Hornby Lake Assays Confirm Presence of Fractionated Pegmatites
Eleven whole rock samples collected during the field work were sent to ALS Sudbury for analysis using the ME- MS61 package with four-acid digestion. This method analysed for 48 elements (Ag, Al, As, Be, Bi, Ca, Cd, Ce, Co, Cr, Cs, Cu, Fe, Ga, Ge, Hf, In, K, La, Li, Mg, Mn, Mo, Na, Nb, Ni, P, Pb, Rb, Re, S, Sb, Sc, Se, Sn, Sr, Ta, Te, Th, Ti, Tl, U, V, W, Y, Zn, and Zr).
Assays received from the maiden Hornby Lake field program confirm the presence of fractionated LCT-type pegmatites with anomalism consistent with fertile granites in Ontario.
The Company has commenced planning a 2024 field program to target the south-western portion of the Project area.Fieldwork will target the area south and southwest of the central region of the Project where fractionated pegmatites were encountered in the 2023 field program.
A summary of the results is shown below in Table 1:
The assay results show overall low concentrations of LCT pegmatite suite elements (lithium, caesium, niobium, rubidium, tin, tantalum), with some low-level anomalism of caesium, niobium, rubidium, and tantalum (Table 2). The data confirm the pegmatites in the central part of the claims as being weak to moderately fractionated and that the granites are low-Ca and peraluminous. The highest concentration of lithium was 77.7 ppm (20230917- 010; Table 2), but is below levels considered anomalous (90 ppm, 3x crustal average) in whole-rock geochemistry samples.
The samples show no clear mineralisation trends (Figure 2) and suggest that although there is low ranging lithium anomalism, it is too low to indicate potential economic mineralisation within the visited claim area. However, the whole-rock concentrations of LCT-suite elements in the pegmatites and one granite sample from the Hornby Lake area are within the range of fertile peraluminous granites elsewhere in Ontario (Table 3).
Analysis of Results
The 2023 exploration program undertaken by Ronin on the Hornby Lake project is the first program targeting LCT mineralization in the area. The primary focus of the first pass exploration was the central to northern segments of the project, targeting outcropping interpreted pegmatites from historical work and analysis of aerial photography.
The large granitic veins in the north of the project area were determined to be pegmatoidal biotite leucogranites, and not true pegmatites. The pegmatite-like outcrops within greenstones further south in the central east area were found to be complex pegmatite dykes with variations in crystal size from megacrystic to coarsely crystalline, garnet bearing aplitic phases, and rare patches containing muscovite.
The pXRF analysis of K-feldspar and whole rock assays determined the large pegmatoidal granite dykes in the north of the claim are unfractionated to very weakly fractionated. These are unlikely to be related to an LCT pegmatite system. The more complex garnet and muscovite bearing pegmatites in the central east of the area are weakly to moderately fractionated and show minor elevations of caesium and tantalum in some of the more fractionated pegmatites.
The fractionation data suggest that although the confirmed pegmatites contain no lithium mineralisation or favourable fractionation levels for lithium mineralisation, they do show a general trend of increasing fractionation from the unfractionated pegmatoidal granite dykes in the north to south. A westerly increase in fractionation was also observed from pegmatites east of the claims area into the claims.
The most fractionated pegmatites identified in the Project were some of the garnet and muscovite bearing pegmatites sampled in the central east area (Figure 1). White linear features apparent in Bing satellite/aerial imagery that appear similar to these confirmed pegmatites occur southwest (Figure 1). To the south, pegmatites have also been recorded in the historical mapping and recorded in drill hole logs (Figure 1; Mullan and Bell, 1968). Although these are recorded as being thin, they demonstrate that pegmatites occur further south in the claims where no features are apparent in the satellite and aerial imagery.
The Company believes based on fractionation trends, anomalous LCT indicator minerals from whole rock assaying, identified linear features in imagery similar to confirmed pegmatites, and historically recorded pegmatites, the south and southwest areas of the Hornby Lake Project remains prospective for potential lithium mineralisation.
Next Steps
The Company has commenced planning a 2024 field program targeting the south and southwestern extents of the Hornby Lake Project. The proposed program will follow closely with the procedures established in the 2023 program, including field reconnaissance, rock chip sampling and include potential channel sampling.
The program is expected to commence in H12024.
Assay data confirms the pegmatitic and pegmatoidal granite dykes in the northern section of the project are unlikely to be part of an LCT pegmatite system. The Company will discontinue its interest in this section of the Project.
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