New York mill., Gilpin COUNTY COLORADO Number of stamps used, 1863. HALL HISTORY v.3 p.420 Stamps; ore crushed. R. M. News. Nov. 13, 1869. p.l c.2 Stamps run by water. Dy.Cent.City Reg.May 9, 1871. p.l c.2 Operating; stamps. R. M. News. Oct. 12, 1882. p.7 c.3 Stamps; activities, 1879. R. M. News. Jan. 1, 1880. p.21 c.2