Reverse Circulation 5" DTH hammer and bits RC543 Reverse
Circulation (RC) drilling is used to collect mineral and rock
samples quickly and efficiently using a large rotary drill and air
compressor. Reverse Circulation (or RC) drilling is one of the most
frequently used methods of drilling used across the world as it is
more cost effective and efficient then other methods of drilling.
When compared to RAB (Rotary Air Blast) and diamond drilling, RC
drilling seems to be somewhere in the middle when it comes to cost,
time, quality of samples, technique and depth. Applications:RC
drilling is a technique used in the majority of stages of mine
development.As it is cheaper than diamond core drilling, it is
often used in first stage exploration mining to delineate a
potentially extractable ore body. It is also preferable to RAB or
air-core drilling when trying to reach great depths, but RC
drilling is slower and more expensive than either of these two
methods.RC drilling is also consistently used during in-pit grade
control and the development stage of an ore body. Basics of
Reverse Circulation Drilling:(1) RC drilling uses rods with
inner and outer tubes, the drill cuttings are returned to surface
inside the rods. The drilling mechanism is a pneumatic
reciprocating piston known as a hammer driving a tungsten-steel
drill bit.(2) RC drilling utilizes much larger rigs and
machinery and depths of up to 500 meters are routinely achieved. RC
drilling ideally produces dry rock chips, as large air compressors
dry the rock out ahead of the advancing drill bit.(3) RC
drilling is slower and costlier but achieves better penetration
than RAB or air core drilling; it is cheaper than diamond coring
and is thus preferred for most mineral exploration
work.(4) Reverse circulation is achieved by blowing air down
the annulus of the rod, the differential pressure creating air lift
of the water and cuttings up the inner tube which is inside each
rod. It reaches the deflector box at the top of the drill string
then moves through a sample hose which is attached to the top of
the cyclone.The drill cuttings travel around the inside of the
cyclone until they fall through an opening at the bottom and are
collected in a sample bag. For any drill hole there will be a large
number of sample bags, each one marked to record the location and
drilling depth that the sample was obtained.The collected series of
sample bag cuttings are later taken for analysis to determine the
mineral composition of the drill hole. The analysis results of each
individual bag represents the mineral composition at a particular
sample point in the drill hole. Geologists can then survey the
drilled ground analysis and make decisions about the value of the
overall mineral deposit.Advantages of Reverse Circulation
DrillingCompared to core drilling, RC drilling with inherently
faster penetration rates provides several benefits:Direct drilling
cost reductions in the range of 25% to 40%.Faster completion of
drill programs with quicker delivery of results.Reduced man-hours
at the drill with decreased exposure to potential accidents.Reduced
contractor activity in the mine reduces mine support
burden.Indirect cost reductions gained from a simplified sampling
process.Requires less water than diamond drilling.RC samples are
collected at the drill and sent directly to the assay lab. Unlike
diamond drill core, which is generally logged, photographed, split
for sample, assayed and warehoused, RC sampling requires much less
handling resulting in faster assay turnaround with accompanying
cost reductions. Larger volume RC samples often give more
representative gold samples than split half core
samples. HammerModelHole Range(mm)External
Diameter(mm)Length (without bit)mmConnection ThreadWorking
PressureRE53184-1008110693"
Remet1.0-3.0MpaRE004111-12710712523.5-4" Remet 4"
Metzke1.0-3.0MpaRE542113-130109.511913.5-4" Remet 4"
Metzke1.0-3.0MpaRE543120-13511611913.5-4 Remet 4"
Metzke1.0-3.0MpaRE545122-135117.512614-4.5" Remet 4-4.5"
Metzke1.5-3.5MpaRE547130-146124.512704.5" Remet 4.5"
Metzke1.5-3.5MpaPR40124-142120.513623.5-4.5" Remet 3.5-4.5"
Metzke1.5-3.5MpaPR52126-14212112274-4.5" Remet 4-4.5"
Metzke1.5-3.5MpaPR52R130-14612412254-4.5" Remet 4-4.5"
Metzke1.5-3.5MpaPR54135-15013012944.5" Remet 4.5"
Metzke1.5-3.5MpaMX5456136-15013213624.5" Remet 4.5"
Metzke1.5-3.5MpaRC62/RC62R152-1901461320As
Request1.5-3.5MpaRC82/RC82R190-2501801395As
Request1.5-3.5MpaRC100/RC100R250-3702401528As
Request1.5-3.5Mpa /* March 10, 2023 17:59:20
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