sentences:  The Udston Colliery, owned by the Udston Coal Company, was situated at the top of Hillhouse, Hamilton behind where Townhill Road now runs.Opened in 1875, it was a small pit employing approximately 200 men and boys working in three coal seams at depths of up to underground.The workings of the colliery extended for and were bordered on three sides by the Blantyre, Earnock, and Greenfield Collieries.