About the role
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 Mariana Minerals is seeking an experienced and detail-oriented Senior 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. Key
Responsibilities 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