Open Geoscience Talks every Wednesday with a focus on mineral resources. More than half of our recordings are not public, and can only be accessed through the website archive: oredepositshub.com/archive/
This was fascinating- thank you! A question if you are still checking comments: in order for the precipitation of uranium to occur, the reductant material would need to be in a peaty, lignite, or similar state, right? Once the organics have been fully petrified (like the log in one of your slides) modern meteoric water would no longer have a reductant to cause precipitation, right?
MIAMI, Sept. 26, 2023 (GLOBE NEWSWIRE) - North American Strategic Minerals Inc., a private US Delaware corporation, was formed in 2020 to explore for rare earth metals after its founders recognized a significant new geologic model for rare earth mineralization hosted in paleo basin pelagic sediments. Similar rare earth mineralization was first noted in modern basin pelagic sediments found at various locations on the Pacific seafloor. The mechanism of formation of this new type of rare earth mineralization is the direct precipitation of these critical metals from seawater into seafloor pelagic sediments. Article content The largest and most important of these rare earth seafloor metal precipitate deposits is known as the Minamitorishima deposit in the western Pacific. Technical details of Minamitorishima were first published in 2018 by a consortium of Japanese scientists who described this world-class rare earth deposit as having the potential “to supply these metals on a semi-infinite basis to the world.”1 Minamitorishima is considered to be the largest rare earth deposit in the world eclipsing all terrestrial deposits documented in China, Australia, Brazil, Vietnam, Greenland and elsewhere. The Japanese are currently investing six billion Yen to advance and develop the Minamitorishima deposit. Article content After recognizing the significant importance of this new style rare earth mineralization, NASM has applied this new target model to its exploration activities in paleo basin sediments at various localities of North America since 2020. NASM’s rare earth targets are found in a unique and very specific paleo basin sedimentary facies containing significant stratiform rare earth mineralization. This new style of rare earth mineralization discovered is distinctly different from common black shales or coal bearing sediments typically found throughout the world containing trace amounts of various minor metals. Top Stories Top Stories Get the latest headlines, breaking news and columns. youremail@email.com Sign Up By signing up you consent to receive the above newsletter from Postmedia Network Inc. Article content Article content The rare earth metals discovered by NASM are contained in paleo basin pelagic sediments as in-situ diagenetic elemental substitutions primarily within the crystal lattice of biogenic calcium phosphate minerals. Geochemical sampling on the Company’s primary target at its Lost Basin project has encountered grades between 0.1% and 0.5% Total Rare Earth Oxides (TREO). The average grade of Minamitorishima is 0.1% TREO. Biogenic calcium phosphate concentrates are shown to contain up to 2.0% TREO at both Minamitorishima and at NASM’s primary exploration target. This style of biogenic calcium phosphate rare earth mineralization is also very important as it is found to display rapid and high leach recoveries as reported by the Japanese researchers at Minamitorishima. Comparative data from both Minamitorishima and NASM’s primary project area indicates Heavy Rare Earth Oxide contents of +35% TREO. _______________ 1 www.nature.com/articles/s41598-018-23948-5 Mineral rights covering over 200 square kilometers have been secured by NASM and its wholly owned Canadian subsidiary on multiple targets in southern Manitoba and central South Dakota as NASM continues to explore this extensive sedimentary basin region for rare earth mineralization. Further evidence that this region contains this unique style of paleo basin metal precipitate mineralization is highlighted by the fact that central South Dakota contains the world’s largest paleo ferromanganese nodule deposit in the 4,000 square kilometer region centered around the town of Chamberlain. This paleo Fe-Mn nodule deposit is in many respects similar to the vast Clarion-Clipperton modern seafloor ferromanganese nodule field in the central Pacific. Article content Other new targets identified by NASM are also found to host this style of paleo basin pelagic sediment stratiform rare earth mineralization in three States in the mid-Continent region of the US. NASM is continuing to explore these new targets which, in places, contain laterally uniform and continuous grades of 0.15% to 0.2% TREO over strike length distances of 50 kilometers as seen from initial sampling. Recently, in July 2023, Chinese researchers announced the discovery of “paleo-continental sedimentary rare earth deposits”2 in Sichuan, Yunnan and Guizhou Provinces and published that “these deposits have advantages over ionic clay rare earth deposits.” We now believe that the Chinese rare earth industry has recognized and discovered the importance of this exact same style of rare earth mineralization that NASM has previously identified and has been working on since 2020. The nearly identical host rock lithologies, mineralogy and rare earth grades between NASM’s paleo basin pelagic sediment rare earth targets and the world-class Minamitorishima Pacific seafloor deposit is strong evidence supporting the discovery of a significant new rare earth deposit type. Article content Next month, NASM’s Executive Chairman, Michael Thomsen, will be attending Metal Event’s 19th Annual International Rare Earths Conference in San Antonio, Texas on October 19-20 and will be available to discuss NASM’s projects with potential investors. For further information on North American Strategic Minerals Inc: Website: www.strategicminerals.us Contact details: info@strategicminerals.us Francis Boulle, President & CEO - Founder Michael Thomsen, Executive Chairman - Founder
Great talk. Gave me some insight on the viburnum trend district. I'm actually trying to prove hydrothermal fossils in sedimentary rock due to brine migration and possibly hydrothermal vents in the Ordovician record near a lead deposit.
