The above was just an idle cusiosity that came to me during the never ending harvesting of spell rares for all my alts.
I could have got mining to 623 using Pick of the Duke as Brell is my god, but didn't have the blessing with me and I couldn't be bothered heading into my home and back to my harvest spot, and I figured another 25 points wouldn't make a huge difference 
Does anybody have a good use for ethereal material... I have tons of the stuff.
And finally, one of these days I might actually get round to looking at all the harvest data I have from this xpac to see if the above data is consistant throughout.