Mount Isa has 90m spacing and has VOR, NDB, DGA and RNAV approaches. The 90m spacing is mentioned specifically in ERSA for MA.
Without looking at the AIP for a reference, in addition to what was quoted from the CASA MOS, it mentions a couple of runways that whilst they are "Instrument Runways" they are also classified as country airports and only have 90m spacing. Broome is another from memory (I stand to be corrected on that)
Edit: I guess MA and Broome fall into one of the categories Gav just mentioned.