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 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