⚠ The Partner Runs the MineModerate threat

Marubeni (8002) — threat to the moat

Marubeni's copper is one relationship in one country, and the relationship's other party makes every decision.

Every operating decision at Centinela and Antucoya is Antofagasta's to make1. When the Chilean copper stake had to be written down by ¥60.3 billion in the year to March 20202, Marubeni's role was to record the loss.

Gross risk exposure by country, March 2026 (¥ bn)Japan1,563.5United States1,368.3Chile677.2Australia450.7Marubeni Integrated Report 2026, corporate data
Chile is the third-largest exposure, and almost all of it is copper operated by one company.

The dependency runs in both directions but not equally. Antofagasta needs partners' capital for expansions; Marubeni needs Antofagasta for any copper at all, because 160,000 tonnes of equity capacity3 is almost entirely one relationship. Chile is also Marubeni's third-largest country exposure after Japan and the United States, at ¥677.2 billion gross4.

The partnership has been through the worst of it together: the 2016 and 2020 impairments were both on the Chilean copper business56, and Marubeni responded by adding to Los Pelambres rather than selling. That is the minority partner's only real lever — to put more money in or take it out — and it has chosen to put more in.

The falsifying event is a strategic change at the operator: a sale of a mine interest to another partner, a change in Antofagasta's control, or a Chilean royalty change that alters the arithmetic of the expansion.

References
  1. ReportedEvery operating decision at Centinela and Antucoya is Antofagasta's to make.
    Marubeni Corporation, full-year IR presentation for the fiscal year ended March 31, 2026 - resource asset table (stakes, capacities, partners and exposures), equity volumes, sensitivities to commodity prices and currencies, and the Middle East risk scenarios and risk-management framework. — FY to March 2026 · publ. 1 May 2026 · source ↗
  2. ReportedWhen the Chilean copper stake had to be written down by ¥60.3 billion in the year to March 2020, Marubeni's role was to record the loss.
    Marubeni Corporation, Summary of Consolidated Financial Results for the fiscal year ended March 31, 2020 - the net loss and the after-tax impairments on Gulf of Mexico oil and gas, Chilean copper, the UK North Sea, Aircastle and Gavilon. — FY to March 2020 · publ. 7 May 2020 · source ↗
  3. ReportedAntofagasta needs partners' capital for expansions; Marubeni needs Antofagasta for any copper at all, because 160,000 tonnes of equity capacity is almost entirely one relationship.
    Marubeni Integrated Report 2026, introduction and At a Glance - the company history from 1858 and the market positions the company states for its businesses. — 2026 · publ. 2026 · source ↗
  4. ReportedChile is also Marubeni's third-largest country exposure after Japan and the United States, at ¥677.2 billion gross.
    Marubeni Integrated Report 2026, Section 6 Corporate Data - the twelve-year financial summary (revenue, gross trading profit, operating profit, share of associates, net profit, adjusted net profit, EPS, dividends, ROE, ROA, net D/E, cash flows, total assets and equity), shareholder composition, employees and gross risk exposure by country. — FY to March 2015 - FY to March 2026 · publ. 2026 · source ↗
  5. ReportedThe partnership has been through the worst of it together: the 2016 and 2020 impairments were both on the Chilean copper business, and Marubeni responded by adding to Los Pelambres rather than selling.
    Marubeni Integrated Report 2017, financial section - goodwill and trademarks carried for Gavilon. — FY to March 2017 · publ. 2017 · source ↗
  6. ReportedThe partnership has been through the worst of it together: the 2016 and 2020 impairments were both on the Chilean copper business, and Marubeni responded by adding to Los Pelambres rather than selling.
    Marubeni Corporation, Summary of Consolidated Financial Results for the fiscal year ended March 31, 2020 - the net loss and the after-tax impairments on Gulf of Mexico oil and gas, Chilean copper, the UK North Sea, Aircastle and Gavilon. — FY to March 2020 · publ. 7 May 2020 · source ↗
Sources
Generated September 24, 2026