Senior Process Engineer-MMM-Gold Experience Required

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.

Purpose:

We are seeking a Senior Process Engineer with deep technical knowledge and hands-on experience in gold processing. This role will focus on designing, optimizing, and delivering gold extraction processes for both greenfield and brownfield projects, including CIP/CIL, heap leaching, gravity separation, pressure oxidation, bio-oxidation, roasting, and refractory ore treatment.

You will contribute to both brownfield and greenfield projects, bringing value to our Mining, Minerals & Metals (MMM) clients through innovative process designs and optimizations.

All candidates must have proper documentation that proves their ability to work in the United States.

This is a full-time position based at our Mesa, Arizona office, with potential project assignments in Tucson, Arizona or other regions within United States.

Responsibilities:

• Lead the development and execution of conceptual, pre-feasibility, feasibility, and detailed process designs for gold and base metal recovery circuits.
• Prepare and oversee process deliverables including:
  • Process Flow Diagrams (PFDs) and heat & material balances
  • Piping & Instrumentation Diagrams (P&IDs)
  • Process design criteria and philosophies
  • Mass, energy, and water balances
  • Process control narratives and functional descriptions
  • Line lists, valve lists, and instrument lists
  • Process equipment specifications and data sheets
• Conduct design reviews to ensure alignment with project requirements, metallurgical test work, and operational best practices.
• Ensure compliance with applicable codes, standards, regulations, and client specifications (e.g., MSHA, ASTM, ISO).
  • Design and specify major gold processing equipment, including:
  • Leach tanks, thickeners, clarifiers, CIP/CIL systems
  • Adsorption, elution, electrowinning, and refining circuits
  • Gravity recovery units and clean-up equipment
  • Detoxification systems and cyanide destruction units
  • Heap leach pads, solution collection and handling infrastructure
• Size preliminary equipment and coordinate with vendors for technical bid evaluations, ensuring equipment meets process requirements.
• Maintain familiarity with key suppliers, equipment innovations, and performance metrics.
• Develop and validate process simulations using tools such as METSIM, SysCAD, or similar software.
• Perform hydraulic calculations and slurry transport designs for pumping and piping systems.
• Conduct process optimization, debottlenecking, and plant audits to improve recovery, efficiency, and safety.
• Analyze and supervise metallurgical and pilot test work programs, particularly for gold recovery flowsheets, including refractory ore treatment (e.g., POX, BIOX, roasting).
• Act as lead process engineer or project design lead, overseeing a team of engineers, designers, and drafters.
• Coordinate with other engineering disciplines (mechanical, piping, electrical, civil/structural) for integrated design solutions.
• Support 3D model reviews, layout planning, and plot plan development.
• Provide technical input for operating and capital cost estimates at all study phases.
• Interface with project managers, clients, vendors, and regulators to ensure alignment and successful project delivery. Validate and review process deliverables to meet customer, project, and QA/QC standards.
• Participate in and support HAZOP, HAZID, SIL, and risk assessment studies.
• Adhere to company work procedures, technical guidelines, safety regulations, and customer-specific protocols.
• Apply risk management strategies to mitigate operational and technical risks.
• Provide technical mentorship to junior engineers, reviewing deliverables and supporting professional development.
• Promote a culture of safety, quality, and continuous learning within the team.
• Stay current with emerging gold processing technologies, industry innovations, and sustainable practices.
• Foster innovation by evaluating and implementing new technologies and methodologies in mineral processing.
• Review and, if licensed, stamp engineering documents in accordance with professional engineering standards.
• Collaborate closely with clients, technology providers, and regulatory bodies to achieve project objectives.
• Willingness to visit mine sites to gather operational data, assess challenges, and build relationships with client operations teams.
• Stay updated on emerging gold processing technologies and best practices.

Qualifications

• Bachelor's degree in Metallurgy, Mineral Processing or Chemical Engineering.
• 8+ years of experience as a Lead or Senior Process Engineer within the mining industry.
• 4+ years of experience in gold processing (CIL, CIP, heap leach, etc.).
• Licensed Professional Engineer (PE) in Process Engineering in the state of Arizona or the ability to obtain licensure within an expedited timeframe.
• 2+ years of EPC/EPCM project experience is preferred.
• Strong background in base metals is still desirable (e.g., copper, nickel, lead-zinc).
• Advanced degree in Process Engineering is a plus.
• Familiarity with mining regulatory/MSHA certification and standards is preferred.

Moving forward together

We want our people to be energized and empowered to drive sustainable impact. So, our focus is on a values-inspired culture that unlocks brilliance through belonging, connection and innovation.

We're building a diverse, inclusive and respectful workplace. Creating a space where everyone feels they belong, can be themselves, and are heard.

And we're not just talking about it; we're doing it. We're reskilling our people, leveraging transferable skills, and supporting the transition of our workforce to become experts in today's low carbon energy infrastructure and technology.

Whatever your ambition, there's a path for you here. And there's no barrier to your potential career success. Join us to broaden your horizons, explore diverse opportunities, and be part of delivering sustainable change.

We're committed to building a diverse, inclusive and respectful workplace where everyone feels they belong, can bring themselves, and are heard. We provide equal employment opportunities to all qualified applicants and employees without regard to age, race, creed, color, religion, sex, national origin, ancestry, disability status, veteran status, sexual orientation, gender identity or expression, genetic information, marital status, citizenship status or any other basis as protected by federal, state, or local law.

Our policy is to conduct background checks for all candidates who accept an offer of employment with us.

Please note: No agency representation or submissions will be recognized for this vacancy.