Porphyry copper deposits
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- Опубліковано 4 жов 2024
- Porphyry is a specific type of magmatic rock that forms chiefly within mountain belts. Some porphyry intrusions carry metals and porphyry deposits are the single most important deposit type for copper. Many porphyry deposits are also very important resources for particularly gold and molybdenum. This video by Dr Taija Torvela summarises how, and where, porphyry deposits form, and describes the principle of a process called alteration and how it affects the country rocks around a porphyry. Understanding the principles of porphyry deposit formation and alteration zoning is very important for exploration of porphyry deposits.
This video is part of the UA-cam channel @ourmetallicearth
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Great video - I worked in Papua New Guinea in 1971 looking for porphyry deposits ... wish I had your video then ! Wandering around in the jungle not quiet sure what I was lookng for !
Glad it was helpful! :)
Tell me more about ur journey please
Keep them coming, Taija. I have watched hundreds of geology-related videos, but your style stands out clearly.
Thank you, that's great to hear! :)
I love these educational videos with a scientifc person out in the field showing examples of rock and giving detailed explanation of the geo processes.
Thank you very much, Taija, for the effort, the clarity, and the overall result. Very well made!
Glad you enjoyed it!
Very interesting! It gives me a much clearer view of the natural processes involved.
Thank you, a great summary over view to refresh my 50yr old geology education.
Thank you for this video. I live and work in the area and have been looking for an easy to understand explanation of Glasdir and its copper deposit for years. If you go up the hill from the Glasdir mill ruins, you can find the huge canyon of the mine itself and look down into it. It's quite a contrast to the narrower veins of the gold and other metal mines, in the area.
It's a brilliant video, thanks
Wow amazing video. Gonna watch all of yours now.
Fantastic! Really well structured
Much appreciated Taija... Lovely to see you again teaching...
Well made 👍🏼
Thank you! 😃
Amazing video, definitely sharing it !
Much appreciated!
An excellent presentation of the process for how these deposits form. I was able to fully understand and appreciate this geological process. Up until now, I did not understand why certain mineral deposits form in certain locales and what the process is for their deposition. It makes the source, trapping and accumulation of petroleum deposits seem to be much simpler, though related.
This is so well produced, explained, and filmed, absolutely top-tier educational material. I really appreciate how you showed close-up examples of the rocks, not just chemistry or blurry photos. It's linking together the theory/science with looking at real, actual rocks, that's what's lacking in a lot of online geology content, and you do this very well.
Thank you, glad you like it!
Thanks for making this video. Your did an A+ job. This was really a very effective virtual field trip and it was good to see the alteration zone mineral assemblages first hand.
Such clarity found in these explanations when attempting to locate a copper deposit. Most impressive. I learned so much. Thank you for the gift. Thank you. : )
Your videos on types of deposits are really useful for young specialists in the exploration area. Thank you for providing these. It would be perfect if you could share some articles or other scientific sources.
I also ride along in those videos. For you to climb and risk injury, to bring me right into your world of Geology. A wonderful job. Looking forward for more.
Thank you very much for your presentation and your knowledge!! and greetings from Chile!!
very didactic my teacher couldn't have explained it better
Hello Professor, I really enjoyed your scientific and eloquent words, as few people pay attention to the alterations and the geographical and geological condition of the mines. I praise you.
Thanks Taija very much for your effort and impressive work. Love it
Love it
Mam i am really thankful to you, i was wondering a lecture about porphyry deposits but i did not find before this lecture really help me about porphyry deposits thank very much
Yo’re doing Very Good videos in a easy way to understand. Thanks
Best video on porphyry copper deposits!
Great explanation I am going to share this with some past coworkers. I was happy to hear you say that small mining can help supply more copper for the future. Unfortunately the mining industry has forgotten about small mines and governmental permitting has made it very difficult to get enough financing in advance to get all of the engineering studies and environmental surveys to get permits.
Taija, I really like your videos, partly because I am living on the slope of a porphyr hill and because my familly was involved (some generations ago) in small scale manganese and copper mining.
Thank you very much for the clear explanations.
