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Trainee Minerals Processing Engineer Jobs in California

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

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

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 ...

Antora Energy

Senior Process Engineer

San Jose, CA · On-site

$121K - $157K/yr

  • Medical

  • Life

  • Retirement

... 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 ...

Antora Energy

Senior Process Engineer

San Jose, CA

$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 ...

Mariana Minerals

Sr. Technical Sourcer

San Francisco, CA · On-site

$100K - $140K/yr

About Mariana Minerals Mariana Minerals is a software-first, vertically integrated minerals company ... The Role We are hiring a Senior Technical Sourcer to help build world-class engineering and ...

Coreshell Technologies

Process Engineer

San Leandro, CA · On-site

  • Medical

  • Dental

  • Vision

  • Retirement

... critical mineral supply in the US and Europe. We strive to transform the global energy and ... We are seeking a Junior Process Engineer to join our battery process technology team. This role ...

Coreshell Technologies

Process Engineer

San Leandro, CA · On-site

$72K - $85K/yr

  • Medical

  • Dental

  • Vision

  • Retirement

... critical mineral supply in the US and Europe. We strive to transform the global energy and ... We are seeking a Junior Process Engineer to join our battery process technology team. This role ...

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Trainee Minerals Processing Engineer information

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 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 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 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

Pilot Plant Technician

Mariana Minerals

San Francisco, CA • On-site

Full-time

Re-posted 3 days ago

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 technician to join our San Francisco Pilot Plant team. You will support 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
  • Assist engineers and other technicians to operate and monitor copper extraction chemical processes
  • Safely handle chemicals, raw materials, and waste streams in compliance with SOPs and regulations
  • Support sampling, quality checks, and basic laboratory measurements
  • Assist with design, install, startup, and commissioning of new equipment and processes
  • Take ownership of plant cleanliness and organization, ensuring work areas, tools, and equipment are well-maintained and ready for operations
  • Perform routine maintenance, inspections, and basic mechanical repairs; document findings & actions in a Computerized Maintenance Management System (CMMS)
  • Create and maintain procedures, experimental records, shift reports, and other critical operations documents

What You'll Bring
  • Associate degree, technical certificate, or equivalent experience in chemical technology, process technology, industrial operations, or a related field
  • 3+ years of experience operating pilot plant or commercial scale industrial equipment in the minerals processing, chemicals, specialty materials, oil & gas, biotech, or similar industry
  • Prior exposure to core plant safety work processes such as Lockout/Tagout (LOTO), hot work permitting, confined space entry, and safe work permitting systems
  • Experience using human-machine interfaces (HMIs) and plant software systems to monitor, control, and adjust process operation
  • Experience with hands-on equipment installation, modification, and troubleshooting
  • Basic knowledge of inorganic chemistry, pH, and reaction stoichiometry a plus
  • Experience using engineering documents such as PFDs, control narratives, or P&IDs is a plus
  • Climb stairs, stand for extended periods of time, and safely lift up to 50 lbs
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.

Apply