The core recovered can be more than the drilled length(drill run): The extra core length recovered is from the previous drill run core loss; So during core recovery you should expect core loss or core gain.( Correction to point made at 5.52min of the video)
@Dale Sims, i was browsing thru a couple of sites when i run into your channel. I was in Australia back in the mid 90's up to 2000 doing coring work for both offshore and onshore for big oilfiled companies in' Australia. Watching and listening to your explanation some of them are not applicable in our recovery system and while coring in progress. I dont get to see the core in the oilfield recovery system while in the geothermal work i get to see the core recovered. I do coring in 2 5/8", 4" and 5 1/4" core sizes. Its nice to know the differences based on your explanation. Thanks.
I'm more of an above ground process plant design engineer, currently learning the exploration / drilling / jorc definition stage of process. Lots of useful info here. Thanks for posting.
BTW the core logging course is about to run again in Brisbane in July 2021; www.aig.org.au/events/core-skills-for-geoscientists-2021-introduction-to-core-logging-data-quality-and-interpretation-5-day-course/ cheers dale
Hi Dale, great video thanks so much, it really helped me to understand much better core logging process. Any chance you could make a video on RQF and RQD? Also, are you doing another course on Core Logging and Interpretation any time soon? I would be very interested in attending. Thanks!
So you have a C/G of .9 but when you measured it it was only .6.. Was there a loss in the previous rod? How did you do the mark up as it says it was 45.55 on the block? I'm currently a field technician and I'm really struggling on correcting my meter marking. I can't find a video on the complete mark up, what do you do if you 20 cm out but it says that there is no loss on the D or R
Hi AFC and thanks for question. It isn't a precise science so measurement errors tend to cancel out unless there is a major problem. So my advice is go with drillers blocks unless there is a major mixup. The 20cm you are out will be corrected down the hole. If it is is a major mixup and the drillers are still around ask them to sort it out - they keep runsheets as well for this purpose. You cant get cm accuracy on this and in reality the downhole xyz depths are not without error due to the processing methods applied to locate points downhole. BTW After i made this video SEG Discovery magazine had a great article on core measurement; Error-Proofing Diamond Drilling and Drill Core Measurements. pubs.geoscienceworld.org/segweb/segdiscovery/article-abstract/doi/10.5382/Geo-and-Mining-09/593042/Error-Proofing-Diamond-Drilling-and-Drill-Core?redirectedFrom=fulltext Its behind a paywall but if you are working with geos ask if any are a SEG member and they can loan it to you for a read. cheers dale
It is possible to recover more core than a drilled length in a core run. A section of core can be left down borehole and picked up on a subsequent core run, thus having greater recovery in the ext core run than the length of the core run. This can be indicated by an overdrive marking of the core with the overdrive section of core left down the hole being of slightly smaller diameter.
Hi Raphael - Not sure if you are asking about the empty boxes that the core is put into or the completed box filled with core. Or maybe these particular boxes of core? These boxes of core are in the core collection at my local university in Australia and I arranged access/permission to use them for this video. If you want to look at core then you could try your local university if they teach economic geology, your state geological survey who may have a core library where their or company drill core is stored or perhaps approach mining and/or exploration companies in your area who may have some non-secret core they can show you.. If you really are asking about empty boxes then field supply companys sell them (eg www.dynamicsgex.com.au/products/plastic-discoverer-series-2-core-trays-core-boxes) and then the drillers fill them up when drilling the holes! hope this helps - cheers dale
As a Beginner offsider in this regard, i will never trust driller or Geo in this operations of this job but i will say if you have done your job done right you have nothing to worry about . As a beguiner i was happy that my company defended my and my drillers actions on drilling . if anyone is off siding they may understand what im talking about but it is rough hard work similar to farm work but with some protections. underground Dimond drilling i can see been exposed as a bad situation . i called it quits after 4 weeks of a driller not willing to help lift 6 meter core all by myself which my guess is close to 70 kg if not more. On a BHP site when the linit you can lift is 20 lol ill be fine with 40 but when you got 50kg its rough on the body
Dale as a driller in seam, never drill 3m or waste a core and damage gear, 2.9 was my best core method and succesfull. it would have been nice to get congrats from geos on our recovery for you guys on that expected them for government approval as i don,t think you understand doing 1000m cores. cheers. Try doing one yourself champ..
thanks for your advice Daniel. Drilling 2.9m rather than 3.0m is fine of course if that gives better coal core recovery in your experience. I would expect that the core blocks you would write then would reflect that; "drilled 2.9 recovered 2.9" but a 3.0m drilling length (with 3m gear) does seem to be the industry standard. Sorry to hear your efforts haven't been appreciated either. My background is as a geo in metals rather than coal but i do have some exposure to the challenges of deep drilling supervising drilling programs up to 2.2km deep at Mt Isa in early 1990's. I understand you regarding the difficulty of doing it. I couldn't do it I am happy to admit!
