Camino Puquios Mine Construction in Chile: 2026 Progress

The Quiet Revolution in Mid-Scale Copper Development

The global copper industry is undergoing a structural shift that few casual observers have fully registered. While headlines tend to focus on mega-projects and the output of mining giants, a quieter and arguably more agile class of development is gaining ground: mid-scale, low-capital-intensity copper projects in established Latin American jurisdictions. These are assets built not on billion-dollar infrastructure bets, but on geological selectivity, processing efficiency, and strategic partnership structures that compress both risk and time-to-production.

Against this backdrop, the Camino Puquios mine construction in Chile has emerged as one of the more technically coherent examples of this development model. Situated in Chile's Coquimbo Region near La Serena, Puquios is advancing through a critical pre-construction phase in 2026 that will determine whether it joins a growing list of heap-leach operations feeding cathode copper into a structurally undersupplied global market.

What Makes the Puquios Project Technically Distinctive

Deposit Classification and Processing Approach

Puquios sits atop a supergene porphyry copper system, a deposit type formed through the secondary enrichment of primary sulphide mineralisation via weathering and oxidation over geological time. This natural process concentrates copper oxides and secondary sulphides closer to the surface, which has significant practical implications for mining economics. Strip ratios tend to be more manageable, processing chemistry is well-understood, and the capital requirements for extraction are substantially lower than for conventional hard-rock sulphide operations.

The processing method selected for Puquios is heap-leach SX-EW, which stands for solvent extraction-electrowinning. This is a proven hydrometallurgical approach particularly well-suited to oxide copper deposits. Rather than crushing ore to fine particles and processing it through a concentrator, heap-leach operations stack crushed ore onto lined pads and irrigate it with a dilute acid solution. Copper-bearing solution is collected, processed through solvent extraction to purify and concentrate it, then passed through an electrowinning circuit that deposits pure copper cathode onto stainless steel blanks. The end product is 99.99% pure copper cathode, a directly marketable commodity that bypasses the smelting step entirely.

This is not a speculative processing pathway. SX-EW operations represent a well-established segment of Chile's copper output, with several large-scale operations across the country using identical or near-identical flowsheets. Furthermore, the Puquios copper project has been developed with this processing advantage firmly at its core.

Pre-Feasibility Study Economics at a Glance

The March 2025 Pre-Feasibility Study, prepared to NI 43-101 standards, provides the clearest picture of project economics. What stands out immediately is the conservative copper price assumption used as the modelling basis.

At US$4.25 per pound, the PFS copper price assumption sits well below the prevailing market environment in 2025 and 2026, where copper has traded above US$6.00/lb. This modelling conservatism is a deliberate feature rather than an oversight. A 23.4% post-tax IRR at US$4.25/lb implies that at current copper prices, the project's return profile would be materially higher, providing a significant buffer against cost overruns, schedule delays, or short-term price softness.

A pre-feasibility study modelled at conservative pricing functions as a built-in margin of safety. Every dollar of copper price above the modelled assumption flows disproportionately to project economics, compressing payback periods and expanding internal rates of return beyond what the headline IRR figure suggests.

Infrastructure and Logistics Advantages

Location matters enormously in mining economics, and Puquios benefits from several infrastructure advantages that reduce execution risk. The site sits within 2 kilometres of road access and approximately 140 kilometres from the Port of Coquimbo, a functional port with established logistics for mineral exports. Power infrastructure integration is planned as part of the construction scope.

Perhaps most importantly, all primary environmental and operational permits have been secured, including a recently approved waste dump expansion, which eliminates one of the most common sources of project delay in Chilean mining development. Early earthworks have already been initiated on-site, meaning the project is not starting from a greenfield condition at the time of construction commencement.

Construction Timeline and the Critical Financing Milestone

Where the Project Stands in Mid-2026

The most significant near-term variable is not technical but financial. Construction commencement is directly contingent on the initial drawdown of a Japanese debt financing package. Until that facility is formalised and drawn, construction cannot begin on its full-scale basis. This is a standard feature of large mining project structures, where lender due diligence, project finance documentation, and drawdown conditions must all be satisfied before capital flows to site.

Ausenco, the engineering firm engaged for detailed engineering work, brings a track record in mining infrastructure across Latin America. Their involvement at this stage signals that the project has progressed beyond conceptual design into the execution-ready phase, where procurement lists, construction sequencing, and contractor scopes are being refined.

