I'm pretty sure there are several missing; but I managed to find eighteen receipts, for at least seventeen iron runs (one of the receipts was for a returned battery). Adding it all up it comes to 14,560 pounds of iron that we have removed from the property, about seven and a quarter tons, over a period of two and a half years. The earliest I found was dated March 14th '08. (And between March 14th and March 20th of that year we took seven loads of iron to the scrapyard.)
And like I said I think there are a few missing, so I'd guess it's really approaching ten tons. This is not counting cars, either.
Still, even if it's 'only' a little more than seven tons, that's a lot of iron. And there's still more!