Thank you, very glad you enjoy them! There are a lot of small historic mines pretty much everywhere, it's always interesting to find out about local industrial history.
Fascinating. Thank you!
you have delivered lecture very simple method and easy understand that you can explain ❤❤❤❤
Great video .. I am working on porphyry copper systems and enjoy the simple way in which this presentation is done...!
Glad it was helpful!
Excellent video, thank you!
Thank you very much for the video🙏, now I'm working as a young Geologist & still learning about the PCD especially in Tombulilato District(Cabang Kiri, Sungai Mak & Kayubulan) Indonesia.
Thank you for very clearly explaining clearly the big picture, many things I had wondered about--
Hey, this is good informative content. Good personable presentation style. Sound recording could be clearer. I will happily watch more such content.
Thanks for the feedback! I will watch out for the audio quality for my next videos, I guess some devices won't play back as clearly as others.
Thank you so much for this gift!..I live in arizona and all the geology is almost the same but hotter!🤠🤘🌵
This is great!
Looking forward to your next copper video!
Coming soon!
boVery nice presentation and very important information about PCD, Thank you for your video and please continue doing, Yes, yes!!, ye!!!
Great video ❤ and style.
5X5 Datil NM USA rock on Taija
Awfully intresting! Clearly the minerals present today show what happened in the past. Thank you!
Interesting I live in Tucson Arizona. I have copper everywhere I go lol everywhere I hike I see nothing but copper and copper mines everywhere.😊
How old are the rocks around the Welsh mine you are showing? When did the alteration happen?
Wow, another great video. How do you do it ;-)
Thank you very much!
Interesting video but I had much trouble understanding it, mainly because porphyry is not defined and there is no mention of common copper minerals like malachite or azurite at the beginning of the video. The word is confusing because it is similar to porphyrins, which are complex organic compounds., which made me think it contains porphyrins. It would have helped to start with the definition: Porphyry is unrelated to porphyrin. It is any of various granites or igneous rocks with coarse-grained crystals such as feldspar or quartz . It comes from the Greek porphura meaning purple, because these rocks often have a purple color.
The rock looks a heck of a lot like giant petrified wood grain, oozing ancient sap now mineralized.
Thank you, Taija. I've heard of Cu porphyry deposits, but never seen one in the flesh. Is the proposed Pebble Mine (copper, gold) a porphyry deposit?
Yes it's a Cu-Au-Mo porphyry
Copper use in EVs will fall as 48v architecture expands to more models after the engineering testbed of the cybertruck. Other OEMs will follow or fail from uncompetitive costs going forward over the next six years. That time span is much less than the planning horizon for major copper mine projects. Overbuilding in the Chinese housing market is another overhang with less transparent data. Copper inventories in China are also an unknown along with the state secrets of their strategic oil reserve.
I was hoping that the origin and subsequent use of the term porphyry was defined in this video. But that's alright. As my oldest brother used to say, "Look it up yourself!"🤓
Professor, the question I had is about the carbonate and silica veins, do they contain precious metals, usually these types of veins that I encounter in my mine are full of gold.
These ones don't contain much precious metals, neither did the original breccia pipes, a little bit of gold and silver but not much. So in this case the source contained pretty much only base metals. There are some gold rich veins nearby though that have been long considered to be orogenic, but we at Leeds think they might in fact be related to the porphyry system.
What caused the grey coloration of the rock at 21:33? If its rich in sulfides why is it not oxidizing to shades of brown, yellow etc?
Parts of the outcrop are a fairly fresh surface, as this is a road cutting. So it hasn't been exposed to the elements for that long so the more massive sulphides haven't rusted yet
Thank you@@ourmetallicearth
I have a question - How big are these deposits? 10'ss of m wide? km wide?
They can get really big. The stockwork mineralisation can be at a km-scale across for big porphyry systems, that's why they can be economic even at fairly low metal grades. The breccia pipes are smaller but richer, typically some 10s of metres across. The North Wales porhyry intrusion complex is in the order of 10 km long and a few km wide, it doesn't really have a well developed stockwork but there are several breccia pipes in the order of some 10s of m across that were historically mined, Glasdir being one of them.
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Looniest comment of the year.
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