thanks Chris - yes good point - if i omitted to say that or got it mixed up my apology - it was unscripted and the camera didnt pull me up on it. the alternative view is the core barrel stays still and the earth spins around it but thats only a matter of perspective... cheers dale
thanks for asking Javier. it is not uncommon for any box to have multiple blocks in it - if the tray (box) holds say 5m and the run size is 3m this will be very common! And if the driller has difficulty in penetrating the ground and so short core runs occur then there will be many blocks in a tray. It doesn't matter really. The measurements of distance drilled against core length recovered are made block to block and so checking of drilled length to recovered length can be made sequentially down the drillhole. The things to check are 1. that the trays are on the rack in the right order, 2. the trays are in the right orientation (reading the core downhole like the text on a page in a book - or lines on a website) and not the wrong way around as that can confuse you 3. the drillers have been careful in their work (sometimes i have seen the core blocks so disorganised that you have to ask the drillers to bring their documentation and come to sort out the issues - but rarely these days). Is this your question or have i missed the point somehow?
sorry Om - in what regard - the drilling rig used to drill the holes? the large core would probably have been drilled by a machine like a UDR650 or UDR1000 or similar. EG ddh1drilling.com.au/our-equipment/ the smaller core is from an UG rig like a LM60 or LM75/90 www.boartlongyear.com/product/lm75/ cheers dale
I am not sure there is much of a difference PH - they are both planar discontinuities in the rock mass across which there has been no movement although they may have fill of some type. They both need to be natural breaks - the issue in geotech logging is to ensure you exclude counting any breaks which are drilling induced. The move to AI-based geotech logging based on core images or scans has a problem with this. There is great info on geotech logging in the AusIMM's Monograph 30 - Guide to Good Practice in Resource and Reserve Estimation.
I am not a geologist--- I have come across many many Core in my life- core cutting and SG test and seen many Mishaps ---some are Positioned wrong way round
Hi Akash- its not really possible given the short exposure length across core. If you have a joint running down the core axis then you can get some idea of persistence but not spacing! One or the other! BTW - There is a great paper on geotech logging in core by Andre Van As 2014; Collection of Geotechnical Data from Drill core; AusIMM Monograph 30 Guide to Good Practice; . p109-120. There are a lot of good papers in that monograph - worth the cost. cheers dale www.ausimm.com/publications/monograph/monograph-30---mineral-resource-and-ore-reserve-estimation---the-ausimm-guide-to-good-practice/
@@akashchordiya2210 well its going to be an approximation! People do log persistence in core but the scale of observation is limited. So logging is a blend of art and science with guesswork thrown in! All data has limitations so core is no different so we need to understand the impact of those limitations. Sorry but it isn't a perfect world and our role as scientists is to be able to communicate the uncertainty we have in the analysis of our data to the people who consume our outputs. cheers dale
Наука
Thank you Dale - As an aspiring exploration geologist without core-logging experience, this is exactly what I need at this time.
The core recovered can be more than the drilled length(drill run): The extra core length recovered is from the previous drill run core loss; So during core recovery you should expect core loss or core gain.( Correction to point made at 5.52min of the video)
great thanks simon - good point.Drilling is an inexact science! A bit like geology!!
We consider the Drilling tube (3 m) as drilling run
Can I get job ,,am a underground driller from Tanzania
@Dale Sims, i was browsing thru a couple of sites when i run into your channel. I was in Australia back in the mid 90's up to 2000 doing coring work for both offshore and onshore for big oilfiled companies in' Australia. Watching and listening to your explanation some of them are not applicable in our recovery system and while coring in progress. I dont get to see the core in the oilfield recovery system while in the geothermal work i get to see the core recovered. I do coring in 2 5/8", 4" and 5 1/4" core sizes. Its nice to know the differences based on your explanation. Thanks.
Dear Sir; Thank you a lot for this precious video full of lessons.
I wish you a lot of success and health.
I'm more of an above ground process plant design engineer, currently learning the exploration / drilling / jorc definition stage of process. Lots of useful info here. Thanks for posting.
Very helpful, I wish you create more video like this about geology, thanks! 👍🏻
Hi Dale, thank you so much for sharing
Good lesson learnt thanks Brother Dale. I LIKE THIS COURSE SO MUCH. NEED TO LEARN MORE FROM YOUR VIDIO. THANKS
Thanks dale using this in the field!
thank you so much
.well explained
Great presentation thanks
Very good presentation, congratulations to you, Long distant greetings from Tucson, Arizona
thanks! some bloopers in there i need to fix but hey - one day!
