Although the strike and dip of planar features such as bedding, foliation, faults and veins is not known, the angle of these features with respect to the axis of the drill core axis is noted, because it still provides valuable information about the geometry of the features. Mineral testing may also be done, including testing for fluorescence scheelite , testing for effervescence with dilute HCl carbonate alteration , or mineral staining feldspars or carbonates.
Often the core will be photographed as well. Voids and fracture zones cause poor recovery. The drill logs used to construct drill sections cross sections showing the drill holes which illustrate the subsurface geometry of the ore body.
The current trend is to create drill logs in digital or spreadsheet format, which facilitates the construction of drill sections by computer. Core splitting is done using a rock saw or an impact core splitter. There is always the problem of obtaining a representative split of the core. Great care must be taken to avoid this problem. Sometimes the entire core is analyzed to avoid this problem, but usually only if logging is extremely thorough.
RVC Drilling RVC drilling is fundamentally different from diamond core drilling, both in terms of equipment and sampling. One major difference is that RVC drilling creates small rock chips instead of solid core. Other major differences are in the rate of penetration and cost per foot. RVC drilling is much faster than diamond core drilling, and also much less expensive.
RVC drilling requires much larger equipment, including a high capacity air compressor. The compressor forces air down the outer space of a double wall pipe Figure 16 - 2.
The air circulates back up through the inner pipe carrying the rock chips, which are recovered at the surface. The chips are collected continuously as the drill advances into the ground. Each pipe is extremely heavy and requires the use of a winch to lift and position over the drill hole. Figure 16 - 2. RVC drill bits are also completely different from diamond drill bits.
This type of bit works well in dry drilling conditions ie, above the water table and in rock formations which are dense and hard. Below the water table, the water in the formation actually cushions the bit, making it much less effective at shattering the rock. Tricone bits are slower drilling in hard formations, but are very effective in soft formations and in wet drilling conditions.
Samples of drill cuttings are usually collected over five foot intervals. In dry drilling conditions above the water table , a dry splitter is used also know as a Jones splitter Figure 16 - 3. With diamond drills, you can create holes to any depth. Choosing diamond core drilling over other traditional drilling options bring you a plethora of benefits.
Diamond drills help you cut through concrete or any other building material in more accurate and effective way. And thus there is no risk of damage involved in the operation. Another great advantage is they are compact and lightweight, which makes them a suitable choice for any concrete drilling project where space is primary concern.
If concrete drilling needs to be performed at workspaces such as hospitals and retail stores where noise-free operation is a primary requirement, diamond drilling makes the best choice. Overall, it is safe to say that diamond core drilling cause minimal disruption possible at the workspace. When you hire experienced and certified diamond core drilling specialists, they can create precise holes or openings of any size and shape in the most efficient and safest manner.
Want to know more about the benefits and applications of diamond drilling? Get in touch with us today! Diamond drilling is a core drilling technique used by professional contractors for creating precisely measured holes using rotary drills with diamond bits.
Diamonds are the hardest natural materials and diamond drilling techniques are designed to use their rigorousness to pierce through concrete, metal, asphalt and other materials that are difficult to cut through otherwise.
Diamond drilling is used to create accurate and precise openings in rigid structures. It is used at construction sites and in renovation or partial demolition projects. Diamond drilling is a type of core drilling and consists of a motorised power source with a diamond drill bit attached. Boasting a status as the hardest naturally occurring material in existence, diamond can cut openings in a range of materials, such as concrete, metal and glass.
And unlike other types of steel drilling, which tend to be percussive, the non-percussive nature of diamond drilling gives it a great ability to be precise, which is a sought-after quality for many projects. Diamond drilling can be used for many situations, and especially when precise holes are required.
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