Mariana Minerals jobs

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

Contract Piping Designer 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 looking for a Contract Piping Designer to work on building the critical minerals supply chain. As a Piping Designer at Mariana Minerals, you will lead the configuration of projects in AutoCAD Plant 3D (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 Plant 3D - Setup Data Manager and Smart P&IDs - Draft process flow diagrams (PFDs) - Configure and draft smart piping and instrumentation diagrams (P&IDs) - Develop and draft plot plans - Define requirements for third party 3D equipment models and P&IDs to integrate into Mariana Minerals hosted AutoCAD Plant 3D environment - Define requirements for third party EPC companies to complete detailed engineering What You'll Bring - 5+ years of experience with AutoCAD Plant 3D - CAD admin experience - 2D drafting experience. PFDs, P&IDs, Plot Plans, etc. - 3D modeling experience. Piping design, isometric generation, etc. Why Join Us? At Mariana Minerals, you'll

Drilling Engineer, Exploration & Resource Automation 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 We are hiring a Drilling Engineer, Exploration & Resource Automation to help build and implement the automated drilling, sampling, QA/QC, and resource workflows inside MarianaOS. This role sits at the intersection of drilling, geology, resource estimation, field operations, and software product development. You will work closely with Mariana Minerals' software team to translate real-world exploration and drilling workflows into scalable software tools, automated systems, and practical field-to-model solutions. The focus is not only to execute drilling programs, but to help automate how those programs are planned, tracked, sampled, analyzed, reconciled, and optimized across greenfield, brownfield, infill, resource definition, and new drilling campaigns. The ideal candidate has a strong geology, drilling, resource modeling, and resource estimation background, plus a strong motivation to automate manual workflows and build better tools for technical teams. Experience with sediment-hosted copper, sandstone-hosted copper, red-bed copper, stratiform copper, or similar deposits is helpful, but not required. Experience creating products, internal tools, technical solutions, dashboards, workflows, or software-enabled processes is a meaningful asset. You will work on Copper One, a real sedimentary copper project

Hydrometallurgical Process 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 looking for a highly motivated Hydrometallurgical Process Engineer to work on building the critical minerals supply chain to support the world's energy transition. As a Hydrometallurgical Process Engineer at Mariana Minerals, you will lead the development and deployment of first-of-its-kind chemical refining processes, while also supporting development of software for capital project execution and automated plant optimization. Responsibilities will include leading equipment scopes from concept through to design, installation, commissioning, ramp, and handover to the operations team. What You'll Do - Lead hydrometallurgical process equipment scopes from concept development and modeling validation through procurement, detailed engineering, fabrication, installation, commissioning, and ramp-up - Manage external technology licensors, equipment vendors, and engineering partners to deliver fully integrated and performant hydrometallurgical refining systems - Develop detailed heat and material balances for complex hydrometallurgical process trains, including leaching, solution purification, solvent extraction/ion exchange, precipitation, crystallization, and residue handling - Build hydraulic models and process flow diagrams/P&IDs for hydrometallurgical circuits, ensuring operability, reliability, and safety - Create first-principles models of chemical reactors and unit operations (e.g., leach reactors,

Sr. Pyrometallurgical Process 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 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 Pyrometallurgical Process Engineer to help build the critical minerals supply chain supporting the world's energy transition. As a Pyrometallurgical Process Engineer at Mariana Minerals, you will lead the development and deployment of first-of-its-kind high-temperature refining and thermal processing systems. You will play a central role in designing, modeling, scaling, and commissioning pyrometallurgical unit operations, while supporting development of software tools for capital project execution and automated plant optimization. Responsibilities include leading equipment and process scopes from concept and modeling validation through detailed engineering, installation, commissioning, ramp-up, and handover to operations. What You'll Do - Lead pyrometallurgical process scopes from early concept development and thermodynamic modeling through procurement, detailed engineering, fabrication, installation, commissioning, and ramp-up - Develop detailed heat and material balances for high-temperature process trains, including drying, calcination, roasting, reduction, smelting, converting, slag cleaning, refining, and off-gas treatment - Design and validate thermal process flowsheets and PFDs/P&IDs for pyrometallurgical circuits, ensuring safety, reliability, and scalability - Build first-principles thermodynamic and kinetic models for high-temperature reactors and furnaces (e.g., rotary kilns, calciners, electric arc furnaces, submerged arc furnaces, reverberatory furnaces, flash smelters) to

