hello mrmineshaft68, when a prison resets, this means that, yes, you will lose your plot and, yes, you will lose your mining rank. basically almost everything gets reset/brought back to 0. the things that do not reset are things like cosmetics, like pocketpals or particle effects, donator ranks, perks, keys(exception of event keys if you did not open any/had any) hoope this helped and answered your question. have a great day!
As stated above but there is more to this well also they had new stuff like things the community has suggested for the server to add. Everything puposaurus said was correct and yes you will lose everything in game exept for ranks etc.