archaeology vs mineshaft

archaeology

noun
  • the actual excavation, examination, analysis and interpretation. 

  • the actual remains together with their location in the stratigraphy. 

  • the academic subject; in the USA: one of the four sub-disciplines of anthropology. 

  • The study of the past by excavation and analysis of its material remains 

mineshaft

noun
  • A vertical hole through the strata to reach the mineral which is being mined. 

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