If you recruit gold you are trying to raise money. In other words, you're fundraising.

募金 originally just referred to the act of collecting donations for a cause, such as disaster relief, charity, or nonprofit activities. But nowadays, it can also mean the act of donating money for such a cause.

This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.