In 1883, Mr J Runnalls employed seventy people at the Penlee quarries and stone-mills. The stone was wholly used for road-making and was claimed to be one of the most durable available. On one square inch of stone, it took a pressure of 29.011 lbs to crush the stone and on one square foot, it took 1365 tons. Stone was exported to Welsh ports instead of ballast and to Bristol, Ipswich, London and Lowestoft for roads. Stone to London was taken weekly by steamer from Penzance and by sailing vessels from Mousehole.[2]