Wulfenite, a lead molybdate, is not that common in Australia with the main localities being Whim Creek, Western Australia, and the Avondale Mine, South Australia. Pretty well all other localities are just minor occurrences.
Winklers Mine is on Tikalina Station, Olary Province, in South Australia. It is not even listed in Mindat.
This is a specimen of wulfenite from Winklers Mine, and the photo is 5mm across.
I’ll look at doing an Australian wulfenite locality article for the Monthly Mineral Chronicles at some point in the future.