South Africa has silver mines so had a strong incentive to keep silver in the coinage for longer than elsewhere.
ZAR coins (1892-1897): sterling (.925 fine)
1898-1922: no coins issued
1922-1950: .800 fine
1950-1964: .500 fine
1 rand coin 1965-1976: .800 fine
You should find the
CurrencyDebasement website useful for determining silver content of the more commonly encountered world silver coins.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis