Global Sourcing Lead for Pre-Op Sites

Mariana Minerals; San Francisco (CA); On-site; USD 140,000 - 210,000; Full time

Job summary

Mariana Minerals is seeking a Global Sourcing Manager to own procurement for pre-operational sites and ensure supply agreements, vendor relationships, and coverage before go-live. You will translate project needs into contracts and drive sourcing opportunities across our portfolio, including operating supplies, reagents, and non-construction capex.

You will work with engineering, operations, and commercial teams to optimize contracts, lead RFQ processes, and manage first deliveries, with a focus

Qualifications

• 8–12+ years of procurement, project procurement, or capital purchasing experience in mining, industrials, chemicals, or related sectors.
• Bachelor's degree in engineering, materials science, chemistry, or a related technical field.
• Proven track record of owning pre-operational or greenfield site procurement from spec to first delivery.
• Strong technical background with ability to read specifications and engage with engineering teams.
• Excellent negotiation skills with a track record of securing favorable terms under time pressure.
• Highly organized with ability to manage multiple procurement workstreams across projects/sites.
• Comfortable operating with ambiguity and taking ownership.
• Proficient with software tools for project tracking, workstream management, and reporting.

Responsibilities

• Define procurement requirements for pre-operational sites; translate technical specifications into sourcing scope.
• Own end-to-end pre-operational procurement: qualify vendors, run RFQ and bids, negotiate pricing/terms, execute purchases, manage first deliveries.
• Procure operating supplies and consumables (including reagents and spare parts) and non-construction capital spend (including mobile equipment).
• Ensure contracts reviewed for policy compliance and enterprise-level alignment; flag clauses with broader implications.
• Own vendor relationships through the pre-operational phase; ensure clean handoff to on-site procurement.
• Support on-site procurement on complex purchases, high-value negotiations, and new project scope at existing sites.
• Lead cross-site consolidation sourcing events to identify volume-based savings opportunities.
• Contribute quote data and supplier information to pricing and market intelligence database.
• Coordinate across site and project teams to ensure continuity of supply through startup and into operations.

Skills

Procurement management

Vendor negotiation

Reading technical specifications

Cross-functional collaboration

Project tracking software

Education

Bachelor's degree in engineering, materials science, chemistry, or related technical field

Job description

Mariana Minerals is seeking a Global Sourcing Manager to own procurement for pre-operational sites and ensure supply agreements, vendor relationships, and coverage before go-live. You will translate project needs into contracts and drive sourcing opportunities across our portfolio, including operating supplies, reagents, and non-construction capex.

You will work with engineering, operations, and commercial teams to optimize contracts, lead RFQ processes, and manage first deliveries, with a focus