Colin,
A grade of diatomite from Australia (see, for example
http://www.maidenwelldiatomiteaustralia.com/aboutUs.htm)
has been touted over the last few years as a wonder medium for orchids. Aussie Gold appears to be a medium which includes Australian diatomite, developed in the San Diego, Californis area:
http://www.aussie-gold.com/
A picture of the mix shown on that web site looks like it has at least a couple of other ingredients.
I have no idea if it's any good. I suspect that it is the latest in a series of snake oil type products designed to enrich feather merchants at the expense of gullible orchid growers. There really is no panacea which will replace good cultural practice (and a bit of hard work).
Martin
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