Engineering Manager, Piping & Stress Analysis 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. The Role Mariana Minerals is looking for a highly motivated Engineering Manager, Piping & Stress Analysis, with experience managing a piping design department, completing pipe stress analysis, and developing and implementing pipe, pipe support, and valve specifications. Mariana Minerals is building the critical minerals supply chain to support the world's energy transition. As an Engineering Manager, Piping & Stress Analysis at Mariana Minerals, you will lead the development and deployment of first-of-its-kind chemical refining processes, while also supporting development of software for capital project execution and automated plant optimization. Responsibilities will include leading basic and detailed engineering strategies, managing external engineering firms, staff-aug contractors, and internal teams, developing issued-for-construction engineering packages for piping and static equipment. What You'll Do - Lead and manage a piping team of internal, staff-aug, high-value engineering center, and third party engineering firm piping designers - Oversee execution of piping engineering deliverables across multiple projects - Establish and maintain piping design standards, specifications, and best practices - Perform pipe stress analysis using Caesar II, including flexibility analysis, thermal expansion, and load cases - Conduct dynamic

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

IT Technician 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. 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. The Role The IT Technician will provide onsite technical support at a remote mine site, ensuring the reliability, security, and performance of all technology systems that support mining operations. This role supports endusers, network infrastructure, hardware, software, communication systems, and operational technology (OT) used in the field. The technician will troubleshoot issues, perform maintenance, manage equipment inventory, and work closely with the corporate IT team to maintain compliance with company standards. What You'll Do Technical Support & Troubleshooting - Provide onsite support for desktops, laptops, tablets, mobile devices, printers, and specialized mining equipment interfaces. - Diagnose and resolve hardware, software, and network issues in a highdemand, fastpaced environment. - Assist with installation, configuration, and updates of operating systems and applications. - Support minesite users with connectivity issues, authentication, VPN

Mechanical 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 Mechanical Engineering Intern to work on real, high-impact problems within the Pilot Plant Operations team in San Francisco. You will contribute directly to design, improvement, and optimization of benchtop pilot plant equipment, 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 - Create 3D models, layout drawings, and other critical documentation for equipment in the lab and pilot plant - Build, test, and iterate on hands-on mechanical solutions to improve equipment performance, 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, controls engineering, etc) - Present outcomes and learnings at the end of the internship Desired Qualifications - Currently pursuing or recently completed degree in mechanical engineering or a related field - Strong fundamentals in mechanical design documentation such as equipment specifications, layout drawings, piping schematics, and CAD models - Hands-on experience designing or supporting industrial equipment including pumps, piping systems, reactors, separators, filtration systems, and

Project Engineering Manager - Houston 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. The Role Mariana Minerals is looking for a highly motivated Project Engineering Manager to work on building the critical minerals supply chain to support the world's energy transition. In this role, you will manage design, tasks, and the flow of information across internal and external engineering teams for your assigned project(s). You will develop and maintain project workflows, lead project-specific design activities, support document control processes, managing engineering deliverables, coordinate cross-discipline reviews, manage approvals, and provide progress updates. What You'll Do - Manage engineering activities across internal engineering teams, external engineering partners, and vendors - Take a hands-on approach in developing project-level designs and associated documentation. - Manage review/approval workflows for engineering documents, vendor submittals, and project deliverables - Coordinate cross-discipline engineering reviews, ensuring timely engagement from process, mechanical, structural, piping, electrical, instrumentation, and construction teams - Track engineering deliverables and action items, maintaining up-to-date logs, trackers, and registers to ensure alignment with the project schedule - Lead technical interface management, resolving gaps and issues between disciplines, vendors, and EPC partners - Organize and lead model reviews, design reviews, and

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

RC Driller 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. 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. Summary The Reverse Circulation (RC) Driller operates RC drilling rigs to support mineral exploration and mining programs. The role focuses on safe, efficient drilling operations, highquality sample recovery, equipment care, and compliance with health, safety, and environmental standards in often remote work environments. Responsibilities - Safely operate Reverse Circulation (RC) drilling rigs in accordance with site procedures, manufacturer specifications, and regulatory requirements - Conduct thorough pre-start inspections of drill rigs, compressors, boosters, rods, hammers, and support equipment - Perform routine servicing, lubrication, and basic mechanical troubleshooting to minimize downtime - Accurately collar holes and maintain correct drilling angles, depths, and alignment per drilling plans - Monitor and adjust drilling parameters such as air pressure, rotation speed, bit wear, and penetration rate to optimize productivity and sample quality - Ensure

