Hollins Mine, Rosedale Chimney Bank, Rosedale, Ryedale, North Yorkshire, 1967. A view looking down towards a car parked beside spoil heaps at Hollins Ironstone Mine. In 1853 magnetite ore, a high grade iron ore, was discovered just north east of Hollins Farm, Rosedale. Hollins was the first of a number of mines to be established around Rosedale and was worked intensively from 1859 by the Rosedale Mining Company. The mine is now a Scheduled Monument.