Headquartered in Quebec, Canada, Dundee Sustainable Technologies specializes in extracting precious metals utilizing green technology. The company has developed and patented various green technologies that will change the face of mining forever.

Incorporated in 1997 as Nichromet Extractions, the company changed its named to Dundee Sustainable Technologies in 2014 to represent a new approach to processing.


New approach to processing

Dundee Sustainable Technologies is changing the way precious metals get processed. The company has developed a hydrometallurgical process utilizing green technologies for the extraction of metals from ore, concentrates and tailings.

“Cyanide is one of the main agents used to extract gold from ore,” says David Lemieux, executive vice president of Dundee Sustainable Technologies. “The problem with this chemical is it’s not environmentally friendly and has the potential to cause disaster.”

Read Our Digital Report

Click Here to Read



In recent years, several jurisdictions and countries including Mexico, Argentina and the United States have banned or restricted the use of cyanide. Environmental impacts have now become a decisional factor in many new mine projects and Dundee has found an answer.

The company’s patented green process for gold extraction utilizes chlorination instead of cyanidation, helping to provide a closed-loop process with recycling of reagents and water, eliminating the need for tailings ponds and the risks of containment collapse.

In addition, the new technology not only shortens the processing time of gold extraction (hours instead of days) but it also provides lower capital costs.

“The technology opens up opportunities for companies who can’t get permits and metallurgical licenses in their country,” says Lemieux. “Our technology meets the environmental regulations for countries around the world and has proven to be an environmental asset for mining companies.”

Over the last 10 years, Dundee has tested over 50 different gold deposits using chlorination instead of cyanide and tests have consistently shown gold recoveries are in excess of 90 percent. In addition, tailings from the process have proven to be de-voided of toxic substances and as a result meet environmental standards.

By using the same sustainable approach to gold extraction, the company has been able to develop other innovative technologies for the industry, including potassium and magnesium based fertilizers and environmental treatment of arsenic.

Dundee Sustainable Technologies has also tested a large variety of oxide and sulfide materials for extraction of nickel, cobalt, copper, zinc, gold and silver, in presence of high amount of magnesium, arsenic, and others,” says Lemieux.

“In most cases, the extraction yield was better than 90 % and the residues were neutral, stable and inert, according to the environment regulations.”

The success of the company’s sustainable technology has been catching on in the mining industry. Earlier this month, the company entered into an agreement with the Government of the Province of San Juan for the implementation of the green metallurgical technologies in Argentina. 

“Signing the MoU to implement the technology in Argentina is a great sign for the mining industry,” says Lemieux. “If you have the minister of mines agreeing with the technology then the industry should really open up and listen. It will help force the mining sector to focus on sustainability.”


Construction of plants

The partnership with Argentina is expected to bring great thing for Dundee. The company has been awarded $5.7 million in grants by the Government of Quebec and the Government of Canada for its demonstration plant at the Thetford Mines in Quebec.

“The big thing here is two governments have stepped in and helped us initiative green technologies within the mining industry,” says Lemieux. “That really gives our green technology a stamp of approval.”

The facility, which began in 2010 as a pilot plant, is currently being constructed to establish the optimal operating conditions for minerals to be treated. The $25 million demonstration plant, which will operate on a continual basis, will be used for testing materials from potential partners who are considering the application of Dundee Sustainable Technologies.

“We’re using the facility to demonstrate new ideas,” says Lemieux. “It will be a place to empower industry partners to test new technologies.”

When the plant becomes operational in 2015, the company will take up to 15 tons of gold concentrate per day from the mine operator over a 12-month period and over 300 tons of ore per day.

Other Companies

Newmont Corporation

Newmont: making technology the future of mining

Silvercorp Metals Inc.

Silvercorp maximizes opportunity at the Ying mining district

CRU Group

CRU Group: data-driven commodities digital transformation

IBM (Energy & Resources)

IBM: building a digital ecosystem to support the mine of the future

MST Global

MST Global: digital transformation for safety and efficiency in mining

Eramet Group

Eramet’s digital transformation tipping point


CRC ORE: promoting collaboration across the mining industry


New Century Resources: a vision for sustainable mining through a different lens


Shell & IBM introduce the Oren marketplace

African Underground Mining Services

African Underground Mining Services: The underground mining partner of choice

Compagnie des Bauxites de Guinee SA

TriStar Gold: transforming discoveries into world-class mining assets

Compagnie des Bauxites de Guinee SA

Compagnie des Bauxites de Guinée: Investing in bauxite mining Investing in Guinea’s future

Rainbow Rare Earths

Rainbow Rare Earths: Helping Burundi take advantage of green technology

Grande Côte Operations SA (TiZir Limited)

Grande Côte Operation’s Jozsef Patarica outlines his vision for the biggest mine of its kind

Swanson Industries

Swanson Industries: Digging deep to expand its mining footprint

Roy Hill

Australia’s Roy Hill maintains agility in mining

Mineral Technologies

Mineral Technologies: The art and science of separation

The Mining Chamber of Senegal

Serving Senegal: Inside Bassari Resources’ Makabingui gold project

Mining Global

KEFI Minerals: Striking gold with Ethiopian expertise

Mining Global

Nordgold: Russia’s gold standard

Read the latest issue

Click Here to Read