Yes. Ore belts. Ice belts. And moon ore belts (in 0.5 sec space only); which will be new to you.
That sounds like an opportunity. For you.
They could exist untouched for a number of reasons. If these belts were too close to a particular hub such as Jita or Hek (say 4 jumps away) they might be attracting too many gankers.?
Or, if they are too far from those same hubs, and/or there are no player-owned structures in-system where you can compress the ore, they might be difficult places to haul from? And player-owned Upwell structures such as athanors - refineries - where you can both compress and reprocess ore (for better yield) may also be new to you?
Or, if they are in an icebelt system, then post the recent wardec changes, Russian or German gangs may have splashed all other player-owned structures (other than their own); which discourages mining.
Or, if they are in 0.5 systems, then the ore you can get from the moon belts is always better, (does not matter what flavor of ore you are chasing) so why would you mine regular ore belts?
Another change is that the Agency will now tell you every system that has ore anomalies. It does not tell you what those anomalies are, but it means you can now take your miner on tour with a high(er) chance of getting an anom, and one with better ore than in your static belts.
And there are likely many other reasons. Point is, unless you are looking for friends, just go ahead and mine those belts. If that is something you want to do/ you can make isk from. And if no-one cares, put up your own structure eventually, and start reprocessing. Otherwise, go to an icebelt or 0.5 system and I guarantee you will find hisec miners.