quarrying vs strip mine

quarrying

noun
  • The extraction of material from a quarry. 

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

strip mine

noun
  • A mine where the material above the ore is removed (stripped) to expose it for removal and use. 

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