Quarrying expanded rapidly in the first half of the 19th century. Significant quarries opened at Llechwedd, Maenofferen and Votty & Bowydd, while Turner and Casson's Diphwys Casson flourished. Further afield, Cwmorthin and Wrysgan quarries were established to the south of the town, while at the head of Cwm Penmachno to the north-east, a series of quarries started at Rhiwbach, Cwt y Bugail and Blaen y Cwm. To the south-east another cluster of quarries worked the slopes of Manod Mawr.