MRG receives ‘encouraging’ first-pass soil sampling results

MRG Metals (ASX:MRQ) has received ‘encouraging’ initial results from the first-pass soil sampling programs at Lake Johnston and Forrestania in Western Australia.

MRG Metals Chairman Andrew Van Der Zwan says the results from the recently acquired Lake Johnston and Forrestania lithium projects is pleasing.

“This area of Western Australia is emerging as an exciting lithium region and it is pleasing we have been able to identify several significant targets just months after acquiring these assets. MRG is currently planning follow-up activities at both projects which will include infill and extensional grid soil sampling to further investigate the early potential we have uncovered.”

HGS Australia (HGS) conducted a review of portable XRF results from the lines of soil sampling.

Lake Johnston comprises 2 granted tenements, E63/2394 & E63/2446, covering 296km-square located 115km west south-west of Norseman. The projects are within a region of limited past exploration but fit within the now known lithium Lake Johnston Lithium Corridor hosting lithium discoveries Burmeister (TG Metals), Medcalf & Mt Day (Charger Metals).

The Forrestania project comprises a tenement, E77/3164, covering 31km-square, is located within a ‘world-renowned’ lithium corridor host to one of the largest lithium deposits owned by Wesfarmers (ASX:WES).

Closer to the project site is Forrestania Resources with their Bannon and Iron Cap lithium projects currently being explored following surface spodumene identification.

The soil sampling program was split into 3 areas designed to intersect structures that may host prospective geology for lithium deposits.

The samples were collected by All Point Sampling in February 2024 with all of them sieved to -2mm and samples collected at the alpha horizon some 20cm below surface.

HGS conducted pXRF on all samples and reporting of results. The samples were analysed using an Olympus Delta 50 portable XRF (pXRF) which is setup for 38 elements comprising base metals and REE.

MRG says the results have highlighted 2 prospective areas that warrant infill/extension soil sampling with the goal of identifying drill targets.

The company note the ratio of high to background values in low though the repetitions of associated elements assist in defining probable areas. The samples all return looking yellow in colour therefore of low iron content and probably associated with an underlying granitoid.

The locations defined have supporting elements of Rb, Ta and to a lesser extent, Sn. Other elements of Y, Th and Sr and commonly found within alkali intrusives and may be supportive of a pegmatite in the region.

MRG says the recommendation is to either select a few samples for laboratory analysis for 4 acid digestion or to conduct infill sampling on a regular grid at the recommended locations.

The company says probably the most prospective of the 3 areas in terms of mineralisation extensiveness and ratio of high to background results. Most samples returned significant Rb results and appears to have a northwest trend along the eastern side of the tenement.

The Rb is well supported with Ta, and there are significant trends of Sn, Sr, Th, Y & Ba. The latter results are used in defining alkali intrusives and pegmatites. The limited magnetics suggests probably supporting structures.

The recommendation for this area is to have all samples analysed via 4 acid digestion multi- element analysis to define better trends and probable LCT pegmatites.

As with Forrestania, MRG notes that this location is probably sitting over a granitoid though the samples were browner in colour indicating a higher iron content.

There are 3 locations of interest defined from the Rb & Ta with other alkali supporting elements of Y, Th, Sr & Sn. The lack of barium could be a result of the intrusion being within a granite and not greenstone.

The recommendation for this area is to have all samples analysed via 4 acid digestion multi-element analysis to define better trends and probable LCT pegmatites.

Write to Adam Orlando at Mining.com.au

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Written By Adam Orlando
Mining.com.au Editor-in-Chief Adam Orlando has more than 20 years’ experience in the media having held senior roles at various publications, including as Asia-Pacific Sector Head (Mining) at global newswire Acuris (formerly Mergermarket). Orlando has worked in newsrooms around the world including Hong Kong, Singapore, London, and Sydney.