Safety Specialist/Engineer Moab, UT, Moab, Utah, United States Safety Specialist/Engineer Location: Copper One, Moab, UTAH 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. The Role We are seeking a Safety Specialist/Engineer to be responsible and accountable for the site's safety, health, and security, along with assisting in developing, implementing, and sustaining good safety and health practices for our team. This role is responsible to ensure that safety standards and procedures are followed by all mine personnel in compliance with company, state, and federal Mine Safety and Health Administration (MSHA) rules and regulations. Copper One is a 24/7/365 open pit mining operation with an excellent safety performance and compliance record. The ideal candidate combines OSHA and MSHA expertise and experience having acted as a Safety Specialist or Safety Engineer in mining operations. What You'll Do - Lead by example, in all safety processes, ensuring complete safe

Logistics Coordinator (Mining and Recycling Operations) 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. 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. SUMMARY The Logistics Coordinator is responsible for planning, coordinating, and overseeing the movement of materials, equipment, and supplies to and from the mine site to ensure uninterrupted mining operations. This role supports production, maintenance, and construction activities while maintaining compliance with safety, environmental, and regulatory requirements in a mining environment. RESPONSIBILITIES Logistics & Supply Chain - Coordinate inbound and outbound transportation of materials, consumables, spare parts, and heavy equipment. - Schedule and monitor deliveries to ensure materials arrive on time and in the correct quantities. - Inspect copper scrap received on site to ensure deliveries are correct. - Manage freight providers and carriers for deliveries to mine site. - Support warehousing, laydown areas, and on-site material handling activities. - Track shipments and resolve delays, damages,

Mine Maintenance Technician Moab, UT, Moab, Utah, United States About Mariana Minerals & Copper One Mariana Minerals is a growing natural resources company focused on developing and operating long-life copper assets in stable jurisdictions. Through its Copper One platform, Mariana Minerals owns and operates the Lisbon Valley Mining Company , a producing open-pit copper mine located in southeastern Utah. Lisbon Valley Mining Company utilizes modern surface mining methods-including drilling, blasting, loading, and hauling-to deliver ore to its crushing and heap leach processing facilities. Our success depends on safe, reliable equipment performance, supported by a skilled and safety-focused maintenance team. Position Summary The Mine Maintenance Technician plays a critical hands-on role in ensuring the reliability, safety, and performance of mobile mining equipment and supporting infrastructure. This position performs inspections, troubleshooting, repairs, and preventive maintenance on heavy equipment, support vehicles, and associated systems in both shop and field environments. The ideal candidate has strong mechanical aptitude, experience working in mining or heavy industrial environments, and a commitment to safe work practices. This role directly supports production by minimizing downtime, improving equipment health, and maintaining a safe and efficient operation. Key Responsibilities Equipment Maintenance & Repair - Perform mechanical, hydraulic, electrical, and pneumatic diagnostics and repairs on mobile mining equipment, including haul trucks, loaders, dozers, graders, and ancillary equipment. - Conduct preventive maintenance activities in accordance with OEM guidelines and established maintenance schedules. - Troubleshoot equipment failures, identify root causes, and implement effective corrective actions. - Service and repair auxiliary equipment such as

Staff Product Manager 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're hiring a Staff Product Manager to own a critical domain within MarianaOS. This is a single posting because we recruit for the strongest PMs first and then place them where the fit is best. Through the interview process, we'll figure out together which part of the system is the right match for your background and instincts. The scope of what we can touch is enormous. Mining is the last major industrial sector that hasn't been rebuilt with modern software. The opportunity set isn't a feature gap on an existing product - it's entire workflows and systems that don't exist yet. The problem space spans micron-scale chemistry to kilometer-scale infrastructure. Ship a feature and you can watch the needle move - recovery rates, reagent consumption, construction timelines, equipment uptime. These aren't proxy metrics. They're the actual physics of making metal. This role is On-site and will require significant travel. The Platform: MarianaOS MarianaOS is the digital nervous system for mineral projects. It spans the full lifecycle - from capital project execution through autonomous operations. The three domains make are staffing for right now are: - MineOS Integrates geologic block models, short and long-range

