Nov 26 (Reuters) - Four employees of Canada's Barrick

Gold ( GOLD ) have been detained in Mali, a top African gold

producer, amid increasing attempts by the military-led

government to impose additional taxes on mining firms, according

to two sources on Tuesday.

Mali is one of Africa's top gold producers and the detention

of foreign officials is becoming part of a pattern as the

government seeks to extract more income from the sector.

A spokesperson for Barrick did not immediately respond to a

request for comment.

(Reporting by David Lewis and Giulia Paravicini; Additional

reporting by Felix Njini; Editing by Anait Miridzhanian)