A couple of notes

SALT is the story of award winning and internationally renowned photo-artist, Murray Fredericks on his annual solo pilgrimage to the heart of Lake Eyre in the remote north corner of South Australia. It is a piece on the personal journey of the artist, the creative process and the landscape itself.
http://shop.abc.net.au/browse/product.asp?productid=782744

I saw this on TV a few months ago - it is brilliant - maybe the artist could be interested in helping you with pictures (commercial work of course - he does it for a living)

There was also a documentary some years on Salt (the chemical, mining, uses in industry, food, etc) which was brilliant - but I don't seem to be able to find a useful link online - can't remember if it was a Radio only one - think it may have been on the ABC (Aust) Science (radio) show (there may have been a book), but there is a multitude of extra returns on the search topic.