Like what you see? Ask us for a full-length preview and pricing options for our entire course catalog
Request full preview
At surface mines, highwalls are unexcavated faces of exposed overburden, which can range in height from 20 feet to more than 100 feet, depending upon the geological characteristics of the area and the material being mined. The slope and condition of the face of the highwall may also vary significantly, depending upon the nature of the stone or sediment. For example, highwalls of consolidated stone may be vertical or nearly vertical, while those of unconsolidated material and sediments may retain the slope at which the material naturally comes to rest.