I've been meaning to check if this possible glitch was still around. And Viorica just recently got done smelting several massive mounds of copper ore (most likely the leavings of a mysterious copper miner who was on autopilot for a long, long time). I guess I wasn't paying attention.
Smelting still annoys me with its disparity with leather boiling, too. With leather boiling, you dump a ton of cured leather patches and a ton of wax into the cauldron, and the engine makes a separate check to convert each leather patch to boiled leather. But with smelting, the engine makes one check for the entire smelter load, whether it's one hunk of ore or a hundred. So you can lose dozens of ores on one bad roll of the dice, rather than lose a number of ores which is more or less proportionate to your level of skill (a la leather boiling), a disparity which in turn encourages people to go through the vexing process of loading and smelting one lump of ore at a time, just to get a fair chance at seeing a decent return for lugging hundreds of pounds of ore from the seams to the smelter. Is this working as intended, or could smelting stand some fine-tuning with separated and individual ore-to-ingot checks?