Above: Map of southeast Manitoba showing the Donner and Falcon West lithium/cesium projects.
The Donner Lithium Property is a 75% Grid / 25% Li Equities Investments LP, formerly Lithium Royalty Corp. (LRC) joint venture. Terms of the joint venture transaction can be found in the press release dated January 14, 2022 (HERE). Tanco and LRC each have a 2% royalty interest on the Donner project. The Donner project contains a NI 43-101 compliant lithium resource of 6.81 million tonnes (“MMt”) (Inferred) grading 1.39% Li2O (see press release dated July 18, 2023 HERE).
In additional to lithium, the project contains the extremely rare cesium mineral, pollucite, at the High-Grade (“HG”) Dyke. The dyke has seen limited exploration with drilling completed in the 1980’s for tantalum. Pollucite is only formed in the most fractionated LCT-type pegmatite bodies and is only known from a very small number of localities, globally. A select composite surface grab sample from the High-Grade Dyke taken in 2024 returned 17.5% Cs2O associated with coarse-grained pollucite. Grid completed 28 diamond drill holes totalling 827 metres targeting the near surface portion of the High-grade ("HG") dyke in early 2025.
The High-Grade Dyke is situated within the area of Grid’s Advanced Exploration Permit (“AEP”) that allows Grid to complete a 10,000-tonne bulk sample, subject to the posting of a reclamation bond.
Above: Map of the Donner project with location of HG Dyke and proposed drill holes.
Cesium Agreement with Tantalum Mining Corporation of Canada Limited (Tanco)
Grid announced a cesium supply agreement (the “Agreement”) with Tanco at the Donner project on February 18, 2025 (see press release HERE). The Agreement provides funding for drilling and project development up to CAD$1.2 million with the objective of Grid toll milling cesium ore at the operating Tanco Cesium plant at Bernic Lake. Initial drilling will focus on the cesium-enriched High-Grade Dyke (“HG”) at Grid’s Donner lithium/cesium project, located 35km from the Tanco Mine Site.
Terms of the Agreement
- Initial CAD$300,000 for first phase drilling at HG Dyke
- Follow up CAD$900,000 for project development/permitting
- In exchange, Tanco will have the right to purchase 10,000 tonnes of cesium-bearing material grading at least 5% Cs2O for a price of US$300/t per 1% Cs2O with deductions applied for transport.
- The advance payments received will be deducted from the proceeds of cesium sales to Tanco.
