Spending committed by mining and energy companies to start or expand projects fell 14.6% to US$212bn at the end of April from $248bn a year earlier. That is a $36 billion drop.
Angry rioters attacked the nickel facility, which has been closed since early May after an estimated 100,000 litres of acid-tainted effluent polluted a nearby creek.
Susan Shabangu, highly criticized for her handling of a strike in the platinum sector, was booted out from a cabinet that now includes South Africa's first black minister and a first openly gay official.