CNB Summary and Why Its So Undervalued, page-2399

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Fatclay

55 Posts.

21/11/20

20:03

Post #: 49042623
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Originally posted by mustpow: ↑

reverse circulation RC drilling uses a percussion hammer (driven by air compressors) to bore into the ground. The air is also used to pressurise the hole and the broken rock from the face of the percussion hammer returns to the surface via steel inner tubes inside the drilling rods (all driven by air pressure).

the sampling interval or resolution of RC drilling is one metre. The drillers collect the sample in green plastic bags from an air cyclone separator, or sometimes in buckets that are tipped into individual piles on the ground. As the sample is being collected it is common for a sub-sample to be “split” from the main sample using a riffle or cone splitter. The splits, weighing 2-3kg are collected in calico bags and sent to the lab. The bulk of the sample remains in the green plastic bags or in piles on the ground. The plastic bags from each metre of drilling can weigh in excess of 40kg in fresh rock.

aircore is a smaller scale RC drilling method. Instead of using a percussion hammer, a cutting bit is used to cut and smash its way through the ground. It is typically used as a reconnaissance method where the ground is soft or weathered enough to allow it and is considerably cheaper than full sized RC drilling. Aircore rigs can also use percussion hammers if the ground is harder, functioning just like a “real” RC rig but with much smaller sample size and limits to the depth of drilling.

A full sized RC rig will be powered by the rig engine, the rig compressor and a support truck with auxiliary and booster compressors. It is not unusual for the bigger RC rigs to consume around 2000L of diesel per shift. The air capacity of such rigs is 2200cfm/1100psi. They are loud and dusty.

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Thanks @mustpow for the detailed explanation

CNB Price at posting: 42.0¢ Sentiment: Hold Disclosure: Held
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CNB Summary and Why Its So Undervalued, page-2399

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CNB Summary and Why Its So Undervalued, page-2399

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