I added a few ore veins in my mod and they worked fine but only one time. Once used the first time, they never respawn. I've read a few places about glitches but I have only had problems with the ones I created.

Any ideas?

Check to make sure that the cell the ore is being added to doesn't have an Encounter Zone with the "Never Resets" flag toggled on. This will prevent the script attached to the ore veins from ever processing the OnReset() event that restores their original state.

If the Cell's Encounter Zone can't be changed for any reason, objects can be given independent Encounter Zones at the top of their Reference window. The vanilla Encounter Zone "NoZoneZone" is a default zone without the "Never Resets" flag on.

Thanks for your reply. The cell is set to No Reset which certainly explains exactly what you are saying. I reset it to None after looking up a couple of vanilla mine zones that were also set to none.