Have also noticed this especially on northern half of the Aakas server, not as bad elsewhere. Did a run in the Aakas sever 2 nights ago that was ore only. I ran north from Scrap yard up to boundary of 8 coins with eMINE FS tier 0.5 and a level 5 amp (average depth 670), every single hit was lyst. Fascinated I then moved across to the east 30 paces and ran due south with an F-106 tier 9 fully depth enhanced and same amp (average depth 970). Again pure lyst. Thought it was just me. Worrying that it is not.
I don't mine allot but i sometimes have the same problem, yesterday i dropped allot of lyst too but also other stuff but my tt return was +40 so i can't complain there