Zefenia Nhengu
Gweru
Summary
Electrical and Instrumentation Engineer with extensive experience in delivering complex mining projects and enhancing operational performance through strategic maintenance and reliability initiatives. Proven track record in leading diverse teams and managing budgets to ensure effective implementation of automation systems and safety standards.
Overview
23
23
years of professional experience
Work History
Electrical and Instrumentation Engineer
Williamson Diamond Limited
12.2025 - Current
- Designed power reticulation systems, MV/LV, MCC; developed electrical safety standards and instrumentation standard operating procedures to enhance safety and compliance
- Managed multicultural team of specialists and technicians to maintain and ensure reliability of electrical, control, and instrumentation equipment
- Developed functional specifications and designed control, instrumentation, and automation systems to meet operational requirements
- Oversaw operational technology systems to ensure effective management and integration., obsolescence, spares and sectional budgets
Electrical and Instrumentation Specialist
Unki Mines - Valterra Platinum
01.2019 - 11.2025
- Managed installation of electrical, control, and instrumentation equipment, including pneumatic valves, flowmeters, density meters, level measuring instruments, and weight meters, to ensure operational readiness.
- Verify design specifications and interpret electrical and instrumentation diagrams to improve process performance (P&IDs, Loop diagrams etc.) and electrical schematics
- Directed maintenance strategies for electrical and automation systems to enhance reliability of equipment, incorporating work management and maintenance tactics such as RCA and FMEA.
- Oversaw contractor operations, ensuring compliance with safety regulations and project standards to maintain safe work practices.
Control and Instrumentation Technician
Unki Mines - Valterra Platinum
08.2010 - 12.2018
- Supervised contractors during project execution and commissioning, ensuring adherence to FAT, SAT, and QA/QC standards
- Executed plant control system installations and maintained networks using Profibus and Profinet protocols to enhance operational reliability
- Programmed PLC systems using Siemens PCS7, S7, and TIA Portal to ensure efficient automation processes.
- Developed WinCC SCADA systems to improve monitoring and control of plant operations.
- Designed and implemented maintenance strategy to optimize system performance and minimize downtime
Control and Instrumentation Technician
Tati Nickel Mining Company
08.2006 - 07.2010
- Calibrated instruments for precise measurements in process control to ensure accuracy and reliability in process control
- Troubleshot instruments and control systems for effective operations during shifts and control systems during shift coverage, ensuring operational reliability
- Developed training program for local technicians, enhancing skill levels within workforce
Electrical and Instrumentation Foreman
Mimosa Mining Company
03.2003 - 07.2006
- Led the execution, commissioning and optimization of phase 3 expansion projects.
- Designed, installed, and administered Industrial Automation and Control Systems (IACS) for crushing, milling, flotation, tailings, and concentrate handling processes
- Developed and implemented maintenance strategies for the plant electrical and instrumentation equipment, ensuring reliability and safety
- Led and supervised a team of Instruments Technicians and Electricians to ensure optimum plant availability.
- Managed spares inventory and budgets for instrumentation and electrical department, ensuring resource availability
- Troubleshot and repaired faulty instruments and Fieldbus communication systems (Devicenet, Controlnet) to restore operational efficiency
Education
MSc - Electrical power Engineering
University of Zimbabwe
Zimbabwe08-2023
BSc Honours - Applied Physics and Instrumentation
Midlands State University
Zimbabwe01-2019
Advanced Diploma - Electrical Engineering
Bulawayo Poly
Zimbabwe01-2012
Advanced Diploma - Control and Instrumentation
City And Guilds
Zimbabwe01-2002
Skills
- Electrical design
- Power systems MV/LV distribution
- Load flow
- Substation
- MCC
- Transformers
- Motors
- VFDs
- Automation PLC
- DCS
- SCADA
- Siemens systems
- Rockwell systems
- Functional specifications
- QA/QC
- Commissioning
Technical Expertise
MV/LV distribution, Load flow, Substation, MCC, transformers, motors, VFDs, soft starters, PLC/DCS/SCADA, networking and programming. Siemens and Rockwell systems, EC&I design, FAT, SAT, QA/QC. Functional specifications, commissioning, Documentation
Projects Delivered
- Mimosa Mining Company Phase 3 expansion, Lead Electrical and Instrumentation engineer, Installation and commissioning of Electrical, Instrumentation and automation systems for 18 flotation cells, Reagent mixing plant, concentrate and tailings clarifiers, Pressure filter and various equipment upgrades.
- Unki Mines, Underground mine and Concentrator plant, Director, Directed installation and commissioning of Electrical, Instrumentation and automation systems for a new underground mine and concentrator plant.
- Williamson Diamond Mine, Automation Engineer, Automation of the diamond processing plant, including Crushers, Mills, Scrubbers, conveyors, screens, pumps, thickeners and DMS plant.
Timeline
Electrical and Instrumentation Engineer
Williamson Diamond Limited
12.2025 - Current
Electrical and Instrumentation Specialist
Unki Mines - Valterra Platinum
01.2019 - 11.2025
Control and Instrumentation Technician
Unki Mines - Valterra Platinum
08.2010 - 12.2018
Control and Instrumentation Technician
Tati Nickel Mining Company
08.2006 - 07.2010
Electrical and Instrumentation Foreman
Mimosa Mining Company
03.2003 - 07.2006
MSc - Electrical power Engineering
University of Zimbabwe
BSc Honours - Applied Physics and Instrumentation
Midlands State University
Advanced Diploma - Electrical Engineering
Bulawayo Poly
Advanced Diploma - Control and Instrumentation
City And Guilds