Bisie Tin Mine: a tin operation in DR Congo

Bisie Tin Mine is a mine producing tin in Walikale District, North Kivu Province, DR Congo, operated by Alphamin Bisie Mining SA. The sources report 18,576 tonnes of contained tin ('Contained Tin Produced') for CY2025 (year ended 31 December 2025); the basis is 100% of the operating subsidiary, as reported by the operator. In tin content, whole-operation output for CY2025 is 18,576 tonnes: about 6.4% of world tin output in 2025 and about 69% of DR Congo's; it is one of 6 operations on this site whose output can be stated in tin content.

Who owns and operates it?

Owners of Bisie Tin Mine
Owner	Interest	As of
Alphamin Alphamin Resources Corp. holds an indirect 84.14% of Alphamin Bisie Mining SA (ABM), the subsidiary to which the mining permit on which the Bisie Tin Mine occurs relates.	84.14%	31 December 2025
DRC government Held in Alphamin Bisie Mining SA.	5%	31 December 2025
Industrial Development Corporation of South Africa Ltd (IDC) Held in Alphamin Bisie Mining SA.	10.86%	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 Bisie Tin Mine
Period	Output	Basis	Where in the source
CY2025 (year ended 31 December 2025)	18,576 tonnes of contained tin ('Contained Tin Produced') 752,357 t of ore processed at 3.3% Sn, overall plant recovery 75%. Contained tin sold was 18,638 t.	100% of the operating subsidiary, as reported by the operator	PDF p.2 (printed p.2), Production and Financial Summary table, row 'Contained Tin Produced', Year ended December 2025 column; text PDF p.3 and PDF p.6, Operating Activities · Alphamin Resources Corp.
CY2024 (year ended 31 December 2024)	17,324 tonnes of contained tin ('Contained Tin Produced')	100% of the operating subsidiary, as reported by the operator	PDF p.2, same row, Year ended December 2024 column · Alphamin Resources Corp.
Q2 2026 (quarter ended 30 June 2026)	5,013 tonnes of contained tin ('Contained Tin Produced') Quarter ended 31 March 2026 was 5,026 t.	100% of the operating subsidiary, as reported by the operator	PDF p.2, Operational and Financial Summary table, row 'Contained Tin Produced' · Alphamin Resources Corp.

Between CY2024 (year ended 31 December 2024) and CY2025 (year ended 31 December 2025) the reported figure rose by 7.2%, in the same unit and on the same basis.

How the tin-content figure is worked out. Alphamin reports 18,576 tonnes of contained tin produced at the Bisie Tin Mine in 2025. The MD&A states that its production and financial information is disclosed on a 100% basis, so the figure covers the whole operation. World mine production of tin in 2025 was 290,000 tonnes (USGS Mineral Commodity Summaries 2026); DR Congo produced 27,000 tonnes.

Status: operating, as of 30 June 2026.

The figure is contained tin produced (tin in concentrate), not sales. Contained tin sold in 2025 was 18,638 t. The all-in sustaining cost table in the same MD&A prints 18,575 t for tonnes of contained tin produced in 2025 (PDF p.8).
The MD&A says 2025 production was affected by a temporary cessation of operations on 13 March 2025 related to security concerns, with a phased restart from 15 April 2025 (PDF p.3 and p.8).
USGS prints 27,000 t of tin for Congo (Kinshasa) in 2025 (estimated).

How does it compare?

Other tin operations on this site: San Rafael, San Rafael B2 tailings reprocessing plant, Renison Tin Operation, PT Timah tin mining (company total), Yunnan Tin Company mines (company total), Huaxi Nonferrous tin concentrate (company total), Xingye Silver and Tin mines (company total). See where tin comes from for the country totals, the country page for DR Congo.

Sources

Alphamin Resources Corp.: Management's Discussion and Analysis for the years ended December 31, 2025 and 2024 (dated 11 March 2026) (annual MD&A (company website copy of the SEDAR+ filing), FY2025 (calendar), with 2024 comparatives). Opened 4 November 2026; used: PDF pp.1, 2, 3, 6, 8 (PDF page numbers equal printed page numbers).
Alphamin Resources Corp.: Management's Discussion and Analysis, Quarterly Highlights for the three and six months ended June 30, 2026 (dated 30 July 2026) (quarterly MD&A (company website copy), Q2 2026 and Q1 2026). Opened 4 November 2026; used: PDF pp.2, 3 (PDF page numbers equal printed page numbers).
U.S. Geological Survey: Mineral Commodity Summaries 2026: Tin (government statistical summary, 2025 (world and country mine production)). Opened 3 November 2026; used: world and country mine production 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 tin content 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.
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 tin mine. Shares of a country's output mix periods and bases, so treat them as indicative.
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