Rivers and Creeks

[kiwifred]

Don't know what this is, just up from blown over hut.

 

[Mackka]

Stamper floor?

 

[Lost Adams]

I've seen pictures of these before. The caption said they were washing floors, dirt and rock was brought in wagons and dumped on the deck. Water was let in to make a slurry and horses were driven over the conglomerate to break it up. Then the larger rock was scraped out with sluice rakes and the water run out with the pay-dirt through a sluice box.
Just my best guess!