[steve-b]

Current reserves, at current depletion rates, will be gone in about 60 years.

Current reserves of anything are generally a few decades away from depletion, for the simple reason that if the known supply will last a generation, there's no incentive to undertake a search for more. If the known supply gets a bit tight, the price goes up, and the searches start.

[Cobra Scott]

My bad, See explanation above.