AbstractThe remnants of former tin‐streaming channels on the North Teign River, Dartmoor have been investigated using techniques adopted from palaeohydrology, sedimentology, and environmental chemistry. the pattern of multiple streaming channels in the lower reaches, and a single channel in the upper reaches coincides with a reduction of potential stream power from 250 Wm−2at a drainage area of 8.7 km2. the streaming sections were engineered to maximize the efficiency to separate cassiterite (SnO2) from its gravel matrix, and the palaeohydraulic properties of channels suggests that sorting was most efficient for the sand and fine gravel size ranges. This was confirmed when the residual tin content of streaming‐sediments was assessed. Residual levels of tin were found only in the silt fraction (<6
展开▼
