Mariana Minerals jobs

Senior Accountant Houston, TX, Houston, Texas, US 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. The Role We are hiring a Senior Accountant to support the accounting operations that ensure accuracy, transparency, and reliability across Mariana's growing portfolio of assets and operating entities. This is a hands-on role focused on executing core accounting processes and supporting the monthly close, reconciliations, and financial reporting. You will work closely with the Accounting Manager, FP&A team, and operational leaders to ensure financial activity is properly recorded and reflected in company reporting. As Mariana continues to scale, this role will also contribute to improving accounting workflows, strengthening internal controls, and helping implement systems that support efficient and reliable financial operations. This role is ideal for someone who enjoys detailed work, solving accounting challenges, and building efficient processes in a fast-moving environment. What You'll Do - Support the monthly, quarterly, and annual close process - Prepare journal entries, accruals, and account reconciliations - Maintain general ledger accuracy across multiple entities - Assist with preparation of financial statements and supporting schedules - Track and record expenses, and operational transactions - Partner with FP&A to ensure accurate budget vs. actual reporting - Investigate and resolve accounting discrepancies and variances - Support implementation and documentation of accounting policies and procedures -

Geology Intern Moab, UT, Moab, Utah, United States 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. The Role We are hiring a Geology Intern to work on real, high-impact problems within the Geology team. You will contribute directly to mineral exploration, deposit development and mine production geology working closely with engineers and domain experts. This role is designed to provide hands-on experience building and shipping solutions, not just supporting tasks. What You'll Do - Work on exploration and development of a new copper deposit defining ore characteristics related to depositional environment and mineralization model - Create geologic logs of core and RC cutting from exploration drilling - Assign lithofacies designations to drilling intervals - Deliver drilling samples to lab for analysis - Correlate copper and multi-element assays to lithofacies and investigate differences by lithofacies - Collaborate with cross-functional team members including geologists, lab technicians and drilling crews - Present outcomes and learnings at the end of the internship Desired Qualifications - Currently pursuing a degree in Geology - Strong fundamentals in geologic knowledge, data recording, organization and analysis - Hands-on experience through sedimentary geology courseworkAbility to break down problems and execute independently - Clear communication and willingness to learn Why Join Us? At Mariana Minerals, you'll be part of a mission-driven team reshaping

Electrician East Texas, Joaquin, Texas, US 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. 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. POSITION DESCRIPTION: The Mariana Minerals Electrician will provide competent and effective electrical support to our Refinery operations in East Texas. Our Electrician will be primarily responsible for maintaining, repairing, testing, adjusting, and assisting in the installation and removal of all electrical, communication, control, and measurement equipment at assigned locations. Our Electrician will perform a variety of operations, maintenance, and construction tasks to maintain safe operations of the refinery and its related facilities all while ensuring the facility is operated and maintained in compliance with company and applicable regulatory standards and practices. KEY RESPONSIBILITIES AND ACCOUNTABILITIES: - Understand how to read and translate the information found within building and process blueprints and one-line diagrams to install outlets, circuits, load centers and other forms of electrical equipment - After installing the electrical equipment, test all connections to ensure all components are working properly and safely. - Troubleshoot and diagnose

Construction Project Manager Houston, TX, Houston, Texas, US 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. 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. What to Expect As a Construction Project Manager at Mariana Minerals, you will play a critical role in new facility buildout, capacity upgrades, and infrastructure delivery for one of the most ambitious companies in the critical minerals sector. You will manage general contractors and subcontractors across multiple trades to install pilot plants and collaborate cross-functionally with construction engineering, design, facilities, commissioning, and production as facilities transition to full operations. Working from both the field and the office, you will own budgets and schedules end-to-end - and help us build the software-driven project systems that make future builds faster and smarter. What You'll Do Project Ownership & Delivery - Take full ownership of assigned projects - ensuring stakeholder satisfaction, identifying opportunities, and driving cost savings across all phases. - Manage

