this is a pic of my "mining operation" on a large gravel bar in NorCal - I tried to process 80-100 buckets of screened gravel thru a sluice every day. I knew from sampling that I could get 3 dwts a day of mainly flood gold. That's about 5 grams or 100 plus dollars. I managed to process about 10% of the bar before moving up to dredging equip. The flood/fine gold is still there as far as I know. If 500/wk works out to 25,000/yr - you've got what you need - except the all-day trips to town for supplies, camp chores, and hiking up, then down 1,000 foot canyon trails every week - mining ain't easy !!