A prize of gold is so old fashioned. We use cash now, which is why this word means cash prize.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
Did you know that the prize money is actually on Koichi's head?
I heard that Viet won a one-hundred-million yen cash prize from a horse race during his Japan trip this time.
When do we get our prize money from the funny face competition?