I'm a chemist. Harvesting and mixing various materials I find is most of what I do. Though honestly, harvesting the materials I want to work with tends to take up far more time and effort than I'd like. Since most "civilized" people don't want to deal with a parasite like me and won't sell me goods, I have to get my supplies myself the old fashioned way: Going on-site and harvesting the stuff myself. You wouldn't believe how annoying it is to collect -any- significant amount of an element like uranium. And don't get me started on copper, all I can generally get are copper salts, which I have to process internally to get the copper I want out the stuff...
But no matter how annoying it can get, it's always a joy to finally reap the rewards of my effort in seeking out what I want!