If I was applying for a freelance job about writing about gems and geology for example, I would explain that I have over 40 years of professional experience as a practicing mainly field geologist with 19 years of it in a large producing open pit copper/molybdenum/gold/silver operation. I would stress that with so much field experience I am able to visualize many mining/geological situations and I am both very practical and very theoretical. Also, I would say that I have just written a book about the history of mining and geology so have considerable valuable writing experience plus doing some geological reports on the internet. Also, since I understand that such work could require talking to people in other countries and since Latin America has some valuable gems like emeralds, and since I learned Spanish while travelling in Latin America, I will be able to do phone research for such mineral occurrences.