In mining, we need to excavate rock to get down to the target ore. But to get there holes are in the earth passing through different types of rocks. Each rock type having different properties such as strength, elasticity and how the rock dips or is layered. These factors along with hole angles and depths influence the drill and blast process and overall mining process.
When drilling into rock that is transitional (soft to hard, or hard to soft) or interbedded (multiple hard and soft thin layers of rock) the effects are multiple with reduced productivity and increased tooling cost. How the bit reacts to the variation in formations greatly influences how quick the hole is drilled and the quality of the hole as well; while there can also be increased instances of bit stalling, plugged bits and broken cutting teeth or bearing failures when the formation variation is not anticipated well.
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