positions her as a key leader in shaping our commercial strategy. Lucinda is a commercially astute and highly driven leader, dedicated to developing innovative commercial models that align with our clients' objectives, ensuring the successful delivery of contract requirements while fostering stronger supply chain engagement.

With over 20 years of dedicated experience in human resources and operations, Sonia is a seasoned professional specializing in the management of specialist labor within the civil and tunneling industries. Possessing an in-depth understanding of industry terminology, workforce development, and operational best practices, Sonia excels at streamlining HR processes and fostering a productive, compliant workforce.