In April 2026, executives from both Camino Minerals and Nittetsu Mining conducted a site visit to Puquios to review early works progress and coordinate the upcoming construction phase, a step that reflects active JV partner engagement rather than passive co-ownership.

The Leadership Architecture Assembled for Construction

Why Operational Appointments at This Stage Signal Real Intent

One of the more telling indicators of genuine construction readiness is the assembly of an in-country operational and financial leadership team before construction commences. Companies that are not genuinely advancing toward a build tend to defer these appointments until financing is locked. The fact that Camino has established a Santiago-based team ahead of the debt finalisation suggests a high degree of confidence in the financing outcome and a desire to compress the time between financial close and construction activity.

Marcelo Bruna: Operational Experience That Directly Mirrors the Puquios Flowsheet

Marcelo Bruna has been appointed General Manager of Cuprum SpA, the Chilean registered subsidiary through which the Camino-Nittetsu joint venture operates. His background spans more than 30 years of mine development and operations experience, with oversight of mining investments exceeding US$2.5 billion across large-scale projects.

What makes his appointment particularly notable is not the scale of his experience but its specificity. Bruna has recently been involved in operating a copper SX-EW mine in Chile, the same processing method and country in which Puquios will operate. This is not a generic mining executive appointment; it is a deliberate technical alignment between operational experience and project flowsheet. In the construction and commissioning phase of a hydrometallurgical operation, having leadership who has already navigated the practical complexities of SX-EW ramp-up in a Chilean context reduces execution risk in ways that cannot be fully quantified on a spreadsheet.

Building the Financial Infrastructure in Santiago

A dedicated financial team has been established in Santiago to manage JV accounting, project-level financial reporting, and coordination of the Japanese lender financing process. The decision to build this function in-country, rather than managing it from a Canadian or other offshore headquarters, reflects the operational seriousness of the construction push. Lenders and regulatory bodies generally respond better to local financial governance structures, and project finance documentation is more efficiently produced when the team responsible for it is embedded in the operating jurisdiction.

Darryl Steane: Corporate Development with Tier-One Pedigree

Darryl Steane has been engaged as a corporate development consultant, with a mandate focused on strategic growth, asset expansion, and technology development across Camino's Latin American copper portfolio. His career spans more than 20 years of international experience in project finance and mergers and acquisitions, including executive roles at BHP and South32, two of the world's most operationally sophisticated diversified mining companies.

His prior leadership of the Ambler Metals copper project in Alaska adds specific copper project development depth to a profile that already includes deep transaction and corporate finance experience. Consequently, his engagement signals that Camino is thinking beyond the Camino Puquios mine construction in Chile toward portfolio-level growth across its Latin American asset base. Details of these senior management appointments have been formally announced, underscoring the company's intent.

How the Japanese Financing Structure Works

Debt Architecture and the 70% Coverage Target

The financing structure being developed for Puquios targets debt coverage of 70% or more of the US$142 million initial capital cost, implying a debt component of approximately US$99 million or higher. The remaining equity portion would be funded through the joint venture partners. The package is being structured with a Japanese lending institution, with finalisation expected in mid-2026.

Two features of the anticipated financing structure deserve attention from an investor perspective:

• Competitive interest rates are anticipated given the nature of the Japanese institutional lending market and the Nittetsu Mining co-ownership structure
• No hedging requirement is expected, meaning the joint venture retains full exposure to copper price appreciation above the US$4.25/lb PFS model

The absence of a mandatory copper price hedge is significant. Many project finance packages for mining operations require borrowers to lock in a portion of future production at fixed prices to protect lender recovery. However, if Puquios can secure financing without this condition, the economics at current copper prices would flow fully to the JV partners.

The Nittetsu Mining Connection as a Financing Catalyst

The 50/50 partnership structure between Camino Minerals and Nittetsu Mining is more than a capital-sharing arrangement. Japan's industrial supply chains have a long-standing reliance on imported copper, and Japanese trading companies and mining firms have historically pursued upstream equity positions in copper assets as a form of supply security. Nittetsu Mining's co-ownership creates natural alignment between the project and Japanese capital market participants, including the lending institutions being approached for the debt package. This structural alignment is likely a material factor in the competitiveness of the financing terms being negotiated.

