Physical description
Three page handwritten Mine Manager's Reports from the Hercules and Energetic Mines, transcribed by Albert Richardson. 1898 report from F. Youlden; 1909 report from J. Roberts.
Extract from Youlden report 18.6.1898: 'Consumption of firewood for the month since making the alterations to feed pipes has beewn 258 tons. Am now trying some coal to see if expense can be further reduced'