Arrow Minerals controls over 1,100km2 of exploration licences in the Gascoyne Region of Western Australia, with a 100% interest in five tenements covering 890km2 and one tenement (E09/1618) subject to an earn-in joint venture (Mortimer Hills JV). The Project is being explored for lithium-caesium-tantalum (LCT) pegmatites. In June 2016, Arrow Minerals completed a maiden fieldwork programme, aimed at assessing the fertility of intrusive granitic suites within the Project area to host LCT deposits. Three granite suites were extensively rock chipped and assayed, with the Thirty Three Supersuite demonstrating fertile fractionation trends (Mg/Li and Nb/Ta ratios). Arrow Minerals has secured the majority of the “target zone” which is within 10km of the Thirty Three Supersuite. The Project has a well-developed drainage network suitable to first pass surface geochemical exploration. As a result, the Company undertook a project-wide stream sediment sampling programme with the aim of identifying prospects with LCT pathfinder anomalism.
Tenement map showing high priority LCT prospect
In August 2017, Arrow Minerals commenced a maiden RC drilling programme with four mineralised pegmatites drilled. High grade lithium and tantalum was discovered with assay results including:
• GASRC0016: 2m @ 1.71% Li2O from 118m including 1m @ 2.01% Li2O from 119m;
• GASRC0011: 4m @ 1.42% Li2O from 0m including 1m @ 2.00% Li2O from 1m;
• GASRC0009: 2m @ 1.49% Li2O from 106m and 7m @ 122ppm Ta2O5 from 101m; and
• GASRC0007: 23m @ 0.98% Li2O from 0m including 5m @ 1.35% Li2O from 0m and 3m @ 1.22% Li2O from 20m.
In addition, XRD analysis has confirmed the presence of spodumene in several high-grade lithium samples.
Lithium prospects showing drill collar locations and significant lithium and tantalum intersections
The pegmatites of the Malinda Lithium Project show evidence of being highly differentiated and zoned which is similar to the Tanco (Canada) and Bikita (Zimbabwe) pegmatites. The Tanco and Bikita pegmatites show considerable internal variation in minerology and chemistry, which is apparent in the Malinda Pegmatites. This style of zoned pegmatite has produced zones of high grades at both Tanco and Bikita.