Senior Process Engineer - US MMM

Job Title: Senior Process Engineer – US MMM (MES
002B)

Company: Worley

Location: Mesa, Arizona

Employment Type: Full‑time

Reporting Manager

Title:

Director, Engineering

Worley is seeking an experienced Metallurgical Senior 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. 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.

• 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 test work 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., Met Sim 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 safety, environmental, statutory and regulatory requirements.
• Adhere to company engineering procedures, technical standards, quality plans and safety policies.
• Liaise with project managers, discipline leads and stakeholders to align metallurgical scope with project objectives, scope, schedule and budget.
• Identify and manage risks associated with process design, metallurgical performance, equipment selection and infrastructure interfaces.
• Support management of schedule, cost, quality and scope for assigned metallurgical and process…