3k per shovel - as many as you want... back of the napkin shows that each shovel produces 6k worth of ingots @25g per ingot..
6-7 swings on a shovel 25 average large ore per Regular Golem 30+ for the golem lord 2 ingots per ore = 310 x 20 per ingot = 6200g This assumes just one golem per swing. Sometimes you wiff, sometimes you get 2 per swing. Also assumes only 6 swings on a shovel. Some have 7. It also assumes 20g per ingot. 25g per sells almost instantly, especially on DC and Shadow, with 30 the top if you wait a bit. That's the bankable darn near guaranteed return... Next add in the lottery chance of a Plat @ 10k or a Statuette @ 100k. Not to mention the fun