Mining (from Pennsylvania) -- Britannica Student Encyclopedia - The Diigo Meta page

• 01 May 06
  

  Maggie Tsai

  nn penn

  • Pennsylvania has valuable deposits of petroleum. The first commercial oil well in the United States was drilled at Titusville by Edwin L. Drake in 1859. Today the richest oilfields are in McKean, Warren, Venango, Elk, and Forest counties. This northwestern corner of the state also yields natural gas. Sand and gravel are found in many parts of the state.
  • Cement is the second most valuable mineral. Most of it comes from Northampton and Lehigh counties. The Keystone State ranks after Texas and California in cement production. Third in value is stone. Limestone is quarried primarily in southeastern Pennsylvania.
  • This soft coal is used largely by mills and factories and electric-power plants.
  • Coal is by far the most valuable mineral in the state.
  • Mining

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