Cambior
Cambior was a Canadian international gold-mining company whose assets and operations were acquired by IAMGOLD in 2006.
Last updated August 26, 2026
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Overview
Cambior Inc. was a Canadian mining company focused principally on gold production, mine development, and mineral exploration in the Americas and other international markets. The company emerged in 1986 from the privatization of several important Quebec mining assets formerly associated with Soquem, the provincial Crown corporation. The assets transferred into the new company included the Doyon mine, Ressources Aiguebelle, Sullivan, and a 50 percent interest in the Niobec mine near Chicoutimi. This origin gave Cambior a substantial Quebec resource base while also establishing it as an internationally oriented mining group. Over time, Cambior operated and developed mines and exploration properties in several jurisdictions, including Canada, French Guiana, Guyana, Peru, Suriname, and Mali. Its principal business activities covered the full upstream mining cycle: exploration for mineral deposits, project development, mine operation, and production of gold. Cambior was not a consumer-facing product brand; its public identity was that of a publicly traded resource company whose value depended on mineral reserves, production assets, operating performance, commodity prices, and regulatory conditions. The company became internationally associated with the Omai mine in Guyana. In August 1995, a failure involving the mine's tailings dam released an estimated four million cubic metres of contaminated waste into the Essequibo River. Reports described the material as containing cyanide, heavy metals, and other pollutants. The incident resulted in extensive environmental damage, including reports of dead fish, and affected communities that relied on the river for drinking water, bathing, and fishing. At the time, Cambior held 65 percent of Omai Gold Mines Limited, with the remaining interest held by Golden Star Resources and the Government of Guyana. The incident generated litigation in both Canada and Guyana and became the defining controversy associated with the company. Cambior's legal exposure from the Omai spill continued for years. A proposed class action brought in Quebec was dismissed in 1998 because the court considered Guyana the more appropriate forum. Litigation in Guyana was subsequently dismissed in 2002, and a further action filed in 2003 seeking substantial damages was dismissed in October 2006. In 2002, Cambior acquired Golden Star's interest in Omai Gold Mines Limited, increasing its ownership of the operating company to 95 percent. Cambior's shares traded under the symbol CBJ on both the Toronto Stock Exchange and the American Stock Exchange, while its warrants traded on the Toronto exchange under CBJ.WT.C. The company ceased to exist as an independent listed business after IAMGOLD acquired 100 percent of its shares in November 2006. The transaction marked the end of Cambior as a standalone corporate brand and transferred its mining assets and operations into IAMGOLD's portfolio. Because Cambior was absorbed rather than continuing as an independently reported company, current information about its former properties is generally found in the historical records and successor disclosures of IAMGOLD and other asset owners.
History
Cambior was created in 1986 following the privatization of significant Quebec mining discoveries and assets previously held by Soquem, Quebec's Crown mining company. The assets transferred into the new enterprise included the Doyon mine, Ressources Aiguebelle, Sullivan, and half of the Niobec mine near Chicoutimi. This formation gave Cambior an initial base in Quebec and positioned it as a private-sector mining company with interests spanning production, development, and exploration. The company subsequently expanded beyond Quebec and Canada. Its portfolio and operating footprint included gold-related activities in French Guiana, Guyana, Peru, Suriname, and Mali, among other locations. Cambior's business model was based on assembling and operating mineral assets rather than marketing finished consumer goods. Gold production was its principal identity, although the company's historical asset base also included interests associated with other minerals and mining properties. The Omai mine in Guyana became Cambior's most prominent operation and its most consequential source of public controversy. In August 1995, a failure at the mine's tailings dam released an estimated four million cubic metres of waste into the Essequibo River. The released material was reported to contain cyanide, heavy metals, and other pollutants. The spill was followed by reports of extensive ecological harm, including dead fish, and raised serious concerns for approximately 23,000 people in surrounding communities who depended on the river for drinking water, bathing, and fishing. At the time of the accident, Cambior owned 65 percent of Omai Gold Mines Limited. Golden Star Resources and the Government of Guyana held the balance. A public-interest group brought a proposed class action in Quebec in 1997 on behalf of people affected by the spill. The Quebec Superior Court dismissed the case in August 1998, holding that Guyana was better placed to hear the dispute. A case filed in Guyana was dismissed in 2002. Another action filed there in 2003 sought damages of US$2 billion, but the Guyanese High Court dismissed it in October 2006 and ordered the plaintiffs to pay the defendants' legal costs. Cambior strengthened its position at Omai in 2002 by acquiring Golden Star's interest in Omai Gold Mines Limited. Its ownership consequently rose to 95 percent. The Omai dispute remained a significant part of the company's historical reputation, linking Cambior to questions about tailings management, environmental responsibility, transnational accountability, and access to remedies for affected communities. Cambior was publicly traded in Canada and the United States. Its common shares traded on the Toronto Stock Exchange and the American Stock Exchange under the symbol CBJ. Its warrants traded on the Toronto Stock Exchange under CBJ.WT.C. The company remained an independent mining group until IAMGOLD acquired 100 percent of its shares in November 2006. The acquisition ended Cambior's independent corporate existence and moved its assets and operations into the acquiring company's structure. By 2009, press coverage described Cambior as having disappeared as a standalone name. It is therefore best understood today as a defunct historical mining company and predecessor organization rather than an active brand.