Hi, Very good topic- thanks a lot from Iran. some good points for me.
Very helpful sir, thank you very much
I am a beginner in core logging. This video is an eye opener. Thanks
no problem - glad it was of some help - good luck with it!
how has it been?
Hello, can you please advice, is it necessary to use helmets during core logging?
Thank you for the introduction and explanation, Sir
thanks you for watching it! I hope it helps you!
Thanks Dale, informative vedio.
Pls can you advice place for core training?
BTW the core logging course is about to run again in Brisbane in July 2021;
www.aig.org.au/events/core-skills-for-geoscientists-2021-introduction-to-core-logging-data-quality-and-interpretation-5-day-course/
cheers dale
Yes, yes, yes!, It good you have a course so more people can learn and enjoy rocks my best wishes in your course.
Hi Dale, great video thanks so much, it really helped me to understand much better core logging process. Any chance you could make a video on RQF and RQD?
Also, are you doing another course on Core Logging and Interpretation any time soon? I would be very interested in attending.
Thanks!
👍🏻 best regards from Chile
thanks and good luck!
Dear sir, I am very thankful to you for this video. kindly share more knowledge with us about logging.
your welcome!
thank you
So you have a C/G of .9 but when you measured it it was only .6..
Was there a loss in the previous rod? How did you do the mark up as it says it was 45.55 on the block?
I'm currently a field technician and I'm really struggling on correcting my meter marking.
I can't find a video on the complete mark up, what do you do if you 20 cm out but it says that there is no loss on the D or R
Hi AFC and thanks for question. It isn't a precise science so measurement errors tend to cancel out unless there is a major problem. So my advice is go with drillers blocks unless there is a major mixup. The 20cm you are out will be corrected down the hole. If it is is a major mixup and the drillers are still around ask them to sort it out - they keep runsheets as well for this purpose. You cant get cm accuracy on this and in reality the downhole xyz depths are not without error due to the processing methods applied to locate points downhole.
BTW After i made this video SEG Discovery magazine had a great article on core measurement; Error-Proofing Diamond Drilling and Drill Core Measurements.
pubs.geoscienceworld.org/segweb/segdiscovery/article-abstract/doi/10.5382/Geo-and-Mining-09/593042/Error-Proofing-Diamond-Drilling-and-Drill-Core?redirectedFrom=fulltext
Its behind a paywall but if you are working with geos ask if any are a SEG member and they can loan it to you for a read. cheers dale
It is possible to recover more core than a drilled length in a core run. A section of core can be left down borehole and picked up on a subsequent core run, thus having greater recovery in the ext core run than the length of the core run. This can be indicated by an overdrive marking of the core with the overdrive section of core left down the hole being of slightly smaller diameter.
yes great point Richard!
Hello sir, thank you for the video. May i ask where do the core boxes come from? It's for a special project i have. Thanks in advance!
Hi Raphael - Not sure if you are asking about the empty boxes that the core is put into or the completed box filled with core. Or maybe these particular boxes of core? These boxes of core are in the core collection at my local university in Australia and I arranged access/permission to use them for this video. If you want to look at core then you could try your local university if they teach economic geology, your state geological survey who may have a core library where their or company drill core is stored or perhaps approach mining and/or exploration companies in your area who may have some non-secret core they can show you.. If you really are asking about empty boxes then field supply companys sell them (eg www.dynamicsgex.com.au/products/plastic-discoverer-series-2-core-trays-core-boxes) and then the drillers fill them up when drilling the holes! hope this helps - cheers dale
@@dalesims8686 thank you so much! Yes i was interested in those empty box, core trays. All the best
As a Beginner offsider in this regard, i will never trust driller or Geo in this operations of this job but i will say if you have done your job done right you have nothing to worry about . As a beguiner i was happy that my company defended my and my drillers actions on drilling . if anyone is off siding they may understand what im talking about but it is rough hard work similar to farm work but with some protections. underground Dimond drilling i can see been exposed as a bad situation .
i called it quits after 4 weeks of a driller not willing to help lift 6 meter core all by myself which my guess is close to 70 kg if not more. On a BHP site when the linit you can lift is 20 lol ill be fine with 40 but when you got 50kg its rough on the body
Saludos de bolivia
Dale as a driller in seam, never drill 3m or waste a core and damage gear, 2.9 was my best core method and succesfull. it would have been nice to get congrats from geos on our recovery for you guys on that expected them for government approval as i don,t think you understand doing 1000m cores. cheers. Try doing one yourself champ..
thanks for your advice Daniel. Drilling 2.9m rather than 3.0m is fine of course if that gives better coal core recovery in your experience. I would expect that the core blocks you would write then would reflect that; "drilled 2.9 recovered 2.9" but a 3.0m drilling length (with 3m gear) does seem to be the industry standard.
