A core drill is a drill specifically designed to remove a cylinder of material, much like a hole saw. The material left inside the drill bit is referred to as the core. Core drills are used for many applications, either where the core needs to be preserved (the drilling apparatus used in obtaining a core sample is often referred to as a corer), or where drilling can be done more rapidly since much less material needs to be removed than with a standard bit.
This is the reason that diamond-tipped core drills are commonly used in construction to create holes for pipes, manholes, and other large-diameter penetrations in concrete or stone.
Core drills are used frequently in mineral exploration where the coring may be several hundred to several thousand feet in length. The core samples are recovered and examined by geologists for mineral percentages and stratigraphic contact points. This gives Mining House the information necessary to begin or abandon mining operations in a particular area.
Geologists may use exploration drilling to learn more about geologic strata, without the specific goal of exploiting mineral resources. Core samples can provide a great deal of information about a site’s geological composition and history. These samples can also be taken from deposits of mud to collect layers of deposited data which provides information about the climate; shifting pollen counts can indicate changing weather, for example, while rises in deposits of certain chemicals can sometimes be linked with geologic or human activity.