I am leaning towards the 38 mm in diameter and the thickness of about 2.9 mm which I believe is the thickness of the 1 oz gold american eagle. The eagle is about 33 mm in diameter so our coins would end up just over 1 oz of gold. I'm sure once CI has calculated all the costs from start to finish, we will be able to come up with the appropriate limited mintage.
I guess for a 38-39mm coin we could do with 1.5 Oz, a Maple Leaf 2Oz is 42mm
Thing is, do you mind the coin reading 1.5 Troy Oz?
BTW, other metals different to gold/silver can not be minted with the current mint I am using.