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Unidentified photographer
A Large-Scale California Mining Operation
n.d.
Ambrotype, 1/2 plate
Cowan's Auctions, Inc
American History: Premier Auction, 26 June 2018, Lot: 433
LL/83473
Taken from a hillside or top of a structure giving a bird's-eye-view of a very long and wide sluice run through a dry riverbed. A photograph held at the Oviatt Library at CSU-Northridge shows what appears to be the exact same operation from a different angle, identifying it as "Mining the Bed of the American River, about 1859," which lines up perfectly with the use of ambrotype photography.
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LuminousLint 
@LuminousLint