A classic movie to look for is "Search for the Mother Lode: The Last Great Treasure," in which Charleton Heston gets to play two brothers, one of which is a crazed and crazy gold prospector.
At first, the movie is above ground with great scenery from British Columbia - although I think they are supposed to be in Alaska, if I remember right. They talk of placer gold and placer claims, pronouncing it "play - sir" - maybe that's a Canadian pronunciation, but it’s one I’ve never heard in any gold fields! Later, the movie and action ends up underground, where every thing is dark and dangerous, and where Charleton Heston gets to pronounce the most famous lines of the movie in a rasping Irish accent, “Mr. Dupree.... Stay the hell out of me mine, laddie.”
The movie seemed hilarious when watched with a semi-drunken bunch of thermally altered exploration geologists, partly because the geology or words just didn’t seem quite right. I haven’t watched this movie since about 1982, which is the year it was released, and wouldn't mind seeing it again. Unfortunately, the movie is only available on VHS, though I've heard reports that you can buy a Swedish DVD version. If you buy a new VHS version, it's considered a collector's item, and the price is from $45 to $150 plus. The movie has developed what seems to be a kind of cult following, although it was panned by critics (and geologists!) when it first came out.