DAVIDSON COUNTY - NC The Cid district is an area of about 125 square miles in southern Davidson County that extends from the Yadkin River on the southwest to about a mile beyond the village of Cid on the northeast. The earliest record of activity in this district is in 1832 at which time the Conrad Hill mine was already producing. The Silver Hill mine began operation a few years later. Other important mines in the district were the Cid and the Emmons. Except for the Civil War period when the mines were closed, most of the activity of the Cid district occurred before 1885. Ruth in NC