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 Planner/Scheduler to own schedule management for one of Mariana's capital projects, from the Level 1 summary leadership uses to the Level 4 detail the field works from.

You will work with internal teams to build schedules that reflect how they actually plan to execute the work, build and defend the critical path, hold EPC contractors to a clear scheduling standard, and turn progress data into forecasts people can act on. You will also help build the tools behind that work, so leadership and project teams can run what-if scenarios, see where the schedule risk sits, and make decisions with real data in front of them. The goal is a schedule nobody has to second-guess.

What you'll do

• Own the integrated schedule. Build and maintain Level 1 through Level 4 critical path schedules in Primavera P6 covering engineering, procurement, fabrication, construction, commissioning, and start-up, and keep them integrated across owner and contractor scopes

• Set the structure. Define the work breakdown structure, activity codes, calendars, and resource and cost loading, aligned to the cost breakdown structure so cost and schedule reconcile

• Own the critical path. Run critical path, float, and near-critical analysis every cycle, state plainly which activities are driving the date, and recommend recovery options when they slip

• Control the baseline. Establish and maintain the baseline, run schedule changes through a documented change process, and keep the variance history intact

• Hold contractors to a standard. Review submitted schedules for logic quality, constraints, open ends, and float manipulation using a DCMA-style health check, and work findings to closure

• Measure progress. Define rules of credit with cost control, collect and validate progress, and produce S-curves, earned-value inputs, and workhour histograms that match what is happening in the field

• Drive the look-ahead process. Run ninety-day, six-week, and weekly look-aheads with construction and commissioning leads, and tie them back to the master schedule

• Support risk analysis. Build the schedule model for quantitative schedule risk analysis and translate P50 and P80 results into decisions on contingency and milestones