PM1 defines large lithium-tantalum soil anomalies
Pure Minerals (ASX:PM1) yesterday updated the market with results from its maiden exploration programme at its 80%-owned Morrissey Hill project located in Western Australia’s Gascoyne region.
During August, the company commenced an initial soil sampling survey and rock chip sampling programme over the northern portion of its 59 square kilometre Morrissey Hill Project in order to determine the project’s prospectivity for lithium-tantalum mineralisation.
PM1 collected 133 samples on a 200m x 800m grid during its soil survey. The soil sampling program was designed to identify lithological packages with anomalous pathfinder elements for lithium-caesium-tantalum pegmatites (Li, Cs, Ta, Nb, Rb) which could indicate sub-cropping prospective pegmatites.
Given that the area is known for its multiple pegmatite intrusions and fractionated granites with the potential to host lithium mineralisation, it was no surprise that the soil sampling successfully delineated two key anomaly areas within a broad caesium anomaly above 10ppm Cs.
At the same time, it’s worth noting that this is an early stage play and investors should seek professional financial advice if considering this company for their portfolio.
A significant elevated lithium-tantalum anomaly of more than five kilometres long and up to one kilometre wide was delineated. Results included up to 0.045% Lithium oxide (Li2O) and 20.9 ppm Tantalum pentoxide (Ta2O5) (MSS0053).
Two additional tantalum anomalies of 1.6km x 1.4km and 1.0km x 0.4km were also defined with results up to 18.9 ppm Ta2O5 (MSS0025).
These can be seen on the map below:
The company also collected 50 rock chip samples from various pegmatite and granite outcrops within the soil sampling grid and its surrounds. These will supplement historic rock chip samples sampling which, in the northern Li-Ta anomaly, registered grades up to 1.31% Li2O and 238.7 ppm Ta2O5.
Encouragingly, these results have similarities to initial results from Segue Resources’ (ASX:SEG) Malinda (formerly Reid Well) lithium discovery, located less than ten kilometres to the east.
In an encouraging sign for PM1, in September 2017, Segue announced assay results from the first six holes of its maiden RC drill programme that intersected thick zones of pegmatite of grades greater than 1.0% Li2O.
The location of Morrissey Hill and the nearby Malinda can be seen on the map below.
The next step for PM1 is infill sample of the areas showing the strongest lithium and tantalum anomalies in the soil sampling program to enhance the definition of the anomaly for improved drill targeting.
An 80 mesh fraction will be trialled to determine if this improves the resolution of the anomalous area. In addition, PM1 Minerals will take further rock chips samples and undertake petrographic analysis to identify the lithium and tantalum minerals in the rock chip samples, as well as characterise the different pegmatite phases.
PM1 Executive Director and CEO, Sean Keenan, commented on the results:
“The large size of the lithium and tantalum anomalies, plus the similar orientation relative to the pegmatites mapped at the nearby Malinda discovery, are very encouraging. We believe the project warrants additional sampling and mapping to enhance the resolution of the anomaly with the ultimate goal of developing priority drill targets.”
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