The talk begins with mention of Lihir and Emperor, and surely these are examples of the top, "lithocap" of alkaline porphyry systems. At Lihir a sericite pyrite Illite cap lies above an intense potassic altered, anhydrite veined, monzonite core, with elevated Cu Mo (not economic). No albite present. The illite Phyllic cap get more illite rich as you approach the surface, (it holds much of the gold), where it is capped by intense kaolin rich blanket, in turn capped by Alunite rich/ slice bleached rocks forming around and below the active hot springs (h2S rich). It is described as a low sulphidation deposit. Yet there is no shortage of sulphur. The Sericite zone has >5% pyrite. The potassic zone is about 20% anhydrite. The top Alunite zone has alunite and pyrite. the Alunite zone is up to 50m thick. but is being actively eroded. (no gone to mining). Emperor is a bit different, asked by infill sediments.
Do you have a comparison between magnetotelluric resistivity models as well as 3D inversion magnetic models in areas with high resistivity and magnetic susceptibility contrast similar to that you conducted to map the gabbro intrusion contact with metamorphic rocks. I think that the AMT and or CSAMT methods are more appropriate to map such structures controlling location of ore mineralization. May be the passive seismic method can be applied in areas with lots of high power lines that prevent using the AMT and CSAMT methods.
Most deposits I’ve seen or read about have structures observable in drill core that bound alteration zones on one side, thus predate the alteration and controlled the flow of the fluids. Veins, joints, shears, faults, folds, I’ve seen all of them exhibit this characteristic.
Highlights: ✦Kathryn Goodenough talks about the importance of lithium pegmatites in Africa for low-carbon transition. • Lithium pegmatites are important for the low-carbon transition. •Kathryn Goodenough is reviewing lithium pegmatites in Africa with her colleague Richard Judith Kinnaird. •She gives a high-level overview of lithium pegmatites. •Lithium and rare earth elements are critical metals used in modern technology. ✦Lithium from hard rock sources, particularly pegmatite, comes from Australia, China, and Zimbabwe. •Half of the world's lithium supply comes from South America's evaporative brines. •The other half of the supply comes from hard rock sources, mainly pegmatite. •The majority of lithium mined from pegmatite comes from Australia, with some production in China and Zimbabwe. ✦Lithium pegmatites can form from the partial melting of metal sedimentary crust and require an appropriate source of minerals to produce rare metal-enriched pegmatite. Click to expand •Two models of lithium pegmatite formation exist: from parental granite bodies and from partial melting of the local crust. •Lithium pegmatites contain a wide range of different ore minerals, including silicate minerals like Spodumene, Petalite, Lepidolite, and other lithium and phosphates. •Recognizing all the different minerals in lithium pegmatites is challenging, but necessary when working with these rock types. ✦The video explains the geological history of Africa and the distribution of lithium pegmatites across the continent. •Africa has central cores pushed together over time through orogenic events. •Lithium pegmatites are found in different regions of Africa, including the Kalahari Craton, West Africa, Central Africa, and Namibia. •The pegmatites have been mostly dated and studied by Frank Miller and his team at the University of Leoben. ✦The Arcadia project in Southern Africa has the region's largest JORC-compliant lithium reserve. •The reserve contains 26.9 million tonnes at 1.3% lithium oxide. •The pegmatites in the project have low iron helpful petalite for ceramics and spodumene useful for battery production. •The project has a series of stacked pegmatites, which is typical for LCT pegmatite prospects in Africa. ✦The section discusses the age and distinctive features of lithium pegmatites in Africa. Click to expand ✦There are three main lithium projects in Africa: Lelau in Mozambique, Caribou in Namibia, and Contigo in Ethiopia. •Pan-African pegmatites are enriched in tin or tantalum, but not necessarily lithium. •Lithium-enriched areas are substantially younger than Pan-African granites and geochemically different. •Not all LCT pegmatites are related to parental granites. ✦The speaker discusses the replacement of quartz with growth and the disruption of their work due to COVID-19. •Samples from camera TV have been worked on by Richard Shaw. •Some samples are still in Harare due to the lockdown. •Muscovite chemistry is a good indicator of the prospective for lithium. •They hope to build up more data to show how muscovite chemistry can be used.
An economist's view is that commodities keep pace with inflation in the long run. A commodity is a basic good used in commerce that is interchangeable with other goods of the same type. Zinc is a commodity as it is freely traded and not stored as a hedge against inflation, wars or other upsets. Gold is not a commodity as it is often hoarded, not always freely traded and in the past its price was controlled.
A menos que esté equivocado, he visto un foto de usted con la isla de "Ireland's Eye" al fondo! Que yo sepa, ne tenemos yacimientos IOCG aqui, desafortunadamente...
It's a mistake to call rhodonite or bustamite as retrograde skarn. The replacement of pyroxene by manganese silicates it's a metasomathic process completely anhydrous.
How many actual African people does this help? Does African human resources mean labor only? Do African people own the mining rights to the minerals? What is your organization going to do to insure the African people are not exploited by foreign influences or African dictator influences? These are legitimate questions that should be widely broadcast. My best regards in your endeavor to help the world and African communities.
Thanks! Any thoughts on Dundas Minerals sulphide discovery nearby? Would you expect to find any copper or nickel sulphides in zones somewhere in the system?
