http://www.edrdg.org/wiki/index.php/Editorial_policy#References
G n-grams:
ゴールドディギング  No matches

"gold digging", not "gold digger" but I can't find any evidence this is actually used. Nothing relevant in the web results.
From the editorial policy: "Please note that a Japanese Wikipedia article by itself is not necessarily a good source for a dictionary entry. Some articles are simply translations from an English page and not evidence that a term is in use in Japanese. Sometimes an article only covers one aspect of a term's usage, and there are other senses which need to be covered. It is best to check the term in other sources and state that in the References section."

https://ja.wikipedia.org/wiki/ゴールドディギング