MRG Metals Encounters Further High Grade Heavy Mineral Sands at Koko Massava Project

  • Dec 04, 2019 AEDT
  • Team Kalkine
MRG Metals Encounters Further High Grade Heavy Mineral Sands at Koko Massava Project

An explorer of heavy mineral sands (HMS), MRG Metals Limited (ASX: MRQ) has been gaining business traction from its highly prospective and recently acquired Corridor Projects Heavy Mineral Sands, Mozambique. In order to focus on the project, MRQ has relinquished all its Australian projects, showcasing the significance of the HMS Projects.

The Company recently reported further high-grade assay results from Auger samples at the Koko Massava target, which supported by an airborne magnetic / radiometric survey, had followed up wide spaced historic drilling. Since September, the Company has been drilling wide spaced and then infill grid Aircore drilling programs over Koko Massava.

As of 25 November 2019:

  • 48 Phase 1 and 34 Phase 2 Aircore holes were completed at Koko Massava, comprising 4,112.5m of drilling.
  • A total of 1,372 primary samples were collected and 56 QA/QC samples inserted into the sample stream.

Encouraging Visual Total Heavy Mineral Results

MRQ announced that of the 34 holes completed in Phase 2 Aircore drilling, 31 intersected individual 3m sample intervals of over 4% estimated visual THM. 24 of the 34 holes depicted uncut, average estimated visual THM% grades of over 3% over the entire hole depth. Range of 2.9% to 14.0% estimated visual THM, is the highest individual sample intervals in the holes completed.

According to the Company, the host lithology is - red brown, moderately to well sorted, medium grained sand with moderate silt content.

In the third update on the drilling at Koko Massava, the best hole reported was 19CCAC184, drilled to 51m depth, containing 51m @ 5.66% estimated visual THM from surface. This included 9m @ 8.7% estimated visual THM and had an individual sample peak of 14% visual THM.

Following suit was 19CCAC179, 51m @ 5.24% estimated visual THM from surface, including 45m @ 5.7% estimated visual THM. The visual estimated Total Heavy Mineral grades typically range between 1% to 6% from surface to about 18 meters, whereas grades below 18 meters depth in the hole commonly range 3.5% to 8% visual Total Heavy Mineral. The highest visual estimated THM grades (10-14%), appear to be located between 21-48m downhole, depending on the elevation of the hole collar, which suggests there may be a palaeo-strandline in this zone.

  • Aircore drilling of the Phase 1 wide spaced holes (500m x 1000m), defined a large 20km2 footprint of estimated high grade heavy mineral sand with thick zones of very high grade near surface.
  • The preliminary Phase 2 infill drill data has supported this large mineralised footprint and suggests good continuity of the high-grade mineralisation between drill lines (particularly in the southwest portion).

Drilling details

The Aircore drilling was undertaken by Bamboo Rock Drilling Limited – it utilised a purpose-built Thor RC Aircore drill rig with 76mm diameter rods and 80mm diameter Harlsan aircore bits. The Samples are collected via a cyclone as entire 3m composites, and each of it is logged by the Geologist onsite and analysed by wet pan concentration for estimated visual THM percent using a standard procedure defined by the Company and validated by three rounds of laboratory assays.

Aircore Samples Arrive in Perth

The first batch of Aircore samples has arrived in Perth and will be delivered to the laboratory after quarantine treatment. The Company and market experts are eagerly awaiting the results, likely to arrive around 8 December 2019. The second aircore sample batch was granted the Ministry of Mineral Resources permission in November, while the final Customs clearance remains underway (expected to arrive in Perth by 15 December 2019).

The Company is currently in dialogue with suitably qualified consultants to define the scope and deliverables for a JORC code compliant Mineral Resource Estimate and Technical Report.

Moreover, to obtain additional mineral assemblage data, which is a key value driver for HMS projects, several heavy mineral concentrate (HMC) samples have been selected from Auger drill work over the Koko Massava target, on the basis of characterising mineral assemblage for very high grade zones (over 5% THM), high grade zones (3-5% THM), medium grade zones (1-3% THM), and a distribution across the mineralised footprint from east to west.

The Company believes that this data will be collected before the end of 2019 and will form a foundation for additional and more comprehensive mineral assemblage characterisation, needed for the MRE which likely to be published in Q12020.


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