An inspection of the Ordnance Map (1 in.) shows this clearly. It is the road called (near Andover) the Port Way.
See p. 46.
The water supply of Silchester seems to have been wholly derived from these wells, which are from 25 to 30 feet in depth, and were usually lined with wood. In one of them there were found (in 1900) stones of various fruit trees (cherry, plum, etc.), the introduction of which into Britain has long been attributed to the Romans, (See Earle, 'English Plant Names.') But this find is not beyond suspicion of being merely a mouse's hoard of recent date.
Roman refineries for extracting silver existed in the lead-mining districts both of the Mendips and of Derbyshire, which were worked continuously throughout the occupation. But the Silchester plant was adapted for dealing with far more refractory ores; for what purpose we cannot tell.