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You add recipe as a separate mod element now. Once you make your ore, just add a new recipe mod element and select your ore as smelting recipe input and your ingot item as output.
Based on this question, you might want to take a look at our tutorials collection: https://www.youtube.com/playlist?list=PLAeL-oIFIEngE6jRgFYeFMfuj8WQsO3Ei