Raleigh Lake Project
The Raleigh Lake Project consists of spodumene bearing lithium-tantalum pegmatites located in Ontario, Canada. The region is host to several lithium occurrences, including the Company’s Mavis Lake joint venture project. The area exhibits excellent infrastructure that includes sealed roads, rail service and electric power. The project is in close proximity to other mining projects, towns and the port city of Thunder Bay offering a skilled labour force and excellent mining related services. The Raleigh Lake Project is owned 100% by ILC, with no underlying royalties.
The Project is located approximately 25 kilometres west of Ignace and 235 kilometres west of Thunder Bay, ON. It is easily accessed by a well-maintained network of logging roads that branch south from Highway 17 (Trans-Canada Highway) along Doreen Lake road.
The Raleigh project is ideally located adjacent to the Trans Canada Highway. Rail and electrical power infrastructure is also in close proximity to the project making an ideal scenario for an industrial mineral mining operation.
Raleigh Lake Claims
The Raleigh Lake Project claims cover approximately 3027 hectares. The Raleigh Lake Project is owned 100% by ILC, with no underlying royalties.
Mineralization at Raleigh Lake
Pegmatites and corresponding lithium, and cesium/rubidium mineralization trends were identified in 1999 by a previous operator searching for tantalum mineralization.
Geology and Pegmatite Emplacement at Raleigh Lake
The “Two Mica Granite” (13) is thought to be the source of the lithium-cesium-tantalum (LCT) pegmatites at Raleigh Lake.
Pegmatite emplacement is commonly depicted as concentric zones emanating from the source pegmatite with the simpler and more barren varieties closer to the source and the more complex lithium-tantalum enriched pegmatites further away.
The zonation and emplacement of the enriched pegmatites is also dependent on the structural conduits and traps available to the migrating pegmatite melt as defined by Cerny, 1989.
Mineralization Emplacement Model
- Structural analysis of regional gravity and magnetic surveys shows trans-tensional faulting is extensive at Raleigh Lake.
- Trans-tensional faulting provides the structural conduits to transport lithium bearing magma and creates space to form large pegmatite intrusions.
- The circled area is known mineralization defined by previous operators.
- It is approximately 600m x 400m and underlain by shallow dipping and flat lying pegmatites rich in tantalum and lithium mineralization.
- The coloured dots are lithium values in lithogeochemical samples.
Cross Section NW-SE
- The stacked pegmatites gently dip below the surface and flatten out at depth.
- The number and thickness of the pegmatites appears to increase toward the southeast (SE).
The results presented here were derived from publicly available assessment reports written by previous operators on the Raleigh Lake project. The reports appear to have been prepared by Qualified Persons as defined by National Instrument 43-101, but no Qualified Person has verified these results on behalf of International Litihum Corp. The reader is cautioned that the results achieved by International Lithium Corp. may not replicate these results. The intercepts reported appear to be drill hole intercepts and not the true width of the mineralized zones with true width presently unknown.
In 2019 a UAV-MAG survey was carried out on the newly acquired claims and subsequently merged with 2016 UAV-MAG survey. A map showing a gridded image of the merged data sets is given below. The magnetic body interpreted to be the gabbroic host to the pegmatites is clearly visible in the eastern-central portion of the map. It measures approximately 3 kilometres by 1 kilometre and is comparable in size to the gabbroic rocks hosting the mineralized pegmatites at the Tanco mine.
The Two-mica granite is coarsely mapped in at the south-western extent of the survey area. It is thought to be the parental magma source for the spodumene bearing pegmatites at Raleigh Lake. It is located between four and six kilometres from the gabbro indicating that the gabbro is the optimal distance from the magmatic source body for fractionation to favor the lithium-tantalum mineralization.
Several regional structures can be interpreted from the magnetic image. Structures transcend from the Two-mica granite to the Raleigh Lake gabbro and as interpreted above, form structural traps for pegmatite emplacement. The structures cut the gabbro at its northern terminus, in the vicinity of the historic drilling, and in the central (thickest) portion of the body. No drill holes have tested the main gabbro body and as indicated above, the historic drill holes have intersected spodumene bearing pegmatites that dip gently southeasterly and flatten as they intrude the edge of the gabbro. There is a striking resemblance to the emplacement style of mineralized pegmatites at Tanco making the Raleigh Lake gabbro a highly prospective target.
The flat lying nature and zonation of the pegmatites at Raleigh Lake bears a resemblance to the Tanco pegmatite at Bernic Lake.
- Discovered in 1929 completely hidden under Bernic Lake, Manitoba
- Consists of a sub-horizontal body 1.5 km x 1 km and up to 100m thick.
- Mined since 1967
- Global role in the production of Ta, Cs & Li
- Mineralization is increasing in direction of the magnetic anomaly
- Structures define interpreted mineralized conduits
- Geochemistry defines mineralized conduits
- Magnetics define structural traps and expansion zones that can host large fractionated
pegmatites similar to Tanco
Comparing Raleigh Lake to Tanco
In February of 2010, P. Vanstone of Vanstone Geological services and former Chief Geologist at Cabot Corporations’ Tanco Mine was commissioned by Abaddon to conduct a property and diamond drill core review. Key comments from his report confirm that the pegmatite fractionation trends [at Raleigh Lake] are towards the southeast. Additionally, there is a prominent gabbroic hosting body encapsulating pegmatite #1, and this information, along with sheared contact relationships caused by reactivated structural features, multiple pegmatite phases insinuates a complex pegmatite emplacement history that adds exceptional value to the Project and its potential to host a significant pegmatite body (Vanstone, 2010).
Plans for 2020
For the reasons described above, ILC considers Raleigh Lake to be an extremely promising property. However it is in the nature of mining exploration that further validation is required to prove whether or not a deposit really is major, and until proven there is always a risk that it will not in fact be as promising as it may appear. To this end ILC intends carrying out further exploration to try to validate the potential of this prospect with the intention to drill a further 20 or more holes on the property as soon as funding becomes available.