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,

Field 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 Field Engineering Intern to work on real, high-impact problems within the Project Execution Team. You will contribute directly to the construction of the Lithium One refinery, 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 the construction execution of a greenfield Copper One including working with subcontractors, vendors, scheduling and budgeting resulting in successful execution of scopes. - Build, test, and iterate on solutions within MarianaOS including developing world class tracking and development of a software driven construction team. - Analyze data and field systems to identify inefficiencies, track progress against schedule, and optimize construction performance. - Collaborate with cross-functional team members including engineering, operations, and construction contractors to coordinate scope and resolve field issues. - Present outcomes, key learnings, and recommendations to the Project Execution Team at the end of the internship. Desired Qualifications - Currently pursuing a degree in Civil Engineering, Construction Engineering, or Construction Management. - Strong fundamentals in construction sequencing, reading drawings and specifications, and basic project controls. - Hands-on experience in construction, scheduling, estimating, or

Project Controls Manager Houston, TX, Houston, Texas, US 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. Position Summary We are hiring a Project Controls Manager to drive the systems, processes, and tools that ensure successful delivery of large-scale capital projects across mining and refining. This is a hands-on leadership role at the intersection of cost engineering, scheduling, risk management, and financial governance . You will partner closely with project executives, managers, engineers, and contractors to establish control frameworks, optimize project performance, and deliver predictable outcomes. This role is central to scaling Mariana's capital project execution and embedding our software-first mindset into how projects are planned, monitored, and delivered. What You'll do: - Develop, refine, and implement project controls systems, processes, and tools (cost, schedule, change, risk, progress) across large-scale mining capital projects. - Champion improvements in the Capital Project Operating System (Capital Project OS) . - Review, analyze,

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

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

Process & Lab Technician 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 Process & Lab Technician to support the safe, efficient, and high-quality process development studies and analytical tests. In this role, you will work closely with R&D and engineering to build, operate, and maintain ore leaching columns. You will also be responsible for timely, accurate, and actionable chemical analysis of ore, process streams, and final products. You will play a critical role in bridging leaching research and laboratory analytics with plant operations, helping ensure processes are robust, efficient, and suitable for future development & scale-up. What You'll Do - Procure and construct columns and ancillary equipment used to measure copper leaching fundamentals - Drive leaching column operations including taking routine samples, troubleshooting equipment issues, and maintaining high level of cleanliness - Drive ore handling including crushing, sorting by particle size, and taking representative samples - Prepare samples for analysis using techniques such as digestion, dilution, and/or filtration - Perform elemental and compositional analysis of solid and liquid samples using ICP, NMR, XRF, Titrator, or similar analytical techniques - Document analytical results in laboratory information systems and maintain clear experimental records and material metrics using digital tools and software - Follow

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 -

Metallurgy Lead Moab, UT, Moab, Utah, United States Mariana Minerals is looking for a highly motivated Metallurgist to work on building back the domestic critical minerals supply chain. As a Metallurgist at Mariana, you'll play a critical role in supporting and optimizing our mineral processing operations across a range of unit processes, including heap leaching, solvent extraction and electrowinning (SX/EW), flotation, crushing, and milling. You'll work closely with operations, technical services, and project development teams to ensure high metal recoveries, efficient reagent use, and safe, compliant plant operations. This is a site-based role with regular exposure to both fieldwork and metallurgical analysis. Expect a fast-paced, hands-on environment where your contributions directly influence production and growth. What You'll Do Optimize Metallurgical Processes - Monitor and improve metallurgical performance across heap leach pads, SX/EW plants, flotation circuits, and comminution areas (crushing/milling). Identify bottlenecks, troubleshoot issues, and implement improvements to enhance throughput and recovery. Design and Execute Test Program - Plan and supervise metallurgical testwork (e.g., column leach tests, flotation tests, grinding studies). Interpret results to support operational changes or project decisions. Track and Report Metallurgical Performance - Conduct routine sampling, analysis, and metallurgical accounting. Maintain accurate records of metallurgical balances, recoveries, and plant efficiency metrics. Prepare internal reports and contribute to monthly technical summaries. Collaborate Across Teams - Work with operations, maintenance, and geology teams to integrate metallurgical insights into daily decision-making. Provide input to capital projects, equipment selection, and commissioning activities. Champion Safety and Compliance - Promote a strong safety culture