Boffa (Chalco Guinea): a bauxite operation in Guinea

Boffa (Chalco Guinea) is a mine producing bauxite in Boffa, Guinea, operated by Chalco. The sources report 1,961 10,000 tonnes (万吨), annual output for CY2025; the basis is Whole mine as listed in the company's table of own mines; equity basis not stated. The sources do not give a whole-operation figure in bauxite that can be compared with world output, so no share is computed.

Who owns and operates it?

Owners of Boffa (Chalco Guinea)
Owner	Interest	As of
Chalco (operator) The annual report lists Boffa among the company's own mines and states that its subsidiary Chalco Guinea is controlled by Chalco Hong Kong. The ownership percentage is not printed.	—	31 December 2025

Interests are as stated in the sources below on the date shown. Ownership changes with deals, so a stake may have changed since the date shown.

How much does it produce?

Reported output of Boffa (Chalco Guinea)
Period	Output	Basis	Where in the source
CY2025	1,961 10,000 tonnes (万吨), annual output The annual report does not say whether tonnes are dry or wet. Its note says resources and reserves in the table do not account for equity; the basis of the output column is not stated.	Whole mine as listed in the company's table of own mines; equity basis not stated	PDF p.31, 'Own mines' table (自有矿山的基本情况), row 博法矿, column 年产量(万吨) (annual output); the column total 3,540.42 equals the sum of the rows · Aluminum Corporation of China Limited (中国铝业股份有限公司)

Status: operating, as of 31 December 2025.

For comparison the Ministry of Mines and Geology of Guinea prints production by CHALCO of 5,411,629 t (first quarter), 5,031,527 t (second quarter) and 4,448,328 t (third quarter) of 2025, and 14,251,374 t for calendar 2023; the ministry's company label CHALCO is not explained in the bulletins.
The Chalco report lists international operating risk as something that could adversely affect the supply of its overseas bauxite resources (risk section, PDF p.36).
Alumina refineries and aluminum smelters are separate from this bauxite mine entry.
Chalco's report does not say whether the figure is on a dry or wet basis or on an equity basis, so no share of world output is computed.

How does it compare?

Other bauxite operations on this site: Weipa (including Amrun), Gove, Porto Trombetas (Mineracao Rio do Norte), Sangaredi (Compagnie des Bauxites de Guinee), Societe Miniere de Boke (SMB), Pingguo, Shanxi New Materials mines (merged line), Darling Range (Huntly and Willowdale), Juruti, Pocos de Caldas, Paragominas, Panchpatmali bauxite mines. In Guinea: Sangaredi (Compagnie des Bauxites de Guinee), Societe Miniere de Boke (SMB). See where bauxite comes from for the country totals, the country page for Guinea, and Chalco for its other operations here.

Sources

Aluminum Corporation of China Limited (中国铝业股份有限公司): 2025 Annual Report (Chinese; 中国铝业2025年年度报告全文) (annual report (SSE filing, disclosed on cninfo.com.cn 2026-03-28), FY2025 (calendar)). Opened 4 November 2026; used: PDF pp.1, 6, 7, 9, 10, 15, 30, 31, 36.
U.S. Geological Survey: Mineral Commodity Summaries 2026: Bauxite and Alumina (government statistical summary, 2025 (world and country bauxite mine production)). Opened 3 November 2026; used: world mine production and reserves table.

Method and limits

Reported, not estimated. Output is the figure the operator or owner published, in the unit it used. This site does not estimate output where none is published.
Shares. A share divides output in bauxite by the USGS world or country total for 2025. Where the operator's year is a fiscal year or the unit is a concentrate or a carbonate equivalent, the share is approximate or not given.
What is compared. Operators print tonnes of bauxite on a dry or wet basis, or do not say which. USGS bauxite mine production is in dry tonnes, so where the basis differs or is not stated the share is indicative.
Whole operation or owner's share. The basis column says which. A joint venture's output is never counted twice.
Partial list. Only operations with a published figure are listed, so the rank is among those on this site, not among every bauxite mine. Shares of a country's output mix periods and bases, so treat them as indicative.
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