When I saw this mini-map for the firs time, I thought "again ive pressed some bloody nasty key" and started mashing my keyboard without any luck. The reason of apperance is an achievement, which is "rewarded" with Magic Compass(actually, it is this very mini-map). Alas, it seems there will be no updates for this game, so I can offer a little "hack" to do this.
Remember, this is a "hack", it will mess with your achievements and maybe something else, if you do something wrong your game may end being broken, use at your own risk!
1)Type in your search window "%APPDATA%\..\LocalLow\AMG\SexyMysticSurvivors"
2)Locate and open for edit file "SaveGameMain.es3"
3)find lines
"conditionName" : "COND_FindersKeepers_3",
"progress" : 50,
"progressInt" : some number here,
"unlocked" : true
4)change last two lines to
"progressInt" : -999999999,
"unlocked" : false
5)Save, launch the game and BINGO! However, both your finders keepers achivement and Magic Compass will be locked(disabled).