Worley is a global professional services company of energy, chemicals and resources experts headquartered in Australia.
Right now, we’re bridging two worlds as we accelerate to more sustainable energy sources, while helping our customers provide the energy, chemicals and resources that society needs now.
We partner with our customers to deliver projects and create value over the life of their portfolio of assets. We solve complex problems by finding integrated data-centric solutions from the first stages of consulting and engineering to installation and commissioning, to the last stages of decommissioning and remediation. Join us and help drive innovation and sustainability in our projects.
Our business is growing and we need additional experienced people to join our team! The successful candidate will be planning, co-ordinating and managing the design, procurement, construction and commissioning of assigned large capital projects. Additionally, he/she will ensure clear agreement of client objectives and these objectives are met or exceeded and provide strong HSE leadership.
Purpose :
Worley is seeking an experienced Metallurgical Sr. Process Engineer to support the development and execution of mining and mineral processing facilities. The role focuses on process plant design, metallurgical performance and integration with site infrastructure, supporting projects from early studies through detailed engineering and commissioning.
The role is primarily office based and focuses on metallurgical process design, interpretation of metallurgical testwork, development of process criteria, and support of engineering deliverables across feasibility studies, detailed engineering, and project execution phases
This position plays a key technical role in delivering safe, operable and cost effective process plant solutions in line with Worley’s Engineering Execution model.
This role is based at our Mesa, Arizona office and is a full-time opportunity.
Responsibilities:
- Provide metallurgical and process engineering support for crushing, grinding, classification, flotation, leaching, thickening, filtration, and SX/EW circuits in line with project scope.
- Analyze metallurgical, operating, and plant performance data to identify process improvement, optimization, and debottlenecking opportunities.
- Review, interpret, and apply laboratory, pilot plant, and site metallurgical testwork data to flowsheet development, design criteria, and equipment selection.
- Develop and maintain the process design basis, including metallurgical criteria, recovery targets, throughput assumptions, operating philosophy, and design margins.
- Perform and validate metallurgical and process calculations, including mass balances, metal recoveries, energy and heat balances, and comprehensive water balances.
- Develop and maintain metallurgical and process simulation models (e.g., MetSim or equivalent) to support flowsheet evaluation, equipment sizing, optimization, and trade‑off studies.
- Prepare, review, and support delivery of core process engineering deliverables including PFDs, P&IDs, metallurgical reports, calculation packages, equipment data sheets, and specifications.
- Collaborate with process engineers and multidisciplinary teams (mechanical, piping, electrical, instrumentation, IS/automation, civil, and structural) to deliver integrated and constructible designs.
- Provide metallurgical input to equipment sizing, package definition, vendor technical evaluations, and review of supplier data and documentation.
- Accurately mark up process and metallurgical designs and calculation updates to support drafting and document control activities.
- Ensure engineering deliverables align with project schedules, quality requirements, and EPCM execution frameworks.
- Review technical work prior to issue to verify accuracy, compliance with standards, and fitness for purpose.
- Support construction, commissioning, ramp‑up, and performance testing through technical reviews, troubleshooting, and operational guidance.
- Provide remote and occasional site‑based commissioning and operational support to resolve metallurgical and process‑related issues.
- Assist in developing commissioning plans and performance testing criteria for metallurgical and process systems.
- Identify, assess, and support mitigation of process‑related technical, operational, and execution risks.
- Prepare clear and concise metallurgical reports, technical memoranda, performance summaries, and study documentation.
- Develop and maintain metallurgical accounting systems and reconciliation models to support design validation and operational assessments.
- Ensure technical documentation is reviewed, approved, and issued in accordance with quality management systems.
- Participate in HAZID, HAZOP, and process risk assessments, providing metallurgical input to hazard identification and mitigation recommendations.
- Ensure metallurgical designs and operating philosophies comply with