Mariana Minerals is a software-first, vertically integrated minerals company focused on supplying the minerals critical to modern energy, AI, and defense technologies. Backed by Khosla and a16z.
About the role
This role suits a hands-on hydrometallurgical/mechanical/chemical engineer who enjoys spending time in the plant, turning data into decisions, and seeing improvements through from idea to commissioning. Found on 1752vc Careers, the job board for startup and VC roles.
What they're looking for
- This role suits a hands-on hydrometallurgical/mechanical/chemical engineer who enjoys spending time in the plant, turning data into decisions, and seeing improvements through from idea to commissioning
- 2+ years of process engineering experience in commissioning of chemical factories, mechanical equipment knowledge or project/design upgrades
- Proven track record delivering process improvement projects with measurable results
More about this 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.
Act as the engineering owner of the SX and EW circuits, including mixer-settlers, organic and electrolyte handling, tank house, cell house and associated utilities.
Monitor daily plant performance (PLS grade and flow, extraction and stripping efficiency, phase continuity, entrainment, current efficiency, cathode quality) and act on deviations.
Define and maintain operating envelopes, control set points and alarm limits together with operations and control engineers.
Lead technical troubleshooting of process upsets such as crud formation, organic degradation, impurity build-up (Fe, Mn, Cl, NO₃), short circuits and poor cathode morphology.
Manage reagent strategy for extractant, diluent, smoothing agents and cobalt sulfate, including consumption tracking and supplier technical liaison.
Produce daily, weekly and monthly process performance reports and...
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