One gram of gold is worth about US$40 right now, and a "fair" placer site will yield that in about 6 hours of work. That is enough to live on if one does not pay rent, nor buy much gasoline, nor pay for medical care, nor car insurance, nor electricity. It will pay for a mill site fee and perhaps work clothes as they wear out.
Seems like a bloody hell of a poor life. Not even Walmart employees are paid as poorly, and a bloody hell of a lot of them need welfare to meet basic needs.
Another problem is income tax. If the sale of gold exceeds US$600 (if I recall correctly), one must +report that income. If one is running one's own gold-recovery business, one must pay the business tax: about US$800 a year (which goes chiefly to Social Security).
Living off one's mineral claims can be done, but it's a sucky life.