Exploration diamond drilling
Exploration diamond drilling is used in the mining industry to
probe the contents of known ore deposits and potential sites. By
withdrawing a small diameter core of rock from the orebody,
geologists can analyse the core by chemical assay and conduct
petrologic, structural and mineralogical studies of the rock.
Diamond core drill bits
Rodolphe Leschot is often cited as being the inventor of the first
core bit. Early diamond drilling opened up many new areas for
mineral mining, and was related to a boom in mineral exploration in
remote locations. Before the invention of the portable diamond
drill, most mineral prospecting was limited to finding outcrops at
the surface and hand digging. In the late 1970s, General Electric
pioneered the technology of polycrystalline diamond compacts (PDCs)
as a replacement for natural diamonds in drill bits.
Drilling rig capable of both diamond and reverse circulation
Exploration diamond drilling differs from other geological drilling
in that a solid core is extracted from depth, for examination on
the surface. The key technology of the diamond drill is the actual
diamond bit itself. It is composed of industrial diamonds set into
a soft metallic matrix. As shown in the figure, the diamonds are
scattered throughout the matrix, and the action relies on the
matrix to slowly wear during the drilling, so as to expose more
diamonds. The bit is mounted onto a drill stem, which is connected
to a rotary drill. Water is injected into the drill pipe, so as to
wash out the rock cuttings produced by the bit and also to reduce
the heat produced due to friction which causes less wear and tear
of the bits. An actual diamond bit is a complex affair, usually
designed for a specific rock type, with many channels for washing.
The drill uses a diamond encrusted drill bit (pictured on the
right) to drill through the rock. The drill produces a "core" which
is photographed and split longitudinally. Half of the split core is
assayed while the other half is permanently stored for future use
and re-assaying if necessary. Although a larger diameter core is
the most preferred it is the most expensive. The most common
diameter sizes of core are NQ and CHD 76.
Early exploration companies tended to choose drilling contractors
who typically charge per meter rates and/or day rate depending on
difficulty of project. For example, Energold Drilling would provide
diamond drilling services for projects with limited infrastructure
and focus on portability, whereas larger drilling groups such as
Boart Longyear tended to work on established producing mine sites.
Extraction of core using triple-tube
Merely advancing the drill by rotary action (and washing) causes a
core to be extracted inside the barrel as shown. However, at a
depth of perhaps 300 m, there must be a way to retrieve the core
and take it to the surface. Constantly withdrawing the entire heavy
drill pipe is impractical, so methods were developed to pull up the
core inside the barrel. If the rock would always be solid granite,
and the core would always break at the drill bit, then it would be
a simple matter to stop the drilling, and lower a simple grabbing
device by a wire and pull up the core.
Unfortunately, many applications require an undisturbed core in
fractured rock, which calls for elaborate wire-line devices.
The photo shows the extraction of a core, using a triple-tube
wire-line system, capable of extracting core under the worst
This is very important when exploring fault zones such as the San
|Size||Hole (outside)||Core (inside)|
|diameter, mm||diameter, mm|
There are five major "wire line" tube sizes typically used. Larger
tubes produced larger diameter rock cores and require more drill
power to drive them. The choice of tube size is a trade-off between
the rock core diameter desired and the depth that can be drilled
with a particular drilling rig motor.
Q: Are you a manufacturer or trading company?
A: We are a specialized manufacturer.
Q: What are your main products, and used for?
A: Our products include core bit, PDC bit, reaming shell, core
barrel, casing, drill rod, SPT equipment, Shelby sampler, drill rig
and other drilling parts.
They are used for mineral exploration, geological drilling,
geotechnical engineering and soil sampling.
Q: How about the delivery terms?
1. Payment: T/T, L/C, Western Union, Paypal, 30% deposit in advance
and rest before delivery.
2. Min. order quantity: 1 piece.
3. Transportation: By DHL/TNT/Fedex express, air, sea, train.
Q: How about discount?
A: Price is based on products and order quantity.
Q: Do you accept sample order?
A: Yes sure, please contact us for details.
Q: How about your after-sales service?
A: As a manufacturer, we offer promt technology support for all
problems and questions. Besides, we accept goods return or replace
for quality problem.
Q: How does your company control the quality?
A: Quality first. In order to guarantee high quality for our
products, Roschen always makes a serious inspection for all
products and raw materials in strict procedure. We have obtained
certificate of ISO9001:2000 in 2004.
For more information please contact:
ROSCHEN GROUP LIMITED
ROSCHEN HOLDINGS LIMITED
Skype: ROSCHEN.TOOL , ROSCHEN_GROUP
WeChat: +86-137 6419 5009 ; +86-135 8585 5390
WhatsApp: +86-137 6419 5009 ; +86-135 8585 5390
Email: firstname.lastname@example.org ; email@example.com
Website: http://www.roschen.net ; http://www.roschen.cn
http://www.roschen.com ; http://www.roschengroup.com