You can remove the Ore spawns under GarrysMod\garrysmod\data\zrms\MAPNAME_OreSpawns.txt
You can remove the MetalBuyer NPCs under GarrysMod\garrysmod\data\zrms\MAPNAME_BuyerNPCs.txt
You can remove the Public Entites like the MineEntrance under GarrysMod\garrysmod\data\zrms\MAPNAME_PublicEnts.txt
