Key Staff

Dr. David Stone is the President of MineFill Services and is a mining engineer with over 32 years of experience consulting to metal mines. Dr. Stone is an internationally recognized expert in mine backfilling, and is a frequent author and workshop presenter at backfill conferences worldwide. His expertise spans the full spectrum from cemented rockfills, to hydraulic fills and paste fills. Dave routinely provides advice on the design and costing of backfill preparation plants, and is a technical advisor to several operating mines. In recent years Dr. Stone has provided technical assistance with the design and construction of thickened tailings, paste and filtered tailings plants for surface disposal. His expertise includes paste rheology, as well as the design and operation of thickeners, filtration plants, and pumping systems for surface and underground disposal.

Ken Pearson is a senior industrial designer with MineFill Services, Inc. Ken has over 45 years of experience in the design, construction and commissioning of industrial plants. Ken’s expertise includes a wide range of industrial processes, plant equipment, and control systems including aggregate and cement conveyance and handling systems. Mr. Pearson has managed and performed detailed designs for over a dozen paste plants including Barrick – Kahama (Tanzania), Cayeli Bakir Isletmeleri (Turkey), Mineracao Caraiba (Brazil), Minas Neves Corvo (Portugal), and Cannington (Australia). Mr. Pearson has considerable expertise in construction and plant commissioning.

Bernie Ting is a senior backfill engineer with MineFill Services Inc. After receiving degrees in materials science engineering (B.A.Sc.) and electrical and computer engineering (M.A.Sc.), Bernie has worked on over 25 backfill projects and was the chief paste engineer for the Giant Mine remediation project. He is experienced in designing, commissioning and operating various types of backfill systems. His latest research areas include cold climate backfill, fiber-reinforced backfill, and backfill using reclaimed tailings.

Beverlee Heiszler is an accomplished office administrator with a strong commitment to high-quality job performance. Her professional background includes technical writing and technical support, full-charge bookkeeping, office management, sales and customer service in a variety of industries. Bev brings over 40 years’ administrative experience to her position as Office Manager at MineFill Services.

Chi Seng Tong is a senior structural engineer with over 35 years of experience in the design, construction and rehabilitation of heavy industrial and mining plants. During his long tenure. Mr. Tong has worked on many projects like ALCOA-Alumar (Brazil), Onça-Puma (Brazil), Nickel-RIM South (Canada), CAMECO-MRX (Canada), ERAMET (Gabon), VALE Carnalita (Brazil), VALE Colborne and Long Harbor (Canada) , Paste Backfill plants (Russia, US, Canada and Ecuador), Petrochemical & Chemical plants (Brazil and Saudi Arabia), Power plants (Brazil) and Water Treatment plants (Brazil). Mr. Tong has MSc in Production Management and worked as project manager at Backfill Group at Hatch.

Sharan MacDonell is a skilled and versatile Project Coordinator/Expediter in the mining engineering and construction business. She is a project management and administration professional with over 20 years of experience in project and office administration, business development, corporate communications, facilities management where she lead both small and large teams. Sharan joined MineFill in 2017 driving successful project and study delivery for our customers.