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Trainee Minerals Processing Engineer Jobs in California

Mariana Minerals

Sr. Process Engineer

San Francisco, CA · On-site

$120K - $140K/yr

... minerals processing, chemicals, specialty materials, oil & gas, or similar industry * Strong ... Engineer Out Requirements, then Automate - We simplify, optimize, and then automate for scale.

New

Mariana Minerals

Metallurgical Engineer

San Francisco, CA · On-site

$100K - $140K/yr

Role Overview Mariana Minerals is seeking a highly motivated Metallurgical Engineer to support process development activities and pilot-scale testing for our CopperOne mine pilot facility in San ...

Mariana Minerals

Metallurgical Engineer

San Francisco, CA · On-site

$130 - $180/hr

Role Overview Mariana Minerals is seeking a highly motivated Metallurgical Engineer to support process development activities and pilot-scale testing for our CopperOne mine pilot facility in San ...

Mariana Minerals

Materials Engineer

San Francisco, CA · On-site

$100K - $140K/yr

About Mariana Minerals Mariana Minerals is a software-first, vertically integrated minerals company ... Evaluate and select equipment and process configurations for pilot-scale and commercial-scale ...

Mariana Minerals

Staff Product Manager

San Francisco, CA · On-site

$180K - $210K/yr

PlantOS Our autonomy platform for fixed-plant mineral processing - lithium refining, SX-EW ... You may have started as an engineer and moved into product because you wanted to own the outcome ...

MP Materials Corp.

Metallurgy Technician

Mountain Pass, CA · On-site

$32.53 - $40.34/hr

Experience in laboratory sample preparation, wet chemistry, or mineral processing tests. * College-level coursework in chemistry, geology, mining, or materials engineering. * Associate or bachelor ...

Mariana Minerals

Contract Piping Designer

San Francisco, CA · On-site

$82.66 - $130.87/hr

About Mariana Minerals Mariana Minerals is a software-first, vertically integrated minerals company ... Draft process flow diagrams (PFDs) * Configure and draft smart piping and instrumentation diagrams ...

Antora Energy

Senior Process Engineer

San Jose, CA · On-site

$121K - $157K/yr

... minerals or multi-year construction timelines. We are growing our company with people who put team ... As a key member of our engineering team, you will own process engineering deliverables for ...

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Trainee Minerals Processing Engineer information

What is a trainee minerals processing engineer?

A Trainee Minerals Processing Engineer is an entry-level professional who assists in the extraction and processing of minerals from ores. They work under the supervision of experienced engineers to learn about crushing, grinding, separation, and concentration techniques used in mineral processing plants. Their responsibilities typically include monitoring equipment, collecting samples, analyzing data, and ensuring that safety and environmental standards are met. This role serves as a foundation for gaining practical experience and advancing to more senior engineering positions within the mining and minerals industry.

What does a trainee minerals processing engineer do?

As a Trainee Minerals Processing Engineer, your daily activities often include monitoring ore processing operations, collecting and analyzing samples, and assisting with troubleshooting plant equipment. You'll also collaborate closely with senior engineers and plant operators to implement process improvements and ensure safety protocols are followed. These tasks are essential for optimizing production efficiency and quality, while also supporting the team's broader objectives of maximizing resource recovery and minimizing environmental impact. Over time, you'll gain exposure to project management and technical reporting, which can open pathways to more advanced engineering roles.

What skills and qualifications are needed to be a trainee minerals processing engineer?

To thrive as a Trainee Minerals Processing Engineer, you need a solid understanding of mineral processing principles, typically supported by a degree in chemical, metallurgical, or mining engineering. Familiarity with process simulation software, laboratory testing equipment, and safety management systems is commonly required. Strong analytical skills, attention to detail, and effective teamwork are standout soft skills in this role. These competencies are essential for optimizing mineral recovery, ensuring safety, and contributing to efficient plant operations.

What is the difference between Trainee Minerals Processing Engineer vs Junior Minerals Processing Engineer?

AspectTrainee Minerals Processing EngineerJunior Minerals Processing Engineer
QualificationsTypically pursuing or recently completed relevant degree (e.g., Mining, Mineral Processing)Usually holds a degree in a related field, with some practical experience
Work EnvironmentTraining programs, supervised tasks, entry-level site workMore independent responsibilities, project involvement
Employer UsageInternship or apprenticeship programs within mining companiesEntry-level full-time roles in mineral processing plants or consulting firms

The main difference is that a Trainee Minerals Processing Engineer is in a learning or internship phase, focusing on gaining foundational skills, while a Junior Minerals Processing Engineer has completed their education and is taking on more responsibilities in processing operations.

What are the most commonly searched types of Minerals Processing Engineer jobs in California?

The most popular types of Minerals Processing Engineer jobs in California are:

What are popular job titles related to Trainee Minerals Processing Engineer jobs in California?

For Trainee Minerals Processing Engineer jobs in California, the most frequently searched job titles are:

What job categories do people searching Trainee Minerals Processing Engineer jobs in California look for?

The top searched job categories for Trainee Minerals Processing Engineer jobs in California are:

What cities in California are hiring for Trainee Minerals Processing Engineer jobs?

Cities in California with the most Trainee Minerals Processing Engineer job openings:

Trainee Minerals Processing Engineer jobs near you

Sr. Process Engineer

Mariana Minerals

San Francisco, CA • On-site

$120K - $140K/yr

Full-time

Posted 3 days ago

New

Job description

About Mariana Minerals
Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We're reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Role Overview
Mariana Minerals is looking for a highly motivated Sr. Process Engineer to join our San Francisco Pilot Plant team. You will lead the design, deployment, and operation of first-of-its-kind refining processes for critical minerals, while also supporting development of software for automated plant optimization. This position is highly hands-on and will play a critical role in bridging R&D and Operations, ensuring processes are robust, safe, cost-effective, and suitable for commercial production.
What You'll Do
  • Work closely with Pilot Plant Technicians to operate, maintain, troubleshoot, and improve pilot-scale processing equipment
  • Design experiments to evaluate process performance, recovery, throughput, and product quality
  • Create and maintain key engineering and operational documentation such PFDs, HMBs, P&IDs, Operating Procedures, and Process Control Narratives
  • Lead equipment design scopes from concept, through procurement, fabrication, installation, commissioning, and handover to Operations
  • Work closely with cross-functional teams including R&D, commercial plant design engineers, project execution teams, and more to scale designs from lab to the pilot to production scale
  • Work closely with the software and machine learning teams to develop and implement reactor and plant optimization algorithms
  • Travel to pilot and commercial sites to drive commissioning, startup, and ramp-up alongside operations & plant design teams
What You'll Bring
  • B.S., M.S., or PhD in Chemical Engineering or related field
  • Minimum of 5 years of experience supporting R&D scale up, pilot plant operation, and/or commercial production in minerals processing, chemicals, specialty materials, oil & gas, or similar industry
  • Strong understanding of reaction engineering, solid-liquid separation, leaching, ion exchange, solvent extraction, and/or similar unit operations
  • Hands-on experience designing, commissioning, and operating pilot or commercial-scale process equipment
  • Ability to design experiments, problem-solve, and analyze complex datasets
  • Strong commitment to Health & Safety and experience with risk management, management of change, and hazard assessment
  • Excellent technical writing, communication, and teamwork skills
  • Comfort working in fast-paced, cross-functional environments
Our culture is built on three principles:
Extreme Ownership - We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate - We simplify, optimize, and then automate for scale.
Share Your Legos - We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply.

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