Is that additional 500 gold or just 500 gold....nevermind - you have to have full dwarven

I normally in Explore mode with my regular team get 480-ish or more Gold (with my multipliers and such)

I have a dwarven team (Lady Ironbeard kicks butt) this week and thought I would be getting 1000ish

Nevermind I found the bug in my team - I have to replace my Khaz team mate for a dwarf.

i assume its +500 gold at the end - after calculating all multipliers

Event Bonus events (so Bonus Gold, Bonus Souls, etc.) are added after all calculating multipliers. This means it’s always a flat amount and they are unaffected by multipliers.