The gold, oil and cocoa producing country saw consumer inflation rise to an 18-year record of almost 24% in April.

Ubank was created more than four decades ago to serve as a savings fund for mine workers.

The United States, the world's largest market for natural diamonds, imposed sanctions on Russia's state-controlled Alrosa in April.

The US is not opposed to China investing in Africa if the investments are centred on upholding human rights, democracy and jobs.

There has been no communication with the miners since they were trapped more than 1,640 ft below ground during a flood at Trevali's Perkoa zinc mine on April 16. 

Forex support by the Bank of Sierra Leone for petroleum product imports was estimated at $24 million in the first quarter of this year.