Staff Process Engineer Houston, TX, Houston, Texas, US 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. The Role Mariana Minerals is seeking a highly motivated Process Engineer to support our next-generation minerals processing pilot plant in Houston. You will help design, deploy, and operate first-of-its-kind refining processes for critical minerals. This role is highly hands-on and will play a key role in bridging R&D and plant operations, helping scale technologies from laboratory development through pilot demonstration and ultimately to commercial production. You will work closely with technicians, engineers, and cross-functional teams to ensure processes are robust, safe, and ready for industrial deployment. What You'll Do - Lead equipment and process design from concept through procurement, fabrication, installation, commissioning, and startup - Operate, troubleshoot, and improve pilot-scale processing equipment in collaboration with pilot plant technicians - Design and execute pilot-scale experiments to evaluate process performance, recovery, throughput, and product quality - Develop and maintain key process documentation including PFDs, P&IDs, mass and heat balances, operating procedures, and control narratives - Analyze experimental and operational data to identify opportunities for process optimization and scale-up - Support development of automated plant monitoring and optimization tools in collaboration with software and machine learning teams - Ensure safe operations by supporting EHS, hazard assessments, risk management, and management

Sr. Estimator Houston, TX, Houston, Texas, US 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 how minerals are sourced, refined, and optimized by combining deep industrial expertise with software, automation, and data-driven decision-making. Join us as we build the future of responsible mineral sourcing and supply. Role Overview Mariana Minerals is seeking an experienced and detail-oriented Sr. Estimator to lead cost estimation efforts for mining and mineral processing projects. This role is responsible for developing accurate, competitive, and timely cost estimates that support strategic decision-making and project success. What You'll Do - Lead the preparation of detailed cost estimates for mining, processing, and infrastructure projects - Analyze drawings, specifications, proposals, and other documentation to prepare time, cost, materials, and labor estimate - Utilize RSMeans data and tools to develop accurate and benchmarked cost estimates - Collaborate with engineering, procurement, and project management teams to ensure accurate and comprehensive estimate - Develop and maintain cost databases, benchmarks, and estimating tools - Identify project risks and opportunities, providing mitigation strategies - Review and validate subcontractor and supplier quotes - Participate in bid reviews, value engineering, and project planning sessions - Provide ongoing cost analysis and support throughout the project lifecycle - Mentor junior estimators and contribute to continuous improvement initiatives - Support the PCM and Software Engineering teams in developing operating systems and tools to automate estimating processes What You'll Bring

Process Engineering Intern San Francisco HQ, San Francisco, California, US 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. The Role We are hiring a Process Engineering Intern to work on real, high-impact problems within the Pilot Plant Operations team in San Francisco. You will contribute directly to benchtop experiments, pilot plant test runs, and the creation of key plant operational programs, working closely with engineers and domain experts. This role is designed to provide hands-on experience building and shipping solutions, not just supporting tasks. What You'll Do - Drive experiments in the lab and pilot plant to de-risk scaleup of critical minerals processing steps - Build, test, and iterate on solutions to increase product recovery, decrease equipment downtime, controls costs, and improve health & safety - Collaborate with engineering, management, and software engineering to build programs and applications for Mariana's operations teams - Collaborate with cross-functional team members (engineering, operations, analytical lab, etc) - Present outcomes and learnings at the end of the internship Desired Qualifications - Currently pursuing or recently completed degree in chemical engineering, metallurgy, materials science, or a related field - Strong fundamentals in process design, thermodynamics, and reaction engineering - Hands-on experience in a laboratory, pilot plant, or commercial scale plant through previous projects, coursework, and/or internships - Ability

