OMBERAI Mandingaisa, known as Ombex in the industry, is a respected figure in the field of rock engineering and mining. With over 28 years of experience, his journey has been shaped by a passion for safety, education, and innovation in mining. As the Discovery and Geosciences Manager at Unki Mine, Mandingaisa has become a leading advocate for advanced rock engineering practices in Zimbabwe and beyond.
Q: Omberai, tell us about yourself. Who is Omberai Mandingaisa?
A: I’m currently the Discovery and Geosciences Manager at Unki Mine and a certified Professional Natural Scientist. I hold a Master of Science in Mining Engineering and a Bachelor of Science in Geology, along with several advanced rock engineering certifications. I’m also the founder of the Zimbabwe National Institute of Rock Engineering (ZINIRE) and the first president of this ISRM’s national group in Zimbabwe. My passion for education extends to lecturing at the University of Zimbabwe and Midlands State University, where I teach advanced rock engineering.
Q: Which field of rock engineering do you specialise in?
A: I specialise in using AI, particularly machine learning and deep learning, in design and evaluation of pillars and support design, as well as applied numerical modelling. This area is crucial for ensuring the safety of mining operations, especially regarding fall-of-ground management. For me, it’s the best way to make a significant impact on the industry.
Q: Take us through the work of a rock engineer in mining.
A: Rock engineering is all about designing stable mines and slopes as well as managing fall-of-ground risk, one of the most dangerous aspects of mining. This includes rock mechanics, which focuses on understanding rock mass behaviour during mining processes, and strata control, which ensures effective and stable support, tunnel and slope designs. Our work involves both macro designs for regional mine stability and micro designs for local excavation stability, alongside continuous monitoring and research.
Q: Why is rock engineering so important in mining?
A: It’s vital for ensuring the safety and stability of tunnels and slopes, preventing collapses and slope failures that could cost lives and revenue. Without proper rock engineering, mining operations can become hazardous.
Q: What does it take to become a rock engineer?
A: First, a geoscience or engineering qualification is essential. It helps to have a mining-related degree. After that, you register with organisations like SANIRE or ZINIRE for mentorship. Qualifications progress through several stages, starting with the Strata Control Certificate, followed by the Rock Mechanics Certificate, and ultimately the Advanced Rock Engineering Certificate. This pathway ensures that rock engineers are well-equipped for the job.
Q: What attracted you to mining?
A: I wasn’t initially drawn to mining. When I left high school, I was more inclined toward medical fields, but I realised during university orientation that mining fascinated me. The idea of designing stable tunnels and slopes, and contributing to safety in mining became my driving force.
Q: What challenges have you faced in underground mining?
A: Underground mining presents constant challenges, particularly with ground stability after each blast. Investigating fatalities related to falls of ground is painful, as it often reveals preventable issues. Lack of knowledge among practitioners and the use of substandard support methods also contribute to the challenges.
Q: How did you overcome these challenges?
A: I founded ZINIRE to address the root cause: lack of knowledge. ZINIRE has become a cornerstone in training and certifying rock engineers in Zimbabwe, helping us meet international best practices. Additionally, I founded Resolve Rock Engineering Training Services to further the development of rock engineers.
Q: What has your experience in underground mining been like?
A: My experience spans various roles, from production geologist to mine manager and ultimately to discovery and geosciences manager. Over the years, I’ve gained extensive experience in all facets of mining, which has shaped my approach to rock engineering.
Q: Reflecting on your career, what helped you advance to leadership?
A: Early mentorship, particularly from Brighton Daka, was pivotal in my career. Technical guidance from experts like Lucas van Aswegen and Prof. Dick Stacy expanded my knowledge. On the management side, training through the Korn Ferry programme and mentorship from industry leaders like Caston Musa and Walter Nemasasi played a huge role.
Q: What advice do you have for aspiring rock engineers?
A: Believe in yourself and never stop learning. Rock engineering exams are tough, but they aren’t about memorising like academic exams. Instead, it’s about applying what you’ve learned through experience, so always seek mentorship and guidance from seasoned professionals.
Q: Tell us about ZINIRE and its impact.
A: ZINIRE, founded in 2013, is accredited by the International Society for Rock Engineering and Rock Mechanics (ISRM). It has greatly contributed to upskilling local practitioners, reducing falls of ground, and promoting research and development in rock engineering. ZINIRE’s membership also provides access to valuable resources and international standards.
Q: What role does ZINIRE play in the education and development of rock engineers?
A: ZINIRE plays a crucial role by providing mentorship to aspiring rock engineers through our Young Rock Engineers Foundation (YREF) at institutions like the Zimbabwe School of Mines and Midlands State University. We also work with universities to ensure the rock engineering curriculum aligns with global best practices.
Q: How does ZINIRE collaborate with other mining engineers’ associations?
A: ZINIRE is part of the Chamber of Mines SHE Committee and works closely with the Association of Mine Managers of Zimbabwe (AMMZ) and the Association of Mine Surveyors. Our collaborative efforts strengthen both fields by sharing knowledge and presenting developments at each other’s events.
Q: How is ZINIRE contributing to achieving SDG 4 and SDG 5?
A: For SDG 4, we’re developing local qualifications and creating educational resources to improve access to high-quality education in rock engineering. We also run workshops and partner with universities to promote knowledge sharing and industry-academia collaboration. As for SDG 5, we’re committed to gender equality by ensuring that rock engineering is an accessible and inclusive field for all.
Q: How is ZINIRE shaping the future of rock engineering in Zimbabwe?
A: ZINIRE’s work is transforming rock engineering in Zimbabwe by improving knowledge, enhancing safety, and helping local practitioners meet international standards. Through education, mentorship, and collaboration, we’re creating a brighter, safer future for the mining sector.
