Came back after a few months of not playing Factorio, and half of my early-game furnaces had stopped working. Turns out Angel has made it impossible to smelt basic ores in his recent updates. NOT COOL!

This patch re-enables the smelting of iron & copper ores, also optionally - Bob's tin & lead if you have Bob's Metals, Chemicals and Intermediates. It will also add back Kovarex Enrichment Process if you hated that Angel hid it.