Yes, unfortunately there were a lot of filmmakers in SA during the 60's and later who took advantage of the natural beauty and the varied locations, not forgetting the fact that SA crews and actors are hard workers but notoriously low paid ones. That unfortunate state of affairs continues to this day.
The NFVSA (National Film Archives) has all the films you mentioned and yes, Untamed
with the lovely Susan Hayward was made here in its' entirety.
:hatred:I really don't know why they blocked me from the IMDB as I get a lot of enquiries from there re SA films and I try to help people on their message boards there. They let me go to places like www.nakedandninety.com
but the IMDB: No, there be prawnographee!