Process Modeling Engineer | San Francisco, CA | Houston, TX

Mineral Processing and Metallurgy
California, United States
May 14, 2026
$100,000 - $160,000 / year
Full-time
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Job Description

Company: Mariana Minerals
Location: San Francisco, California; Houston, Texas, United States (On-site)
Category: Mineral Processing and Metallurgy
Job Type: Full-time
Experience Level: Senior-Level
Salary: $100,000 – $160,000 USD/year

Job Summary
Mariana Minerals is seeking a highly motivated Process Modeling Engineer to support the development of next-generation refining processes for critical minerals.

This role focuses on process modeling, heat and material balance development, process simulation, model validation, optimization studies, and scalable process design for first-of-a-kind mineral refining facilities.

Key Responsibilities

  • Develop steady-state and dynamic process models for integrated mineral refinery systems
  • Establish heat and material balances using tools such as ASPEN, SysCAD, OLI, or METSIM
  • Automate equipment and process sizing for reactors, heat exchangers, filters, crystallizers, evaporators, and separators
  • Link process models to datasheets and other engineering tools
  • Develop and maintain process simulation databases with consistent and traceable modeling assumptions
  • Calibrate and reconcile models using pilot or plant operating data
  • Conduct process optimization studies focused on energy recovery, recycle strategies, and material efficiency
  • Develop dynamic process models to validate PLC and DCS programming
  • Evaluate and optimize buffer sizing throughout the design process
  • Link process models to CAPEX and OPEX estimation tools
  • Document modeling methodologies, assumptions, results, and technical findings for design reviews and assessments

Qualifications
– Proficiency in one or more process simulation tools such as ASPEN Plus, HYSYS, SysCAD, OLI Studio, OLI Flowsheet, or METSIM
– Experience developing material and energy balances for multi-step integrated process systems

  • Deep understanding of mass transfer, heat transfer, thermodynamics, fluid flow, and reaction engineering
  • Strong grasp of chemical equilibria and phase behavior in aqueous and non-aqueous systems
  • Experience with data reconciliation, parameter fitting, and model validation using experimental or operational data
  • Experience developing steady-state and dynamic process models
  • Competency with Python or MATLAB for model automation, data processing, and custom calculations is a strong plus
  • Experience integrating process modeling outputs into EPC deliverables such as PFDs, P&IDs, equipment datasheets, and control narratives
  • Ability to translate lab and pilot data into robust, scalable process models
  • Strong technical communication skills for design reviews, techno-economic assessments, and regulatory submissions

What We Can Offer You

  • Estimated base salary of $100,000 – $160,000 USD/year
  • Equity offer as part of the compensation package
  • Opportunity to support the development of next-generation critical minerals refining processes
  • Collaboration with R&D, pilot operations, and project execution teams
  • Exposure to software, automation, and data-driven decision-making
  • Opportunity to work on first-of-a-kind mineral refining facilities
  • Collaborative culture focused on ownership, automation, and knowledge sharing

Why This Role Matters
This role is important because it helps Mariana Minerals develop scalable process models that support the design, optimization, and economic evaluation of critical minerals refining facilities.

Apply
👉 Apply online: https://jobs.ashbyhq.com/marianaminerals/451bfa6d-b429-450f-b272-5a77d52cf384

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

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