[PAR35]

Here’s another clue:

500 x 432 feet would give you your 216,000 footprint (other number would also work.) If x*y=216,000 square feet,
x*y / (60*60*60) = z, with z being a constant.

[painter]

I saw a show sometime back that said that all the gold mined up to this point is history would be the size of the Washington Monument.