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I haven’t seen any reliable sources say this yet.
An article from February 3 https://www.sabcnews.com/sabcnews/minerals/?hilite=minerals by the country’s public broadcaster, quotes the Minister of Minerals and Petroleum Resources, Gwede Mantashe, saying South Africa’s minerals should be withheld from US, but I’ve seen no reports that it actually will be.
I also couldn’t find anything at the government’s website https://www.gov.za/, nor via DDG at Reuters or AP.
Because they blocked you? Maybe they don’t want to see posts from people who don’t summarize the articles in the subject/title?
(The current subject is from the source, “Microsoft Follows Google on a Controversial Decision - gHacks Tech News”.)