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ISO Diamond Core Drilling Bits for Geological Exploration Core Drilling

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ISO Diamond Core Drilling Bits for Geological Exploration Core Drilling

Country/Region china
City & Province shanghai shanghai
Categories Gaskets

Product Details

diamond core drilling bits for geological exploration Core Drilling

Diamond Core Drilling Bits for Geological Exploration Core 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 drilling
 

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.

 


Specifications: 

 

 

STANDARD SET DIMENSIONS FOR DIAMOND CORE BITS AND REAMING SHELLS
Core Barrel DesignationCore BitCore BitReaming Shell
Outside Set DiameterInside Set DiameterSet Diameter
MaximumMinimumMaximumMinimumMaximumMinimum
InchesmmInchesmmInchesmmInchesmmInchesmmInchesmm
EWT(EXT)1.47537.461.46537.210.9123.110.922.861.4937.851.4837.59
IEWS1.47537.461.46537.21125.40.9925.151.4937.851.4837.59
EWG1.47537.461.46537.210.8521.590.8421.341.4937.851.4837.592
AQ1.8847.751.8747.51.06727.11.05726.851.89548.131.88547.88
AQIK1.8847.751.8747.51.20630.631.19630.381.89548.131.88547.88
ATW(ADB-GM)1.8847.751.8747.51.19830.431.18830.181.89548.131.88547.88
AWT(AXT)1.8847.751.8747.51.28632.661.27632.411.89548.131.88547.88
ATK34(AW34)1.8847.751.8747.51.32533.661.31533.41.89548.131.88547.88
AXC(AWC3)1.89548.131.85547.881.06727.11.05726.851.89548.131.88547.88
JTK48/LTK481.8847.751.8747.51.39435.411.38435.151.89548.131.88547.88
BQ2.3559.692.3459.441.43836.531.42836.272.36560.072.35559.82
BQ32.3559.692.3459.441.32533.651.31533.42.36560.072.35559.82
BQTK2.3559.692.3459.441.60640.791.59640.542.36560.072.35559.82
BXB(BWC3)2.36560.072.35559.821.43836.531.42836.272.36560.072.35559.82
BWG(BX)2.3559.692.3459.441.65942.141.64941.882.36560.072.35559.82
NQ2.9775,442.9675.181.8847.751.8747.52.98575.822.97575.57
NQ22.9775.442.9675.18250.81.9950.652.98575.822.97575.57
NQ3/NQTT2.9775.442.9675.181.7845.211.7744.962.98575.822.97575.57
NWG(NX)2.9775.442.9675.182.1654.862.1554.612.98575.822.97575.57
NMLC2.9775.442.9675.182.05252.122.04251.872.98575.822.97575.57
HQ3.7795.763.75595.382.50563.632.49563.383.7996.273.77595.89
HQ3/HQTT3.7795.763.75595.382.41161.242.40160.993.7996.273.77595.89
PQ4.815122.34.795121.83.3585.093.3484.844.835

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