Former Barrick CEO Mark Bristow. A power struggle and strategic disagreements with the company's chairman John Thornton led to Mr. Bristow's ouster, sources say.

Years of friction between Barrick Mining Corp. ABX-T chairman John Thornton and Mark Bristow, the company’s former chief executive, preceded the ouster of Mr. Bristow last week, multiple sources told The Globe and Mail.

Toronto-based Barrick on Sept. 29 said that Mr. Bristow had left the company , but it did not provide a reason.

Mr. Bristow had led Barrick since January, 2019, and was handpicked by Mr. Thornton after Barrick acquired Randgold Resources Ltd., the Africa-focused mining company founded and run by Mr. Bristow for more than two decades.

While Mr. Bristow and Mr. Thornton got on well in the early years of worki

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