Mechanical Engineer | San Francisco, CA

Mineral Processing and Metallurgy
California, United States
May 20, 2026
$90,000 - $125,000 / year
Full-time
Apply Now

Job Description

Company: Mariana Minerals
Location: San Francisco, California, United States (On-site)
Category: Mineral Processing and Metallurgy
Job Type: Full-time
Experience Level: Mid-Level
Salary: $90,000 – $125,000 USD / year

Job Summary
Mariana Minerals is seeking a Mechanical Engineer to support the design, integration, deployment, and improvement of pilot-scale mechanical systems and minerals processing equipment.

This role supports a next-generation minerals processing pilot plant in Houston and plays a key part in building and maintaining systems used to demonstrate and scale innovative refining technologies for critical minerals.

Key Responsibilities

  • Design, specify, and deploy mechanical systems and equipment for pilot-scale mineral processing operations
  • Work with process engineers to translate process requirements into practical mechanical and plant designs
  • Support installation, troubleshooting, and maintenance of pilot plant equipment
  • Work with pumps, piping systems, reactors, separators, filtration systems, and material handling equipment
  • Develop and maintain mechanical design documentation, including equipment specifications, layout drawings, piping schematics, and CAD models
  • Identify opportunities to improve equipment reliability, maintainability, and operational performance
  • Coordinate with vendors, fabricators, and contractors during equipment procurement and installation
  • Support safe plant operations through hazard reviews, equipment safety design, and mechanical integrity programs
  • Collaborate with process engineers, technicians, operations teams, and project execution teams
  • Support commissioning, operations, troubleshooting, and reliability improvement in hands-on plant environments

Qualifications

  • Bachelor’s, Master’s, or PhD in Mechanical Engineering or a related field
  • 3+ years of experience in operations, process scale-up, or plant design
  • Experience in minerals processing, chemicals, specialty materials, oil and gas, or related industries
  • Demonstrated experience with equipment design, commissioning, operations, and reliability
  • Experience designing and maintaining furnaces, pumps, fluid handling systems, pressure vessels, reactors, piping systems, valves, filtration equipment, separation equipment, and material handling systems
  • Ability to work closely with cross-functional teams, including process engineering, operations, and project execution
  • Strong troubleshooting and problem-solving skills in hands-on plant environments
  • Strong commitment to health, safety, environmental compliance, and mechanical integrity standards
  • Excellent technical writing, communication, and teamwork skills
  • Comfortable working in fast-paced environments, wearing multiple hats, and managing ambiguity

Why This Role Matters
This role is critical to designing and scaling reliable mechanical systems for pilot-scale mineral processing and refining technologies that support the future supply of critical minerals.

Apply
👉 Apply online: https://jobs.ashbyhq.com/marianaminerals/a46cba24-1ac0-4fa3-839e-485e1e46d48a

⚠️ Disclaimer
This job is shared for informational purposes. WeMineUp is not affiliated with the hiring company. Please apply through the official company process.

Related Jobs