VANCOUVER — Marimaca Copper Corp. (TSX: MARI; ASX: MC2) has struck a binding option agreement to acquire a used sulfuric acid plant in Chile for $2.5 million, a strategic move that could cut input costs and shield operations from volatile acid markets. The deal, announced Thursday, comes as the company rides an extraordinary 184% share price surge over the past year, trading near a 52-week high of $8.43, according to InvestingPro data.
Acid Capacity to Cover up to 40% of Marimaca’s Demand
The facility, acquired from CEMIN Holding Minero, has a nameplate capacity of 150,000 tonnes per annum of concentrated sulfuric acid. That equates to roughly 30–40% of the Marimaca Oxide Deposit’s expected acid requirements, based on company filings. Sulfuric acid is a critical reagent in heap leaching and SX-EW copper operations, and securing supply is particularly relevant in Chile, where acid prices have been volatile due to demand swings and refinery shutdowns.
By integrating this used plant into its supply chain, Marimaca positions itself to mitigate procurement risks while creating a structural cost advantage. The company has committed to relocate the equipment to its designated site before June 30, 2026, following a three-month due diligence window.
Cost Advantage: $70 vs. $95 Per Tonne
Marimaca estimates that in-house acid production could lower reagent costs by nearly 30%. According to internal modelling, sulfuric acid produced from the refurbished plant would cost about $70 per tonne, versus market forecasts of around $95 per tonne from 2028 onward.
The contrast in capital expenditure is even starker. A new acid plant of comparable capacity would cost $35–40 million in equipment and $50–60 million fully installed, compared to the $2.5 million acquisition price plus relocation costs.
“This is an unusually capital-light entry point into securing one of our largest input costs,” Marimaca management noted in its release, adding that relocation and commissioning costs are expected to be “materially lower” than greenfield alternatives.
Acid Market Dynamics in Chile
Chile is the world’s largest copper producer, and sulfuric acid supply has been a recurring bottleneck. Over the past five years, demand has outpaced domestic production, particularly in northern Chile where oxide leaching projects are clustered. Supply tightness has pushed smelters and miners to secure long-term contracts, often at elevated pricing.
Earlier Skillings coverage highlighted how input cost volatility, particularly in acid and energy, is reshaping project economics across Latin America. For mid-tier players like Marimaca, reducing exposure to spot pricing can materially strengthen feasibility outcomes.
Governance and Shareholder Support
The transaction follows a strong show of confidence from shareholders at Marimaca’s recent Annual General Meeting. All eight directors were re-elected with near-unanimous support—between 99.73% and 100% of votes cast—and the appointment of auditors was approved. Roughly 51.9% of issued shares were represented, underlining engagement levels in the company’s governance trajectory.
This governance backing is crucial as Marimaca advances its Definitive Feasibility Study (DFS) for the Marimaca Oxide Deposit. While the acid plant acquisition will not be reflected in the DFS economics, the company has indicated it could meaningfully improve long-term operating costs and capital efficiency.
Transaction Details
The acquisition is structured as an asset purchase from CEMIN’s subsidiary, Administradora Industrial y Minera Pada SpA. Marimaca has already conducted a technical site inspection and reviewed independent engineering reports to confirm the viability of the asset, which has been on care and maintenance since 2015.
The deal terms include:
- $1 million upfront payment on signing.
- $1.5 million second tranche payable after the three-month exclusive due diligence period.
- Mobilisation and relocation to be completed before mid-2026.
Skillings Analysis
- Strategic hedge: By partially internalizing acid production, Marimaca gains resilience against supply squeezes that have hit other Chilean operators.
- Capital discipline: Acquiring a used facility at 5% of the replacement cost highlights pragmatic capital allocation in a rising cost environment.
- Investor optics: With the stock near its high and the DFS pending, the timing of this announcement may reinforce investor confidence in Marimaca’s ability to de-risk its project pipeline.
Outlook
Marimaca’s acid integration plan could set a precedent for mid-cap miners seeking cost resilience without overextending capital budgets. With the DFS due for release in the coming weeks and construction decisions expected within the next 18 months, acid supply security will likely be a key factor in financing and execution planning.
For now, the move positions Marimaca to enter the second half of 2025 with a structurally lower cost base—critical ahead of the Christmas-cycle investment reviews that often shape institutional positioning in junior and mid-tier copper equities.
