Use DoodadObject.phaseId property and LINQ
//Vein phaseId.
public uint IronVeinId = 3054;//Iron Vein
public uint[] FortunaVeinIds = { 3056, 17071, 17118, 17119, 17120, 17121, 17122, 17123, 17124, 17125, 17126, 22367 }; //fortuna vein
public uint RemnantVeinId = 17070;//Remnant Vein...