MND VS VIT

[Purplenv]

VIT provides accuracy and consistancy with the swing bar. Your target location for the mini-game will be more predictable. For things like gold ore, this is critical.
MND increases yield, but since many mining items are hard capped at one, and all items are capped at 3 for main hand, the effect is minimized, compared to botany, or off hand harvesting.

[Civilrant]

VIT provides accuracy and consistancy with the swing bar. Your target location for the mini-game will be more predictable. For things like gold ore, this is critical.
MND increases yield, but since many mining items are hard capped at one, and all items are capped at 3 for main hand, the effect is minimized, compared to botany, or off hand harvesting.

In regards to VIT that is how i always thought of it. But after hitting 50 and ranking up a conj i don't put points into either VIT or MND now. I haven't noticed any difference in HQ, sweet spot, or yield. Sadly I am afraid its going to turn out like all the other stats... meaning yes it has an impact but, its so minor you will never notice.
I hit 50 months ago (1st on Rab^^) and still mine to fund my BSM GSM and my pockets and i still haven't had any noticeable differences in varying my stats. I currently keep my stats set for my Conj during NM hunts. with is 184 INT 120 PIE. I don't bother putting any points into VIT or MND anymore, since it doesn't seem to matter. But I encourage everyone to do their own tests.