Eight miners at the Trevali's Perkoa nickel mine in Burkina Faso are still missing following the flooding of April 16.

There has been no communication with the workers since April 16, the company said.

Six of the workers are from Burkino Faso, while the others hail from Tanzania and Zambia, The Globe & Mail reported.

Search crews will continue to search "24 hours per day" for the missing miners, Trevali said.

Trevali has removed approximately 32 million litres of water from the mine, with access restored to level 550. The workers are believed to have been on this level when the flooding occurred.

There was an emergency chamber at Level 580, Canada's The Globe & Mail reported. It is unclear if the workers were able to access the chamber.

"We are working in solidarity with all levels of government and as fast as we possibly can using all available resources in the country, as well as importing additional machinery and equipment to assist with locating our missing colleagues," Trevali chief executive Ricus Grimbeek said.

South Africa has also sent pumps and is flying them to the mine, while Ghana contributed high-capacity pumping equipment to the rescue effort, The Globe & Mail reported.

The Burkina Faso government has decided to move the crisis management committee nearer to the mine site to allow mine workers' families to be included, Grimbeek said.

Trevali is working to rebuild road on more than 5,000 metres of an underground decline ramp to help search efforts. It is also installing and operating pumping infrastructure to remove floodwater.

The company has used approximately 25,000 tonnes of waste rock to rehabilitate the mine access ramp, has installed 5,000 metres of new poly pipe, and installed more than 24 electric and diesel pumps.

Burkina Faso authorities will conduct an investigation into the incident, and mine managers must remain in the country during these investigations, The Globe & Mail reported.