• Free Consultation
Article
  1. Home
  2. Placed Coal Mining Alaska

Placed Coal Mining Alaska

Pillars refer to the pillars of coal that are left in place to help support the ceiling. Using this method of mining may reduce the coal extraction ratio up to 60%. In Alaska underground mining was the primary form of coal mining used until about the late 1930’s – early 1940’s ( I was unable to find an exact date.)

Send Email:[email protected]

Online Comment Chat Online

Article Details

Random Article

Pay attention to the world's mining situation and focus on industry hotspots.