scrub that, i see your from aussie. which means your looking at stuff on the net.
there is a lot of stuff about varroa and a lot of stuff thats way out of date.
mineral oil mixes where a thing about 10-15 years ago that never really worked.
there is better methods, see the oxalic acid and also randy olivers thymol vapor blocks (which looks promising).
as far as treating varroa in aussie goes, i highly recommend you use synthetics to get you through the first few seasons. the reinvasion of varroa is really bad. some beeks here where treating all year round until all the feral bees died out and the reinvasion stopped.
i highly doubt that any organic treatment is going to work well in that situation.