Find article reviews from International mining magazines and customers comments concerning their Devico experience.
I would like to say thank you again for your support for the Hayakawa project.
Our driller is still working, but, it will complete at the end of this month.
I think our clients are satisfied with your directional drilling.
I would just like to congratulate all participants (devico and drillcon) for your work. This hole showed the difference between complete failure or complete success. As everybody probably knows we missed the ore horizon due to hat the structural geology was’nt behaving as expected. At that point he hole was basically doomed.
Then, by doing devidrilling we got ourselves back in the game. Devico forced it down in inclination, through the ore horizon (which was the best hit so far) and the hole switched from failure to success. I think it’s just fantastic having the ability to do this. From the beginning people were talking about production gain and cost gain with devico but this aspect of being able to chase the ore horizon when the geology decides to disobey, gives me as a geologist a much easier job and better health.
Since the hit was much further away than planned we can count that as an extra hole and we now do a second try on the first target, so it has been a win-win situation for everybody.
Of course, drillcon must not be forgotten. It’s much hard work pulling the drill rods up and down and always have to adjust to new circumstances.
So, thanks everybody for a JOB WELL DONE.
About the Devico directional core drilling system
I was discussing with some colleagues that we may have set a record in the mining industry. We were able to discovery and delineate a mineral deposit with only three drill collar set-ups. The secret was the 43 directional holes started between 400-550 metres below the surface. I have expressed the cost advantages of directional drilling at many different venues and one can do their own math but very simply the avoidance of 400 to 550 metres for 43 diamond drill holes at today’s meterage costs is a significant savings. The bonus now is that the permitting agencies for exploration have visited our operations and seen the minimal impact we have on the environment and congratulated us!
We have surpassed 1 200 metres of actual Devico directional drilling since the change in directional drilling equipment in 2005. The change occurred after completing almost 3 000 metres of experience and proven mud motor operations. We will not return to the mud motor operations because of the numerous technological advances of the Devico system.
There can be a sense of hesitancy to try new technology and embrace research and development in the diamond drilling industry. But, with the increasing cost of core meterage that coincides with escalating exploration budgets now is the time to allocate funds to new methods and technology to maximize budgets for the future.
About the DeviDrill
Drilling 3 meter (10 feet) with a motor in this formation takes the whole shift, while Devidrill makes it in 45 minutes. It’s much quicker, gives better kick it gives core and there is no waste of water other than the normal amount used for core drilling.
About the Devico directional core drilling system DEviDrill:
MWRA concluded that ” Directional drilling proved to be a valuable tool in exploring in an area of complex geological conditions. A better representation of the rock at the tunnel elevation has been obtained, offering designers and contractors a better chance of estimating the true cost of the tunnel.”
John Kaplin at MWR reports after the incomming bids :
«We took bids on the tunnel segment where we did the Devico core.The three bids were very tight – $57 to $58 million, or only 2.5% spread among the bidders. this is very unusual for a tunnel contract and may be attributed to having done the horizontal core – in other words bidders felt more sure about the cost of tunneling in the bad ground and reduced the risk factor. We have seen bid spreads more typcially 20 to 40% on our other tunnels, so this is one positive aspect.»
About the Devico directional core drilling system, DeviDrill:
We have been using Major drilling of Canada for more than the past year on Devico drilling. The Devico we are using in Venezuela has proven to be a great piece of technology.
About the DeviFlex non-magnetic survey tool.:
The Devi Flex is working very well and it is very user friendly, certainly impressed.
Well it’s been an interesting 2 1/2 years to say the least. Many challenges which for the most part turned out to be successes. As a directional group we have benefited greatly from the opportunity to work for a client who was willing to work as a team and put their trust in us to do our best. This trust enabled us to develop and improve on new ideas that we now use every day. A good example was the idea of “cutting out of a directional cut”. When we first started this at Rambler 2 years ago “many” people felt it had very little chance of working on a consistent basis. Well it did work 95% of the time and probably led to 40 or more new branch holes over the past two years. This is only one example of the many advantages that can be realized when a good working relationship and understanding is established as was the case at the Rambler Project.
I’m sure I speak for Devico Norway when I say thanks for the opportunity to be a part of your project and we hope you share our feelings of a job well done!
Wishing your mining venture continued success!!
All the Best!
About the DeviFlex non magnetic survey tool
The Deviflex is simple and quite easy to use. Comparing to its competitors Deviflex is faster to build, measure and unpack. Speed produces money…In addition to this it is really reliable. Accuracy is also same kind of like competitors.
Devisoft has developed all the time and its operational reliability is now good! Its clarity makes the software easy to use and that way it is easy for new clients to start using DeviSoft
About the Devico directional core drilling system
In Jundee I had a major advantage in that the machine we were using allowed for complete control on all the dynamics required to run the Devico tool.
This along with some extremely experienced and receptive drillers we were able to control all aspects of drilling with the tool. We drilled around 100m with the tool and the results were extremely encouraging.
I am asked by allot of people about the Devico tool and there is allot of interest in it where ever I go and I can now confidently spread the word of its great performance.
I will not go into detail about the software although when this side of things is sorted out I feel you will really have something to take on the drilling world.
There are a few issues that could be addressed with lengths, compression strengths of springs and the poor quality of tube wrenches supplied with the tool, but over all I now have more confidence in the tool and intend to help spread the positive word about the tool.
About the Devico directional core drilling system
The Devico directional core barrel was used for 2 shifts on the 15th and 16th of February 2001. Unfortunately this was all the time left, as the Devico operators had other engagements to keep. Although time was short, it was enough to test the tool, and compare it with the NAVI Tool currently used at Jundee.
To date there are not many negatives for the Devico system. Outside of general time wasting due to all personnel being new to the system, and the breaking of a small o-ring, the testing of the tool was very positive, and certainly would, at this point in time, appear to save considerable amounts of time and money for future directional programs at Jundee. Outlined below are the advantages I see from utilising this system, and some ‘best guess’ comparisons with the NAVI Tool. There is no doubt that if this system was to come to site is would be in the ‘testing’ phase, but I believe it is in our best interests to do this to properly assess the tool.
The most obvious advantage of the Devico System over the NAVI Tool is the fact that we get continuous core through the directional portion of the hole. A number of lithological units were logged over the 20m that the Devico System drilled. It commenced in Dacite, then into Basalt and narrow Sediment was also observed. Previous directional runs on this hole did not pick up any of these units, as the NAVI Tool grinds its way through the rock, destroying all the lithological information.
This is where we can really save time and money. The Devico System operates similar to the standard core drilling technique, and the penetration rates were also similar during the test work. During the test work the Devico System was drilling a 3m run in under 40 minutes, quite comparable to the penetration rates of standard N-size core rates. If we assume that the time to retrieve the core and take a single shot survey at the end of each 3m run is about one hour, then this would equate to up to 36m in a shift. That is three times the average of the NAVI Tool.
As the Devico System is the same size as the standard N-size core barrel, no reaming of the directional work is required. The short (1.5m) barrel work will still be required, but time savings of 1-2 shifts can be expected due to the fact that no reaming is required.
Jan Rømo senior surveyor said that there was no difference in measurement made with the Devico PeeWee multishot and the theodolite used at the breakthrough point at 370m.
Jan Rømo have been in the surveying business for many years and have used a variety of survey tools, but never seen anything as accurate as the Devico PeeWee. He said: “It was absolute BANG ON, no difference between the data given from the theodolite and the data from the PeeWee multishot, unbelievable”