Go to here.
Aeronautical Information Package (AIP) | Airservices
Click "I agree" then choose "AIP Book", then "Enroute" then go to page ENR 1.5-34 then look under 6. Alternate Weather Minima.
It seems that the Alternate Minima figure on the chart doubles as both the minima at which an alternate is required and also the wx requirements for that airport to be able to to be used as an alternate. Very Australian.