Titan ore (equivalent to krypton gold) is the most expensive, cobalt blue ore (equivalent to magic iron) is the second, and Sagan (equivalent to refined gold) is the cheapest. Because Sagan's output is so large, I am too lazy to mine in many cases.

The price (Loughtumo Valley) is about 1 Titan =6 cobalt blue = 10 Sagan =6G.