So the dust created as spectators tramp around in this project is a bit of a concern to me, but still... very cool! Full discussion and video at the linked site.
For you geo-types, does copper sulfate ever crystallize as a mineral in the weathering zone above copper sulfide deposits? I don't think I've ever seen it listed as a mineral, but I would think it might occasionally be left behind in arid environments, such as the southern Arizona copper belt. Also, the name I remember for such weathering zones is "gossan," but in googling that term, it apparently applies specifically to iron oxide/hydroxide weathering remnants. What term would you apply to weathered copper deposits containing the typical suite of malachite, azurite, chrysocolla and so on?
Followup: Bunch more pictures here
Followup Wed. 11/19: Here