Science Struck
Science Struck: Difference Between Surface and Underground Mining
Explains what surface and subsurface mining are, which ores are suited to each, their main differences, the types of mining within each category, and the advantages and disadvantages of surface and underground mining.
CK-12 Foundation
Ck 12: Earth Science: Finding and Mining Ores
[Free Registration/Login may be required to access all resource tools.] Identifies some of the valuable minerals and metals, and how they are located, mined, and refined.