Bell Hollow sits under an escarpment full of seams. Take a pick down a claim, work the rock, haul it back up and have it assayed. Sell for florins to keep the lamp lit, or bank it as silver.
One hill, everybody on it. Work a seam out and the next miner finds it worked out. The rock grows back in its own time. The silver does not: there is a fixed amount of it and the assay office counts it down.