Extractive Metallurgist Moab, UT, Moab, Utah, United States 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. Join us as we build the future of mining and minerals refining. The Role We are seeking an Extractive Metallurgist to join our growing technical team in Moab, UT. This role will play a critical part in the development, optimization, and scale-up of mineral processing systems for Mariana's global operations. The ideal candidate brings strong process engineering and metallurgical expertise, ideally in zinc or copper, and thrives in fast-paced, startup environments where independence, creativity, and problem solving are essential. You'll work closely with operations, engineers, machine learning experts, and data scientists to develop innovative solutions that improve efficiency, recovery, and throughput across our projects. What You'll Do - Design, test, and optimize mineral processing flowsheets for new and existing projects. - Lead laboratory, pilot-scale, and plant trials for process validation and improvement. - Analyze metallurgical data to improve recovery, efficiency, and cost performance. - Collaborate with engineering teams on process design and scale-up. - Partner with data scientists and ML engineers to integrate advanced analytics and predictive models into process optimization. - Support commissioning and ramp-up of new facilities, with significant travel to sites. - Contribute to Mariana's culture of continuous improvement, innovation, and safety. What You'll

Sr. Plant Manager Houston, TX, Houston, Texas, US 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. The Role Mariana Minerals is seeking a highly motivated Sr. Plant Manager to lead the development and operation of our next-generation minerals processing pilot facility in Houston. You will be responsible for establishing and operating a first-of-its-kind pilot plant, including site setup, equipment design, construction, commissioning, start-up, and ongoing operations. You will help build and lead a multidisciplinary team of engineers and technicians to develop, test, and optimize innovative refining processes for critical minerals. This role serves as a critical bridge between R&D and commercial deployment, ensuring technologies are safely and effectively scaled from pilot to industrial production. What You'll Do - Lead the design, construction, commissioning, and startup of Mariana's Houston pilot plant facility. - Oversee day-to-day pilot plant operations to ensure safe, reliable, and efficient execution of minerals refining processes. - Oversee the design and execution of pilot-scale experiments to validate reaction parameters, optimize yields, and demonstrate process reproducibility. - Drive the creation and upkeep of process documentation including PFDs, P&IDs, mass/energy balances, and operating procedures. - Recruit, build, and manage a team of engineers and technicians to support pilot plant development and operations. - Collaborate with R&D, engineering, and commercial design teams to scale

Mechanical Maintenance Technician San Francisco HQ, San Francisco, California, US 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. The Role Mariana Minerals is looking for a highly motivated Mechanical Maintenance Technician to join our San Francisco Pilot Plant team. You will support the design, installation, and maintenance of first-of-its-kind refining processes for critical minerals. This position plays a critical role in bridging R&D and Operations, ensuring our equipment and work processes are robust, safe, cost-effective, and suitable for commercial production. What You'll Do - Perform preventive and corrective maintenance on plant equipment including pumps, valves, piping systems, filtration units, and other process equipment. - Troubleshoot and repair mechanical issues to maintain safe and reliable plant operations. - Assist with fabrication, installation, modification, startup, and commissioning of new equipment and pilot plant systems. - Read and interpret engineering drawings, P&IDs, and equipment manuals to support maintenance and installation work. - Safely perform maintenance activities following plant safety procedures including Lockout/Tagout (LOTO), hot work permitting, and confined space entry. - Identify and maintain critical spare parts for the pilot plant - Champion the site Computerized Maintenance Management System (CMMS) system Desired Qualifications - Associate degree, technical certificate, or equivalent hands-on experience in industrial maintenance, mechanical technology, millwright work, or a related field. - 3+ years

Contract Electrical & Instrumentation Designer remote, San Francisco, California, United States 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 how minerals are sourced, refined, and optimized by combining deep industrial expertise with software, automation, and data-driven decision-making. Join us as we build the future of responsible mineral sourcing and supply. Role Overview Mariana Minerals is looking for a Contract Electrical & Instrumentation Designer to work on building the critical minerals supply chain. As an Electrical & Instrumentation Designer at Mariana Minerals, you will lead the configuration of projects in AutoCAD Electrical (or similar software packages), develop best practices and workflows for drafting and modeling, and support drafting and modeling activities from conceptual engineering through to detailed design. What You'll Do - Configure new projects in AutoCAD Electrical - Setup project databases, symbol libraries, and drawing templates - Draft single-line diagrams (SLDs) and electrical one-lines - Configure and draft schematic wiring diagrams, loop drawings, and instrument location plans - Develop and draft cable tray and conduit routing layouts, grounding plans, and instrument index lists - Define requirements for third party electrical equipment models, vendor schematics, and instrument datasheets to integrate into Mariana Minerals hosted AutoCAD Electrical environment - Define requirements for third party EPC companies to complete detailed engineering What You'll Bring - 5+ years of experience with AutoCAD Electrical - CAD admin experience - 2D drafting experience. SLDs, schematics,

