| After-sales Service: | Yes |
|---|---|
| Warranty: | Yes |
| Quality: | Best |
| Hole Range: | 121-146mm |
| Thread: | 3.5′′ Remet / 4′′&4.5′′ Remet / Metzke |
| Shank: | Src545 |
| Samples: |
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| Customization: |
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Audited Supplier SOLLROC Reverse Circulation drilling (RC) ,from size 3'' to 5.5'', is a technique of drilling that uses dual wall drill rods that consist of an outer drill rod with an inner tube. By using compressed air to extract rock fragments sample,the samples travel through rods to a sample splitter at surface, avoiding all contact between the samples and the borehole wall that allows samples to be retrieved with minimal contamination,which is mainly used in deep hole exploration and mining grade control.
RC drilling uses a drill bit that features round, protruding tungsten-carbide buttons, to cut through hard rock and earth. The drill rods themselves are hollow and feature an inner tube with an outer barrel (similar to air core drilling).
A pneumatic reciprocating piston (also known as a downhole hammer) delivers rapid impacts to the drill stem, transferring this energy through the drill bit. This extra concussive force hammers the bit into the rock, pulverising it, while a rotational device ensures that the drill bit hits new sections of rock with each impact.
Inside the drill bit, a dual-walled drill pipe is used to achieve circulation, with compressed air getting injected between the tubes to flush the cuttings from the hole and up through the inner tube. The cuttings travel back up the tube to the surface, into a cyclone, where they go over a splitter that delivers the samples into a sample bag.
The exploration team then collects the samples, align them to the hole depth, and layout for their client to log. From here the sample is transported to their lab for assay.
| Length(Without bit) | Weight(Without bit) | External diameter | Bit Shank | Hole range | |||
| 1235mm | 63kg | 117.5mm | SRC545 | 121-146mm | |||
| Connection thread | Working Pressure | Impact rate at 2.4Mpa | Recommended rotation speed | ||||
| 3.5'' Remet / 4''&4.5'' Remet / Metzke |
1.5-3.5Mpa | 35HZ | 25-40rpm | ||||
1.RC drilling is a technique used in the majority of stages of mine development.
2.RC drilling is commonly employed in open-cut mines and used for pit grade control and in delivering useful insight for mine planning and blasting. It has an optimal depth of between 300-500 metres.
3.RC grade control is extremely effective in defining boundaries between ore bodies and waste rock
4.RC drilling is ideal for exploration, as it delivers contaminant-free samples, which are collected at the drill itself and can be sent immediately for assessment. It also reduces handling time, which in turn can serve to reduce overall program costs.
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