Hi can BB check and verify this please the bucket of candy for 125 pumpkins is a zone buff for smelters the only buff ingame that affects all smelters this year though according to the wiki (so cant verify it) it isnt affecting gold smelters when it should be ...it did last year according to the dev diary
This is from 2016
Name: Bucket of candy
Type: Zone-wide buff (production)
Cost: 125 pumpkins
Description: Zone Effect +100% output on Smelters (Bronze, Iron, Steel, Gold, Titanium, Platinum) for 24 hours