Chemical Engineering Intern Moab, UT, Moab, Utah, United States 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. The Role We are hiring a Chemical Engineering Intern to work on real, high-impact problems within the Operations team. You will contribute directly to commissioning a first-of-a-kind copper scrap recycling plant, working closely with engineers and domain experts. This role is designed to provide hands-on experience building and shipping solutions , not just supporting tasks. What You'll Do - Assist in commissioning pilot equipment - Operate pilot plant to perform various process tests and performance evaluations - Collaborate with cross-functional team members including engineers and operators - Present outcomes and learnings at the end of the internship Desired Qualifications - Currently pursuing a degree in Chemical Engineering or Metallurgy - Strong fundamentals in fundamental knowledge, data recording, organization and analysis, and equipment operation/maintenance - Hands-on experience with processing equipment - Ability to break down problems and execute independently - Clear communication and willingness to learn - Willingness to work both day & night shifts with operators and engineers Why Join Us? At Mariana Minerals, you'll be part of a mission-driven team reshaping the way critical minerals are sourced and supplied globally. You'll have the autonomy to make big decisions, the tools to innovate, and a culture

Senior Full Stack Software Engineer San Francisco HQ, San Francisco, California, US, Houston, TX, Ann Arbor, MI, Moab, UT 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. Join us as we build the future of responsible mineral sourcing and supply. Role Overview Mariana Minerals is looking for an experienced Senior Full Stack Software Engineer to lead critical technical initiatives in building the next-generation critical minerals supply chain to support the world's energy transition. As a Senior Full Stack Software Engineer at Mariana Minerals, you will architect, lead, and deliver software systems that accelerate the engineering and construction of physical infrastructure critical to building the minerals supply chain. You will drive technical strategy, mentor team members, and own end-to-end delivery of complex systems. Key responsibilities include designing and implementing robust integrations with existing engineering and construction software tools, architecting scalable solutions to address pain points identified by Mariana's internal teams, leading cross-functional collaboration with ML engineers to integrate LLMs for unstructured data challenges, and spearheading the development of a new "operating system" for the engineering, construction, and operation of Mariana's mineral processing facilities. This is a truly full-stack role where you'll be expected to write production-quality frontend code while also demonstrating deep understanding of system design and backend architecture. You'll move seamlessly between user

Sr. Electrical Engineer San Francisco HQ, San Francisco, California, US, Houston, TX 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 how minerals are sourced, refined, and optimized by combining deep industrial expertise with software, automation, and data-driven decision-making. Join us as we build the future of responsible mineral sourcing and supply. Role Overview Mariana Minerals is seeking a highly motivated Sr. Electrical Engineer to support the design and implementation of power systems that enable the build-out of critical mineral infrastructure vital to the global energy transition. In this role, you will lead and contribute to the development of high, medium, and low voltage electrical distribution systems for first-of-its-kind chemical refining processes. Your work will span the full project lifecycle-from conceptual studies to detailed design, construction, commissioning, and energization. You will also be responsible for system modeling and analysis, ensuring that power systems are robust, reliable, and compliant with applicable standards. What You'll Do - Design and develop power distribution systems across high, medium , and low voltage networks for industrial infrastructure projects. - Produce and review single-line diagrams (SLDs), panel schedules, wiring diagrams, grounding plans, conduit/cable schedules, and equipment specifications. - Perform power system studies including: - Load flow and voltage drop analysis - Short circuit analysis - Arc flash hazard assessment - Protective device coordination - Select and specify electrical equipment such as transformers, switchgear, motor control centers