Sorry to hear your efforts haven't been appreciated either. My background is as a geo in metals rather than coal but i do have some exposure to the challenges of deep drilling supervising drilling programs up to 2.2km deep at Mt Isa in early 1990's. I understand you regarding the difficulty of doing it. I couldn't do it I am happy to admit!
Thanks
The tube stays stationary at the bottom of the hole inside the core barrel, with the core barrel spinning around it
thanks Chris - yes good point - if i omitted to say that or got it mixed up my apology - it was unscripted and the camera didnt pull me up on it. the alternative view is the core barrel stays still and the earth spins around it but thats only a matter of perspective... cheers dale
How to estimate inicial and final depth when we have two blocks in the same box?
thanks for asking Javier. it is not uncommon for any box to have multiple blocks in it - if the tray (box) holds say 5m and the run size is 3m this will be very common! And if the driller has difficulty in penetrating the ground and so short core runs occur then there will be many blocks in a tray. It doesn't matter really. The measurements of distance drilled against core length recovered are made block to block and so checking of drilled length to recovered length can be made sequentially down the drillhole. The things to check are 1. that the trays are on the rack in the right order, 2. the trays are in the right orientation (reading the core downhole like the text on a page in a book - or lines on a website) and not the wrong way around as that can confuse you 3. the drillers have been careful in their work (sometimes i have seen the core blocks so disorganised that you have to ask the drillers to bring their documentation and come to sort out the issues - but rarely these days). Is this your question or have i missed the point somehow?
Would this be Australia code?
21:08 he talks about core logging
Yes Ahmed - the course will run again in Brisbane Australia in July;
www.aig.org.au/events/core-skills-for-geoscientists-2022/
rgds
dale
Which portable Machine is used here?
sorry Om - in what regard - the drilling rig used to drill the holes? the large core would probably have been drilled by a machine like a UDR650 or UDR1000 or similar. EG ddh1drilling.com.au/our-equipment/ the smaller core is from an UG rig like a LM60 or LM75/90 www.boartlongyear.com/product/lm75/ cheers dale
My job 💪
lucky you!
How do you like it? What country are you in?
@@happytrails5342 me Tanzania 🇹🇿
How to find difference between joints and fracture in core logging
On field
I am not sure there is much of a difference PH - they are both planar discontinuities in the rock mass across which there has been no movement although they may have fill of some type. They both need to be natural breaks - the issue in geotech logging is to ensure you exclude counting any breaks which are drilling induced. The move to AI-based geotech logging based on core images or scans has a problem with this. There is great info on geotech logging in the AusIMM's Monograph 30 - Guide to Good Practice in Resource and Reserve Estimation.
Amazing. I am a geologist in Toronto working in geotech. This video is super informative. Thank you sir!
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I am not a geologist--- I have come across many many Core in my life- core cutting and SG test and seen many Mishaps ---some are Positioned wrong way round
How to calculate persistance of joints from cores?
Hi Akash- its not really possible given the short exposure length across core. If you have a joint running down the core axis then you can get some idea of persistence but not spacing! One or the other!
BTW - There is a great paper on geotech logging in core by Andre Van As 2014; Collection of Geotechnical Data from Drill core; AusIMM Monograph 30 Guide to Good Practice; . p109-120. There are a lot of good papers in that monograph - worth the cost. cheers dale
www.ausimm.com/publications/monograph/monograph-30---mineral-resource-and-ore-reserve-estimation---the-ausimm-guide-to-good-practice/
@@dalesims8686 thanks....But then how i calculate RMR from information based on core logs?
@@akashchordiya2210 well its going to be an approximation! People do log persistence in core but the scale of observation is limited. So logging is a blend of art and science with guesswork thrown in! All data has limitations so core is no different so we need to understand the impact of those limitations. Sorry but it isn't a perfect world and our role as scientists is to be able to communicate the uncertainty we have in the analysis of our data to the people who consume our outputs. cheers dale
@@dalesims8686 well thanks for your time!!! Cheers mate!
81.4 - 79.3 = 2.1
And that's what you measured actually!
great pickup! there is always error - including the logger!
My job
Until you look at your soil core and it says that grass is 1 metre below the surface... 🤔
yes something wrong there! Core logging is always detective work!
LOL
Am I just being thick? 3.06m is 3 meters and 6 cm (306cm), not 3 meters and 60 cm (360cm), as said at 9m44s. Apologies if I'm wrong.
thanks Ben - you are likely right! I can check it but if I have mixed something up my apologies! Data collection is prone to error.. cheers dale
@@dalesims8686 ok thankyou
He or she...lolololol