Huang Chung
19-07-2011, 08:18 PM
Was going through the Drill Torque prospectus, and came across this description of the various types of drilling/rigs.
May be useful to some.
Technology Description
Auger Drilling
This type of drilling uses solid or hollow augers to
take soil samples from relatively shallow depths.
It is only suitable in soft earth. This type of drilling
is usually the first pass evaluation of prospective
ground. The auger rig is usually mounted on a
light 4WD vehicle which can access ground
without requiring prepared roads. The auger is
drilled down until hard rock or resistance is met
which may occur at surface level to a depth of
20 plus metres. Auger drilling is also used for
geotechnical soil sample evaluations.
Rotary Air Blast (RAB) Drilling
This drilling method is usually used as the
first stage in greenfield exploration. RAB uses
compressed air to bring the sample to the surface
between the drill rods and the drill hole. This
method of drilling can produce a large number of
samples as it is a first pass sampling technique.
Rotary Mud Drilling
This method involves pumping pressurised water
with drilling fluids to the face of the drill bit. The
sample is returned to the surface on the outside
of the drill rods.
This type of drilling is often used in sandy ground
where the holes will not stay open.
Technology Description
Reverse Circulation (RC) Drilling
This is an elegant method of obtaining an
uncontaminated sample by using compressed air
blown through the drill rods, returning the sample
through a tube inside the drill rod.
RC drilling uses an air driven hammer that breaks
the rock into a chip or powdered sample. The
air brings the sample to the surface where it
is inspected and bagged by a geologist. This
method of drilling is used in hard rock mineral
exploration.
Diamond Drilling
This method of drilling uses drill bits that are
impregnated with diamonds to cut a solid core
of rock. This then provides a sample that can be
analysed for mineral content and also shows the
structure of the mineralisation.
Diamond drilling is usually performed after a RAB
/ Aircore or RC program has given an indication
of mineralisation. Diamond Drilling is usually
conducted as a 24 hour operation with a crew for
both day and night shifts.
Often a client will require a RC hole to be drilled
to a depth where mineralisation commences with
a diamond “tail” drilled in the same hole.
http://www.drilltorque.com.au/
Disc....I'm subscribing for shares.
May be useful to some.
Technology Description
Auger Drilling
This type of drilling uses solid or hollow augers to
take soil samples from relatively shallow depths.
It is only suitable in soft earth. This type of drilling
is usually the first pass evaluation of prospective
ground. The auger rig is usually mounted on a
light 4WD vehicle which can access ground
without requiring prepared roads. The auger is
drilled down until hard rock or resistance is met
which may occur at surface level to a depth of
20 plus metres. Auger drilling is also used for
geotechnical soil sample evaluations.
Rotary Air Blast (RAB) Drilling
This drilling method is usually used as the
first stage in greenfield exploration. RAB uses
compressed air to bring the sample to the surface
between the drill rods and the drill hole. This
method of drilling can produce a large number of
samples as it is a first pass sampling technique.
Rotary Mud Drilling
This method involves pumping pressurised water
with drilling fluids to the face of the drill bit. The
sample is returned to the surface on the outside
of the drill rods.
This type of drilling is often used in sandy ground
where the holes will not stay open.
Technology Description
Reverse Circulation (RC) Drilling
This is an elegant method of obtaining an
uncontaminated sample by using compressed air
blown through the drill rods, returning the sample
through a tube inside the drill rod.
RC drilling uses an air driven hammer that breaks
the rock into a chip or powdered sample. The
air brings the sample to the surface where it
is inspected and bagged by a geologist. This
method of drilling is used in hard rock mineral
exploration.
Diamond Drilling
This method of drilling uses drill bits that are
impregnated with diamonds to cut a solid core
of rock. This then provides a sample that can be
analysed for mineral content and also shows the
structure of the mineralisation.
Diamond drilling is usually performed after a RAB
/ Aircore or RC program has given an indication
of mineralisation. Diamond Drilling is usually
conducted as a 24 hour operation with a crew for
both day and night shifts.
Often a client will require a RC hole to be drilled
to a depth where mineralisation commences with
a diamond “tail” drilled in the same hole.
http://www.drilltorque.com.au/
Disc....I'm subscribing for shares.