Sr. Technical Program Manager Moab, UT, Moab, Utah, United States 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 how minerals are sourced, refined, and optimized by combining deep industrial expertise with software, automation, and data-driven decision-making. Join us as we build the future of responsible mineral sourcing and supply. The Role Mariana Minerals is looking for a Sr. Technical Program Manager to join its Engineering team, to lead the delivery of a mining project at its Copper One subsidiary in Utah. This role will be instrumental in bridging initiatives and workstreams across R&D, piloting, existing operational infrastructure, engineering, construction, environmental, finance, and more. What You'll Do - Own the integrated project execution plan, master schedule, cost estimate, and risk register - Facilitate program meetings and ensure clear action tracking and progress on task statuses - Manage interfaces between all technical disciplines, contractors, and site operations - Translate geological uncertainty into project risk, contingency, and study scope - Ensure clear alignment on metallurgical test work, R&D programs, and pilot plant campaigns to de-risk the flowsheet - Direct engineering consultants and internal teams through studies and trade-offs (mining method, process route, throughput, utilities) - Oversee detailed engineering, procurement, and contractor performance - Translate permit conditions into design requirements, schedule constraints, and cost - Own the project business case, capital and operating estimates, and economic model inputs - Present funding requests and

Process Modeling Engineer San Francisco HQ, San Francisco, California, US, Houston, TX 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 how minerals are sourced, refined, and optimized by combining deep industrial expertise with software, automation, and data-driven decision-making. Join us as we build the future of responsible mineral sourcing and supply. The Role Mariana Minerals is seeking a highly motivated Process Modeling Engineer to support the development of next-generation refining processes for critical minerals - key to enabling the world's energy transition. In this role, you will be responsible for developing, validating, and optimizing heat and material balance models using tools such as ASPEN Plus/HYSYS, SysCAD, OLI Studio, or METSIM. You will work closely with R&D, pilot operations, and project execution teams to translate lab and pilot data into robust, scalable process models that drive the design of first-of-a-kind mineral refining facilities. What You'll Do - Develop steady-state and dynamic process models to establish heat and material balances for integrated mineral refinery systems using ASPEN, SysCAD, OLI, or METSIM. - Automate equipment and process sizing (reactors, heat exchangers, filters, crystallizers, evaporators, and separators) based on model outputs, linking models to datasheets and other engineering tools - Develop and maintain process simulation databases, ensuring consistency and traceability between modeling assumptions, test data, and engineering deliverables. - Calibrate and reconcile models using pilot or plant operating data to ensure model fidelity

Staff Program Manager Moab, UT, Moab, Utah, United States 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. The Role Mariana Minerals is looking for a Staff Program Manager to join its Business Operations team, to support operational execution and drive continuous improvement at its Copper One subsidiary in Utah. This role will be instrumental in bridging operational excellence with digital transformation at Mariana's first operating mine. What You'll Do - Operational performance management : Develop performance metrics and implement data collection and reporting processes to track performance against site and company goals. - Business process improvement : Work with functional leaders to identify areas for operational improvement and to design and implement processes to optimize efficiency across various functions, including finance, maintenance, supply chain, environmental, and safety. - Site digitization and change management : Use an understanding of the site's operational workflows to inform development of internal digital tools and technology platforms. Drive adoption and continuous improvement of new digital tools across the site. - Site program management : Own operational cadence for site leadership, including leadership meetings and reporting practices. Drive improvements to internal communications practices to ensure timely information flow between operational teams, site leadership, and company leadership. Desired Qualifications - 5 years in business operations or program management; experience in

