Currently I don't have an ore golem. I've had one in the past and it is not listed under my Manor tab.  When I try to use a new scheme, it says I can't.

I know I've made multiples off of one scheme in the past. Has something changed?  I get the 'you can use more than one of this item' error.

Golems are different from other schemes in that you can only learn each type of golem once. 

 Did you by chance create the golem? Check under Inventory > Golems. If it's listed there, you're going to reap the golem rewards and when it expires the recipe will show up again in your library to craft again.