San Francisco, CA
Software-first critical minerals mining and refining
Mariana Minerals develops and operates projects to produce critical minerals like lithium and copper for energy, AI, and defense. It uses AI and software platforms for efficient, vertically integrated mining, extraction, and refining. This addresses supply chain shortages with faster, lower-cost domestic production.
The Senior Accountant supports close, reconciliations, general ledger accuracy, financial reporting, audits, and accounting process improvements across multiple entities. The role requires 3–6 years of accounting experience, strong GAAP knowledge, and ERP or accounting-system experience.
Leads accounts payable operations, vendor management, team development, internal controls, and procure-to-pay process improvement across multiple entities. Requires five or more years of AP experience, including supervisory leadership, with ERP and automation experience preferred.
The first dedicated designer for MarianaOS will simplify complex, data-heavy workflows used by operational teams, while shaping the product’s design system and visual direction. The role requires seasoned experience with complex products, strong cross-functional collaboration, user research, and AI-assisted prototyping.
Sources and engages exceptional technical talent for engineering and technical teams, partnering with recruiters and hiring leaders on difficult searches. Requires 5+ years of technical sourcing experience, strong research and outreach skills, and expertise with modern sourcing tools.
Designs and scales novel material synthesis processes from laboratory proof of concept through pilot and commercial production. The role requires a master's degree in a relevant engineering or chemistry discipline, hands-on synthesis and characterization experience, and expertise in process design and scale-up.
Coordinates shipping, receiving, warehouse operations, and inventory management for a San Francisco pilot plant. The role requires hands-on industrial or warehouse experience, familiarity with tracking systems, and the ability to safely handle materials and warehouse equipment.
Support process development and pilot-scale testing for bioleaching columns and mining equipment at a CopperOne mine pilot facility. Hands-on entry-level role involving experiment design, data analysis, documentation, and collaboration with R&D and software/ML teams. Requires a BS/MS in Chemical/Mining/Metallurgical Engineering with 0-2 years experience.
Lead technical services and mine operations for an open-pit copper mine, overseeing resource modeling, mine planning, pit optimization, grade control, drilling/blasting, and autonomous haulage to deliver production, grade, cost, and safety targets. Requires 12-15 years open-pit mining experience and a bachelor's in Mining Engineering or related field.
Lead the design, integration, and deployment of pilot-scale mechanical systems and processing equipment for a minerals refining pilot plant in Houston. Requires 9+ years experience in mechanical design, commissioning, and operations within minerals processing, chemicals, or oil & gas.
Develop, validate, and optimize steady-state and dynamic process models for critical minerals refining using tools like ASPEN, SysCAD, and OLI. Translate lab/pilot data into scalable designs, supporting R&D, operations, and techno-economic analysis for next-generation mineral facilities.
Global Sourcing Manager to own end-to-end pre-operational procurement for minerals mining sites, translating technical specs into contracts, qualifying vendors, negotiating terms, and managing supplier relationships for supplies, consumables, and non-construction capital equipment. Requires 8-12+ years procurement experience in mining/industrials with strong technical background.
Senior Mine Planner leading strategic long-range mine planning, multi-pit optimization, and portfolio evaluation to maximize NPV and guide capital allocation decisions for mining projects. Requires 5+ years experience with tools like Deswik/Whittle and expertise connecting technical plans to corporate strategy.
Support and scale hiring operations as a Recruiting Coordinator and Ops Specialist. Own interview scheduling, candidate communications, ATS data management in Ashby, process improvements, and metrics tracking for technical and business roles.
Lead structural steel drafting and modeling for capital projects using Tekla. Configure projects, develop 3D models and drawings (GA, fabrication, erection), define standards/workflows, and coordinate with multidisciplinary teams in heavy industrial environments. Requires 5+ years Tekla/structural detailing experience.
Mechanical Engineer leading design, build, and commissioning of mineral processing and metallurgical refining equipment for critical minerals facilities. Requires bachelor's in Mechanical Engineering, static equipment design, FEA proficiency, and experience with industrial standards like ASME/API.
Sr. HRBP/Generalist partnering with leaders on strategic HR matters including employee relations, performance management, organizational design, and workforce planning while managing day-to-day HR operations, onboarding, offboarding, HRIS, compliance, and employee engagement in a startup environment.
Build autonomy software and sensor integration for self-driving mining vehicles, covering perception, localization, mapping, planning, and controls. Requires 5-10+ years in robotics/autonomy, C++/Python, ROS, and hands-on sensor fusion experience.
Design and build electromechanical and robotic hardware for autonomous mining vehicles, including drive-by-wire actuation, motion systems, and robotic mechanisms. Requires 5-10+ years of experience with complex electromechanical or robotic systems and strong 3D CAD proficiency.
Lead end-to-end execution of capital project programs from development through construction, managing schedules, budgets, and cross-functional teams while driving adoption of project-management software tools. Requires 10+ years leading complex capital projects in mining, minerals, chemical, energy, or heavy industry.
Hands-on leader establishing project controls systems, schedules, budgets, and risk frameworks for large-scale mining capital projects. Requires 10+ years experience and Primavera P6 proficiency.
Staff ML Engineer setting technical direction for autonomous mineral refining using reinforcement learning and simulation. Owns modeling, validation, and deployment of control systems on live industrial equipment.
Build and deploy reinforcement learning models to autonomously control mineral refining facilities, optimizing recovery rates, energy use, and uptime in real operating plants.
Senior Data Engineer owning end-to-end data domains for industrial plant operations. Designs pipelines, schemas, and contracts from messy sensor/lab sources to support ML and operational decisions.
The Drilling Engineer, Exploration & Resource Automation will help build and implement automated drilling, sampling, QA/QC, and resource workflows. This role involves translating field workflows into software tools and optimizing drilling programs for critical mineral sourcing.
Manages engineering activities, design workflows, and cross-discipline coordination for critical minerals projects in EPC environments. Requires 7+ years experience, engineering degree, and proficiency in project tools and EPC processes.
Owns end-to-end product domains in MarianaOS, building software for mining operations, mineral processing, and business ops at the hardware-software-AI intersection. Requires 7+ years PM experience in physical/industrial systems, on-site presence, and significant travel.
Leads design, operation, and optimization of pilot-scale minerals processing equipment and experiments. Bridges R&D to commercial scale with 10+ years experience in chemical/process engineering and unit operations like leaching and electrowinning.
Provides onsite IT support at a remote mine site, troubleshooting hardware/software/network issues, maintaining OT equipment like PLCs and sensors, and ensuring system security and compliance for mining operations.
Leads geological modeling, resource development, and mine geology support for nickel and copper projects in open pit and underground operations. Provides technical inputs to mine planning and ensures compliance with reporting standards like NI 43-101 and JORC.
Leads architecture and delivery of full-stack software systems for minerals supply chain, integrating engineering tools like Autodesk, collaborating with ML engineers on AI features, and mentoring teams in a fast-paced startup environment. Requires 5+ years full-stack experience with modern frameworks and cloud platforms.