Senior Process Controls Engineer Houston, TX, Houston, Texas, US, Moab, UT 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 Process Controls Engineer to work on building the critical minerals supply chain. As the Process Controls Engineer at Mariana Minerals, you will lead the development and deployment of first-of-its-kind chemical refining processes, while also playing a critical role in the development of software for capital project execution and automated plant optimization. Responsibilities will include leading equipment and plant-wide controls infrastructure and programming scopes from concept through to design, installation, commissioning, ramp, and handover to the operations team, and supporting the buildout of an in-house engineering team. What You'll Do - Develop standards for controls programming - Lead equipment scopes from concept and modeling validation, through procurement, engineering, fabrication, installation, commissioning, and ramp - Manage external equipment providers, technology licensors, and engineering companies to deliver fully integrated and functional mineral refining scopes - Drive cross-functional teams of lab technicians, pilot plant engineers, process engineers, and project engineers to lead the technical equipment scale-up and de-risk the commercialization of novel mineral refining processes - Support the hiring, mentorship, and day-to-day management of junior process engineers - Develop technoeconomic models of new project opportunities, acquisition targets, and

Sr. Geotechnical Engineer Houston, TX, Houston, Texas, US, San Francisco HQ, Moab, UT 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. The Role Mariana Minerals is seeking a Sr. Geotechnical Engineer to support mine development, infrastructure design, and operations across open pit and underground mining projects. This role provides geotechnical expertise throughout the full project life cycle-from early-stage studies and site characterization through construction, operations, and closure. In this role, you will develop and maintain geotechnical models, perform stability analyses, and support safe, efficient mine designs. You will work closely with geology, mine planning, mining engineering, and infrastructure teams to ensure geotechnical considerations are fully integrated into mine layouts, schedules, and operating strategies. This is a hands-on technical role suited for an engineer with strong technical fundamentals who is comfortable working across office, site, and field environments. What You'll Do Site Investigation & Ground Characterization - Plan and execute geotechnical investigations including drilling, test pits, core logging, sampling, and in-situ testing - Interpret geotechnical, structural, and hydrogeological data to develop site-specific ground and rock mass models - Coordinate and review laboratory testing programs for soil and rock mechanics Open Pit Geotechnical Design - Perform slope stability analyses for open pits, waste dumps, leach pads and stockpiles - Provide geotechnical inputs to mine layouts,

Lead Resource Geologist Houston, TX, Houston, Texas, US, San Francisco HQ 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. The Role Mariana Minerals is seeking a Lead Resource Geologist to support resource development, mine geology, and technical studies across open pit and underground mining projects. This role will contribute directly to geological interpretation, resource modeling, and grade control inputs that underpin mine planning, engineering, and economic evaluation. In this role, you will work closely with mine planning, mining engineering, and operations teams to ensure geological models are technically sound, practical, and aligned with mining realities. You will apply hands-on experience in nickel and copper systems to support resource growth, model refinement, and operational decision-making across multiple stages of project development. This role is ideal for a geologist with solid field, modeling, and operational experience who wants to demonstrate technical excellence and impact in a fast-moving, project-driven environment. What You'll Do Geological Modeling & Interpretation - Own geological and mineral resource model governance, including assumptions, documentation, uncertainty, and technical defensibility - Build, update, and maintain geological and resource models supporting open pit and underground mine designs and economic evaluation - Interpret lithology, structure, alteration, and mineralization using drilling, mapping, and sampling data - Define and apply domain-based modeling approaches and geostatistical methods appropriate for

Sr. Metallurgical Process Engineer Moab, UT, Moab, Utah, United States 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 how minerals are sourced, refined, and optimized by combining deep industrial expertise with software, automation, and data-driven decision-making. Join us as we build the future of responsible mineral sourcing and supply. Role Overview Mariana Minerals is seeking a highly motivated Sr. Metallurgical Process Engineer to support process development activities & scale-up experiments at our CopperOne mine outside of Moab, UT. You will oversee engineering and operations of our bioleaching columns and other pilot scale equipment supporting current and future mine projects. This role is highly hands-on and will play a key role in bridging R&D and operations, helping scale technologies from laboratory development through pilot demonstration and ultimately to commercial mining. You will work closely with R&D, technicians, metallurgists, and cross-functional teams to ensure processes are robust, efficient, and suitable for future development & scale-up. What You'll Do - Operate, troubleshoot, and improve leaching columns and other pilot-scale processing equipment in collaboration with technicians - Design and execute pilot-scale experiments to bridge learnings between R&D and commercial mine scale - Develop and maintain key process documentation including PFDs, P&IDs, operating procedures, mass balances, etc - Analyze experimental and operational data to identify opportunities for process optimization and scale-up - Support development of automated monitoring and optimization tools in collaboration with software