- 2006
IAMGOLD acquires Cambior
[2]IAMGOLD acquired all Cambior shares in November, ending Cambior's independent corporate and stock-market identity.
- 2002
Cambior acquires Golden Star's Omai interest
[1]Cambior acquired Golden Star Resources' interest in Omai Gold Mines Limited and increased its ownership to 95 percent.
- 1998
Quebec class action dismissed
[1]The Quebec Superior Court dismissed litigation connected with the Omai spill on jurisdictional grounds.
- 1995
Omai mine tailings dam spill
[1]A tailings dam failure at the Omai mine released an estimated four million cubic metres of contaminated waste into Guyana's Essequibo River.
- 1986
Cambior is formed through Quebec mining-asset privatization
[1]Cambior was established following the privatization of major Quebec mining discoveries and assets formerly associated with Soquem, including Doyon, Ressources Aiguebelle, Sullivan, and a 50 percent Niobec interest.
Products and positioning
A publicly traded Canadian international mining company focused on gold production, mine development, and mineral exploration.
Precious-metals mining
Gold production
Gold production was Cambior's principal commercial activity. The company owned or operated gold mines and held interests in projects across the Americas and in West Africa. Its business included extracting and processing ore, developing new deposits, and managing the broader technical and operational requirements of mining assets.
Gold mine
Omai mine
The Omai mine in Guyana was one of Cambior's best-known assets. Cambior held 65 percent of the operating company at the time of the 1995 tailings spill and later raised its interest to 95 percent through the acquisition of Golden Star Resources' stake in 2002. The mine became central to Cambior's operating history and environmental controversy.
Mining assets · 1986
Quebec mining portfolio
Cambior's original portfolio included the Doyon mine, Ressources Aiguebelle, Sullivan, and a 50 percent interest in the Niobec mine near Chicoutimi. These assets came from the privatization of Quebec mining discoveries and formed the company's initial domestic foundation.
Mineral exploration
Exploration and development projects
Alongside producing mines, Cambior maintained exploration activities and development projects in several countries. These activities were intended to identify, evaluate, and advance mineral deposits for possible future production and complemented the company's operating mines.
Controversies
1995
Omai mine acid spill
A tailings dam failure at the Omai mine released an estimated four million cubic metres of waste containing cyanide, heavy metals, and other pollutants into the Essequibo River. The spill caused reported ecological damage and affected communities dependent on the river. It led to litigation in Quebec and Guyana and became the defining environmental controversy in Cambior's history.
Brand decisions
2006
Accept IAMGOLD acquisitionM&ABackground
Cambior was an established international mining company with operations, development projects, and exploration activities in multiple jurisdictions.
Action taken
IAMGOLD acquired 100 percent of Cambior's shares in November 2006.
Aftermath
Cambior ceased to operate as an independent listed company and its assets and operations were integrated into IAMGOLD.
2002
Acquire Golden Star's interest in Omai Gold MinesM&ABackground
Cambior already held 65 percent of Omai Gold Mines Limited, the company operating the Omai mine in Guyana. Golden Star Resources held another interest alongside the Government of Guyana.
Action taken
Cambior acquired Golden Star Resources' interest, raising its ownership of Omai Gold Mines Limited to 95 percent.
Aftermath
The transaction gave Cambior substantially greater control over the Omai asset and its associated operational and legal history.
Sources4 sources
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