South Africa’s cabinet said on Thursday it has approved for publication a review of revisions to its charter for the mining sector, a process that was supposed to have been done months ago raising concerns about policy uncertainty in the industry.

“Mineral Resources Minister Mosebenzi Zwane will provide a briefing once the charter has been gazetted,” the cabinet said in a statement, without providing further details such as when it will be published.

According to Bloomberg, Zwane “has proposed raising the mandatory black ownership of mining assets to 30 percent from 26 percent, drawing opposition from some ruling-party officials who fear it will deter investment, two people familiar with the situation said”.

(Reporting by Nqobile Dludla; Writing by Ed Stoddard; Editing by James Macharia)