Machine Learning Engineer Ann Arbor, MI, Ann Arbor, Michigan, United States, San Francisco HQ, Houston, TX 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. The Role Mariana Minerals is building the critical minerals supply chain from the ground up-and we're looking for Machine Learning Engineers to help make it autonomous. We're not a software company selling tools to mining operators. We are a mining company that builds software. Mariana designs, builds, commissions, and operates our own mines and refineries. We develop proprietary chemical processes and run them at lab, pilot, and commercial scale. Today, we're producing battery-grade lithium salts from real oil and gas wastewater in our facilities. Our first commercial-scale lithium production facility, Lithium One, is targeting initial production in Q1 of 2027. As a Machine Learning Engineer at Mariana, you'll help build and improve the machine learning systems that control our mineral refining facilities. You'll start with well-scoped problems inside our simulators and training pipelines-and ramp quickly toward owning models that run on real, operating plants. Your work won't live behind dashboards or proxy metrics; you'll see its impact in real recovery rates, energy consumption, reagent usage, and uptime. The Tech This is some of the most interesting applied AI work happening today. Our internal platform uses the same reinforcement learning

Staff Machine Learning Engineer Ann Arbor, MI, Ann Arbor, Michigan, United States 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. The Role Mariana Minerals is building the critical minerals supply chain from the ground up-and we're looking for a Staff Machine Learning Engineer to help make it autonomous. We're not a software company selling tools to mining operators. We are a mining company that builds software. Mariana designs, builds, commissions, and operates our own mines and refineries. We develop proprietary chemical processes and run them at lab, pilot, and commercial scale. Today, we're producing battery-grade lithium salts from real oil and gas wastewater in our facilities. Our first commercial-scale lithium production facility, Lithium One, is targeting initial production in Q1 of 2027. As a Staff Machine Learning Engineer at Mariana, you'll set the technical direction for how we make refining autonomous. You'll define how control models are built, validated, and trusted on live equipment across our circuits and facilities-and you'll personally take on the hardest modeling problems standing between us and fully autonomous operations. Your decisions will show up in real recovery rates, energy consumption, reagent usage, and uptime across every plant we run. The Tech This is some of the most interesting applied AI work happening today. Our internal platform, uses the

Sr. Data Engineer Ann Arbor, MI, Ann Arbor, Michigan, United States, Houston, TX, San Francisco HQ 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. The Role Mariana Minerals is building the critical minerals supply chain from the ground up-and we're looking for a Senior Data Engineer to help make it autonomous. We're not a software company selling tools to mining operators. We are a mining company that builds software. Mariana designs, builds, commissions, and operates our own mines and refineries. We develop proprietary chemical processes and run them at lab, pilot, and commercial scale. Today, we're producing battery-grade lithium salts from real oil and gas wastewater in our facilities. Our first commercial-scale lithium production facility, Lithium One, is targeting initial production in Q1 of 2027. As a Senior Data Engineer at Mariana, you'll own a data domain end-to-end-designing the pipelines, schemas, and contracts that make a whole class of plant data trustworthy and queryable. The systems you build are the foundation every model and every operational decision depends on. The Tech This is some of the most interesting applied data work happening today. Our internal platform, PlantOS, uses the same reinforcement learning toolkits that power self-driving vehicles and humanoid robots-but applied to autonomous, short-interval control of mineral refining circuits. None of it works