Silt Collection

Purton Hulks, near Sharpness, Gloucestershire
The remains of one of the Purton Hulks. The old boats were deliberately sunk in 1950s to protect the banks of the Sharpness and Gloucester Canal at Purton, near Sharpness Docks

Diamond in pebble
A solitary diamond in conglomerate, from Golconda, India

Calidris himantopus, stilt-sandpiper
Plate 344 from John James Audubons Birds of America, original double elephant folio (1835-38), hand-coloured aquatint. Engraved, printed and coloured by R. Havell (& Son), London

Diamond Hunting / Borneo
Natives hunting for diamonds in a river, Borneo. They sieve through the silt in the hope that they will find diamonds. Date: 1883

America, San Francisco. Gold-Washing at the Diggings
Engraving of two men engaged in digging for gold and sifting the ore in a cradle, washing the silt away from the crystals of gold in the river

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