Nice. Very fun. I like when there's a special project a player is avid about. Mine is lighting up the oceans with lampposts so I never pass by an iron deposit. Not nearly as gigantic or ongoing of a project as yours though. Enjoy your gold pyramid.
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Currently, it's big enough that if I stand so that the bottom of the screen is just off the ground, the entire screen, with the exception of the top corners, is completely covered in gold bars.
I've been collecting gold almost as long as I've been playing Terraria. Not sure why, I just really like the stuff.