I just had a cast iron mantlepiece welded. Not an easy job at all, and risky.
I would see if you can pop rivet a metal bar across the two broken pieces. Alternatively, you could make a new hole for attaching it somewhere, and just araldite the smaller broken piece back on (but don't screw on the smaller piece).
Something oily and food-safe should be fine on the rusty bits.
I just had a cast iron mantlepiece welded. Not an easy job at all, and risky.
I would see if you can pop rivet a metal bar across the two broken pieces. Alternatively, you could make a new hole for attaching it somewhere, and just araldite the smaller broken piece back on (but don't screw on the smaller piece).
Something oily and food-safe should be fine on the rusty bits.