I smelted a pile of approximately 40,000 dull MINI iron ore (mini iron ore is the half a ingot ore pile so 2 = 1 ingot) and it yielded 15,000 dull ingots. It should have yielded 20,000. I then tested this by smelting a pile of EXACTLY 30,500 MINI shadow ore ingots. It yielded 15,000 shadow iron ingots. It should have yielded 15,250 ingots. I then tested this again by smelting a pile of 7,501 LARGE Piles of iron ore (large piles should yield 2 ingots per 1 pile). When I smelted that it gave me 15,002 iron ingots. Clearly there is some bug with mini ore piles and smelting. It cost be APPROXIMATELY 5,000 colored ingots.