I've been mining in HIP 93377 since it was anarchy. Now it's a federation system with pristine metal rich/metallic/ice/rocky rings and planets all to choose from. High Tech Refinery system, and one jump from Jonai which is another High Tech system. The pristine metallic ring is only 14ls from the main large station iirc. There is 1 station, and 2 outposts here that always offer lots of mining missions, any many other types as well. The minor factions tend to be at war here as well, so if mining gets boring there's always a high/low/haz RES, and high/low combat zones to choose from as well. You can buy everything you need here or in Jonai the neighboring system.
I usually play late at night and I am always down for a chill mining wing or some sort. Feel free to add Microdia Kinslayer to your friends and send me a message to burn some rocks together!