MINING EXPLORATION
Much depends on the type of data required, the instrumentation that can be installed in the bottom-hole- assembly of the drill-string, and cross-interference that may occur between system and other drilling equipment. Scientific Drilling of the US and worldwide offers MWD services based on the use of mud pulse, electromagnetic and gyro devices. Te company emphasises reliability with its TUF (Tool Utilization Factor) system to accumulate data on tool wear based on temperature and vibration levels (directionally logged) down the hole. Te customer should then be able to achieve longer drill components life.
Directional drilling
Core drilling by Inyati Drilling & Mining Group in South Africa
be accurate to 88 degrees. It is waterproof and shock-tolerant and is easily maintained. Te drive for rapid data collection to
save time and avoid drilling errors can be aided by Measurement While Drilling procedures, also sometimes known as Logging While Drilling (LWD).
12 INTERNATIONAL MINING ENGINEER
Devico of Norway offers a range of borehole logging and instrumentation systems with the emphasis on coring by directional drilling and multi- shot instruments. Te use of accurate
directional drilling from
a single rig set-up can greatly save of exploration time and produce related data across variable-shape orebodies and other deposits from fewer locations. Te Devico DeviShot multi-shot
borehole survey instrument can record inclination, azimuth, too-face position, gravity vector, magnetic field vector and
A portable multi-probe borehole logger developed by the India Department of Science and Technology
magnetic dip as well as the temperature and battery status. It comes with its own flexible DeviSoft . Renishaw of the UK produces a number of borehole logging tools including the Boretrack. It is also marketing the C-ALS, which is a laser scanner deployable from a borehole to check on the presence and size of concealed voids to cut out the guesswork when one is encountered by drilling. It is claimed to be the only such borehole deployable device on the market and is more accurate than alternatives such as ground-penetrating radar.
Data processing
Te processing of data collected, whatever its accuracy, can be a time-
consuming and therefore expensive task. EpiLog from K&A Epimetron is an exploratory works management service that allows the user to enter, process and monitor many works in real time via the Internet.
Te main advantages of this procedure
are immediate recording and management of drilling data, monitoring of works progress anywhere at any time, automated and immediate computation of quantitative data and a great reduction in the time required to produce reports and other documents. Results include valuable additions to exploratory data, better structural safety for mine workers and more accurate estimation of remedial measure requirements.
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