In-Mine Degasification: Target’s surface and underground directional drilling technologies can
successfully degasify (remove the methane) coalbeds that are or will be mined. This degasification
greatly improves the safety during mining, reduces production delays due to methane and water, and
reduces costly ventilation requirements. Degasification also reduces the release of the
particularly onerous greenhouse gas- methane- into the atmosphere. Depending on the reservoir
properties of the coalbed, the methane can be captured, sold and utilized on site.
Old Works Verification: Directionally drilled surface-initiated or underground boreholes of known
location and trajectory can verify the location, and/or non-presence, of abandoned mines and their
workings to permit safe mining by the active mine without the hazard of unexpected inundation of
water or gases from the abandoned mine.
Water Drainholes: Mines often encounter nearby abandoned mines that are in the same coalbed or
overlying or underlying coalbeds. Some of these mines have flooded since abandonment. Federal
regulations do not permit mining under perched water- such as a flooded mine and these must be
drained to permit mining. When not flooded, an underlying abandoned mine can function as an easy,
economical water disposal reservoir for an active mine. Target’s directional drilling capability
provides an economical and versatile means to place water drainage boreholes in advantageous
locations to transport and control water flow for in-seam situations or between overlying or
underlying abandoned mines. Many of these sites can be reached from outcrops. Others can be
accessed from underground. The links below are some of the in mine applications.
Coalbed Exploration: Directionally drilled, long horizontal boreholes drilled in advance of mining
can provide valuable information about the area to be mined along its length that cannot be
determined by the limited sampling area of vertical boreholes. This can include geological
information such as seam thickening or thinning, faults, local dips, etc… or other anomalies such
as burn areas, high water or gas content areas, etc… Controlled borehole deviations (“laterals” to
the sides or “sidetracks” up or down) can be drilled to further probe or define areas of interest
where more information is desired or critical. Where these boreholes are used for degasification,
the coalbed exploration information comes as a side benefit to the mine.
Wellhead Control: The drilling of long boreholes into the ground always carries the potential, or
goal, of encountering gas and/or water at high pressures. Therefore, maintaining absolute control
during and after drilling at the wellhead of the gas and or water pressures and flows is a
necessary requirement to eliminate this hazard. Target’s specially designed wellhead control system
has proven its unfailing ability to meet this safety need.