The convergence of a Japanese co-owner, a Japanese lending institution, and a no-hedging financing structure creates a capital architecture that is both efficient and strategically coherent for a project of this scale and type.

Copper Market Context: Why Puquios Matters Beyond Its Own Economics

Chile's Position in Global Copper Supply

Chile accounts for approximately 25 to 27% of global copper mine supply, making it the world's largest copper-producing nation. The Coquimbo Region, historically associated with iron ore and smaller-scale mining, is increasingly drawing attention as a zone for oxide copper development, partly because the geological conditions that favour supergene enrichment are well-represented across the region's porphyry systems.

The structural demand picture for copper is well-documented. Electric vehicles require three to four times more copper than internal combustion engine vehicles. Grid-scale battery storage, offshore wind installations, and data centre power infrastructure all represent copper-intensive demand categories that are growing faster than the broader economy. Against this backdrop, the supply side is under pressure: existing mines are aging, average ore grades at major operations are declining over time, and the discovery-to-production cycle for large new copper deposits has lengthened considerably.

Why Low-Capex, Fast-To-Production Projects Are Increasingly Valued

A 14-year mine life heap-leach operation with a sub-US$150 million capital requirement occupies a very different position in the project development landscape than a multi-billion-dollar sulphide project requiring a decade of permitting and construction. For investors and strategic partners focused on near-term copper supply contribution, the Puquios profile addresses a genuine market need. Industry analysts have noted that Camino is approaching near-producer status with construction actively underway, further reinforcing the project's credibility.

The exploration upside adds a further dimension. The 8-kilometre Diva corridor on the Puquios property represents potential for additional oxide mineralisation and, at depth, primary sulphide resources that could extend or expand the project's life significantly beyond the current PFS parameters. Deeper sulphide systems below supergene porphyry deposits are a well-recognised geological feature, though quantification of this potential requires further drilling.

Camino Minerals' Broader Copper Asset Portfolio

A Multi-Jurisdiction Latin American Platform

Puquios is the flagship construction-stage asset, but Camino Minerals holds a portfolio of copper-focused projects across Chile and Peru that collectively represent a pipeline of future optionality:

• Puquios (Chile): Construction-stage heap-leach SX-EW project, fully permitted, 14-year mine life
• Los Chapitos (Peru): Iron oxide copper-gold deposit, a deposit type that can carry economically significant gold credits alongside copper
• Maria Cecilia (Chile): Copper porphyry exploration project with resource expansion potential
• Plata Dorada (Chile): Early-stage copper asset within the broader portfolio

The deliberate focus on oxide and porphyry copper systems across two of South America's most copper-endowed jurisdictions provides a degree of geological and political diversification. Peru and Chile have different regulatory environments, different labour market dynamics, and different infrastructure contexts, meaning single-country operational risk is partially hedged across the portfolio.

Key Risks and Variables for the Construction Phase

Understanding the Risk Framework

No mining project at this stage is without meaningful risks. A clear-eyed assessment of the Camino Puquios mine construction in Chile requires examining both the mitigating factors and the scenarios in which the project timeline extends.

The financing timeline is the most immediate variable. If the Japanese debt package is not finalised in mid-2026 as anticipated, the construction start date moves accordingly, and the projected first-production timeline of approximately 2028 and beyond would shift to the right. This is not a project-specific weakness; it reflects the standard mechanics of project finance, where lender conditions precedent can introduce delays even in well-prepared transactions.

The Conservative Pricing Assumption as a Strategic Advantage

It is worth dwelling on the significance of the US$4.25/lb modelling assumption. At this price, the project delivers a 23.4% post-tax IRR. At copper prices above US$6.00/lb, which have prevailed through much of 2025, the project's economics improve substantially. The exact IRR at current prices would require an updated study to quantify, but the directional implication is clear: Puquios was not modelled to need elevated copper prices to work. Elevated prices simply make it work considerably better.

This positions the project as a leveraged exposure to copper price strength, without requiring speculative price assumptions to justify the underlying investment case. For investors evaluating the Camino Puquios mine construction in Chile, the modelling conservatism represents embedded upside rather than optimistic forecasting.

Disclaimer: This article contains forward-looking statements and financial projections based on pre-feasibility study assumptions. Actual results may differ materially from those projected. Copper prices are subject to market volatility. This content does not constitute financial advice. Readers should conduct their own due diligence before making any investment decisions.

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