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....at least we can all look forward to a new radar image from Sentinel.
I did have a look at Rudall (or what I think is the bit of stripey red outback that is Rudall) when the last daylight image came out and couldn't see anything that looked like drilling activity.
Others may spot things that I can't.
And if red is actually your favourite colour try this:
https://apps.sentinel-hub.com/eo-browser/?zoom=13&lat=28.60871&lng=-17.92969&themeId=DEFAULT-THEME&visualizationUrl=https%3A%2F%2Fservices.sentinel-hub.com%2Fogc%2Fwms%2Fbd86bcc0-f318-402b-a145-015f85b9427e&datasetId=S2L2A&fromTime=2021-10-10T00%3A00%3A00.000Z&toTime=2021-10-10T23%3A59%3A59.999Z&layerId=4-FALSE-COLOR-URBAN
The La Palma volcano is busy creating a second lively stream of lava, on a more northerly route, that looks likely to reach the sea shortly.... the live webcam footage is also fairly hypnotic, specially from a safe distance.
Will that effect any of our tenements? Before I get slammed I am joking!!! Amazing what nature is capable of.
I look forward to your update Strudel. I meant to comment on your previous post about exploration strategy for magnetic/gravity coincidence targets. I essentially agree with the exploration strategy. Magnetic/gravity coincidences don't always correspond to a mineralised discovery and can purely be a lithological response, but they are targeted because they can indicate precipitation of iron oxides, carbonates and sulfides. They indicate this because magnetite/pyrrhotite presence is indicative of that process. Like I said, it can also be a result of magnetite grains originating from basement rocks, being transported to near surface. Contact points between different types of rock can be magnetised because of this. Some of the drill targets we've come across have been a result of the latter.
I mention of havieron not being related to the magnetic response and I'd strongly disagree. Havieron is related to the response through the way the rock strata has folded, which would have helped in its formation. The pyrrhotite at Hav is likely to have helped as well. I've said before, but the magnetic response can suggest secondary processes that can be an indirect way of finding an ore body. Lower portions of Hav like the eastern breccia would not have shown up in the magnetic response because it's too deep to give a strong response from surface and not because it can't give a magnetic response. The targets around Havieron may not show a magnetic response for a host of reasons. The targets they're looking at might be too deep, they might be looking at zones where they expect magnetite is consumed, etc. In all cases of eastern breccia and targets around Hav, I expect them to have done downhole EM and gravity surveys as well as drill testing. They said they did drill testing of the eastern breccia and I expect a downhole survey of Hav (a large subsurface conductor) showed them how deep the system goes in terms of the depth of the conductive body. That doesn't mean it's mineralised but I would say it's more likely than not becasue the grades have improved at depth. Same applies for the targets around Hav.
Hi Hydro,
I decided to do some hiking in Iceland once and in a (fleeting) moment of being sensible bought a map. I was confused as hell when I perused it in my tent and tried to work out how to get up and back down high bits. There seemed to be very odd semi-circular patches where there were no contours but just numbers - like "1973" or "1955". I couldn't make head nor tail of it, then I realised there were similar red patches with other numbers like "1994".
It was only when I went hiking did it all fall into place - these were the dates of lava flows labelled by year. Black meant you had a chance of crossing it without melting your boots. Anything red was egg frying territory.
Unfortunately lava being lava meant you couldn't walk in a straight line, couldn't see more than about 20yds to the next lump, and everything had had no time to erode and was as jagged as heck.
I tried to cross one bit from the 50s to climb up a local low hill. I gave up when, having tried to traverse the lava for about twenty minutes, I went up to a high bit to see how much closer I was to the hill. It was nowhere on the horizon in front of me - I had been turned 180 degrees whilst trying to get up / over / around / back / forward through the lava.
It took me another week to work out that there is so much iron in Icelandic rocks that compasses are useless - but that's another story from when, due to a misprint in the bus timetable, I was hitch-hiking through their eastern desert and I worked out I was precisely 7.5km west of the ring road.... which was actually at my feet as I sat on a roadside boulder wondering if I was going to even see a car that day.
Hi Malva,
Thanks for answering my gravity plus magnetism query from a couple of days ago - I was worried that much of the good ore at HAV had no signature that could be detected from the surface.... but you assured me in my geological ignorance that this is not the case.
It would have made finding HAV a very lucky fluke with HAD005's results, and make finding the next HAV utterly impossible - unless you believe in luck. I prefer more application of engineering and analysis when picking the next bit of outback to drill.
Strudel, I'd say common sense can take you further than any geological knowledge can provide. You rightly saw the notion that Havieron wasn't related to the magnetic/gravity anomaly would put into question the strategy of exploration geologists around the region (including newcrest and rio tinto). Common sense would say that the real geologists know that they're doing, so I stick to what they say/do. That being said, some targets might not have a magnetic high but those might be targets for different styles of deposit which would be produced under different conditions and give different responses like magnetic lows. Some targets might also have magnetic lows but then are magnetic highs just below surface such as Tama, A11 and A9 targets in the Juri JV. Either way, they are iteratively reviewing data after each drill programme. You'll notice prefect has been removed as a target. It seems they've refined the exploration targeting somewhere around the first few Juri results. At the same time, they've added a number of targets so I'm confident they are not just drilling blindly and have some data behind their decisions. That being said, you've got to have a little bit of luck!