A delver was someone who dug things up. In Yorkshire, most often it refers to someone who worked in a stone quarry. The term is applied to both someone who weilds a shovel and someone who owns a quarry so we have to look closely to see what social 'strata' an individual comes from.
James Clegg is our most prominent delver but there are several in our tree.
Locally around the Calder Valley the word Delph - an old English word for a quarry - occurs in several place names. The extended family of James Clegg's second wife, Elizabeth Spencer, lived at Delph Hill near King Cross, Halifax and were stone merchants (delvers).