What is a salad plate with gold gilding worth today?

Answer 1

The same as a salad plate without gold. The amount of gold in the decoration is so small it has no value to scrap gold buyers.

That plate might have value to a china replacement service or to a china collector though. They might be interested in buying it to sell to someone who collects that pattern or to add to their own collection. A service like Replacements.com would be able to quote you a price, and also check ebay, Etsy and Ruby Lane, websites where collectors often look for pieces they need.