digging vs quarrying

digging

noun
  • A place where ore is dug, especially certain localities in California, Australia, etc. where gold is obtained. 

  • The action performed by a person or thing that digs. 

quarrying

noun
  • The extraction of material from a quarry. 

  • A small piece of stone chipped off any stone found in a quarry. 

How often have the words digging and quarrying occurred in a corpus of books? (source: Google Ngram Viewer )