Frontier Lithium confirms the “Electric Avenue” target by Channel Sampling 16 m of 2% Li₂O 25 km from the PAK and Spark deposits.
Sudbury, Ontario, June 10, 2020 – Frontier Lithium Inc. (TSX.V: FL) (the “Company” or “Frontier”) is pleased to report channel sampling results from Pennock, a third LCT (lithium, cesium, tantalum) pegmatite, on the PAK Lithium Project. A 1.5 km-long pegmatite dyke was located, which is intermittently exposed and contains white to light grey spodumene and lepidolite. The dyke is oriented in an east-west direction, cross-cutting the main trend of the Bearhead Lake Fault and culminates at a 16 m wide exposed “blow-out” near the western end (Figure 1). During the drilling program on Spark in July 2019, the support helicopter was used to transport a two-person crew to the main blow-out area of the Pennock pegmatite to complete the channeling.
- The entire channel of 16 metres grades 2% Li2O with a 12 m zone averaging 2.35% Li2O;
- The channel is part of a 1.5 km long pegmatite dyke;
- Electron-microprobe on Spodumene confirms low impurities similar to PAK;
- Substantiates fertility of Ontario’s Electric Avenue for high-quality LCT pegmatites hosting rare low-iron spodumene.
Figure 1: Location and Compilation of the Pennock Showing Area
“The overall high lithium grade of the channel coupled with the presence of the unique mineral texture SQUI (spodumene-quartz-intergrowth) and corresponding low impurity spodumene is very exciting.” states Garth Drever, VP Exploration. “This is another landmark on the Project supporting the Electric Avenue as a rare, high-quality North American corridor for LCT Pegmatites”
Summary information including the location of the channel and mineralized intercepts is shown in Table 1 while Figure 2 contains photographs of the blow-out area where the channel was cut.
Table 1: Summary of Channel sampling at Pennock Pegmatite
Figure 2: Photographs of the Pennock Pegmatite showing Blow-out area and location of channel sampling
The 16 m channel averaged 1.96% Li2O with a 12 m length at 2.35% Li2O. Much of the exposed surface has textures similar to the SQUI (Spodumene-Quartz-Intergrowths) at PAK where the spodumene laths have a preferred orientation as shown in Figure 2 rather than random “jackstraw” textures.
The Electron Microprobe work (initially report in Press Release dated February 28, 2019) was expanded to include polished thin sections from the summer drill program at Spark and the channel sampling at Pennock. Polished thin sections were prepared from 14 outcrop, channel and diamond drill hole samples from the Spark pegmatite and 3 outcrop and channel samples from the Pennock showing for the purpose of quantitative analysis of spodumene using electron probe microanalysis. The goal was to quantify the contents of inherent iron, sodium, and other major elements within the spodumene.
In total, 236 analyses were performed on the Spark thin sections and 43 analysis on the Pennock sections. Figures 3 and 4 summarize the contents of Fe and Na in spodumene, which are the two most abundant substituting elements. Spodumene from the Spark pegmatite has iron contents ranging from below detection (0.03% Fe2O3) to 0.51% Fe2O3, averaging 0.16% Fe2O3. Spodumene from the Pennock “blow-out” outcrop has iron contents ranging from below detection to 0.28% Fe2O3, averaging 0.06% Fe2O3. Spodumene from a dike 380 m to the southeast of the Pennock outcrop has similar Fe2O3 contents averaging 0.05% Fe2O3. In comparison, spodumene from the Lower Intermediate Zone (LIZ) and Upper Intermediate Zone (UIZ) at the PAK deposit average around 0.09% and 0.03% Fe2O3 (Figures 3 and 4A), respectively.
Figure 3: Scatter plot showing Al2O3 vs. Fe2O3 in spodumene from results of electron microprobe; Fields for spodumene in the upper intermediate zone (UIZ; solid line) and lower intermediate zone (LIZ; dashed line) at the Pakeagama Lake pegmatite (PAK) are shown for reference; LLD = lower limit of detection
Figure 4: A – Box plot showing the distribution of Fe2O3 within spodumene from the Spark pegmatite, the Pennock outcrop and dike, the upper intermediate zone (UIZ) and lower intermediate zone (LIZ) at the Pakeagama Lake pegmatite (PAK); sample counts are shown in Fig. 4: B – Box plot showing the distribution of Na2O in spodumene from the same localities displayed in A
Spodumene from the Spark pegmatite and the Pennock showing have sodium contents ranging from 0.04 to 0.13% Na2O, averaging 0.08% Na2O which is similar to Spodumene at the PAK pegmatite (Figure 4B). The other major elements analyzed, which are Ti, Mg, Mn, Ca, and K, were near or below the lower limit of detection in all the analyses and do not constitute a significant component of spodumene from either location.
All scientific and technical information in this release has been reviewed and approved by Garth Drever, P.Geo., the qualified person (QP) under the definitions established by National Instrument 43-101. Under Frontier’s QA/QC procedures, channels are cut with a motorized circular diamond saw, and are 4 cm wide and 10 cm deep. The channels are typically oriented perpendicular to the strike of the pegmatite internal mineralogical zones and are cut continuously across the zones. The samples are removed using a hammer and chisel. The length of a channel is determined by the width of the pegmatite zone. Sample lengths typically are 1 metre but can be less depending on zone mineralogy and boundaries. Samples are described, placed into a poly sample bag with a numbered sample tag and then shipped to the assay lab for quantitative multi-element analysis.
All samples were assayed by AGAT Laboratories Ltd. (“AGAT”), an ISO accredited laboratory in Mississauga, Ontario. Sample blanks along with tantalum, lithium, rubidium and cesium certified reference material was routinely inserted into the sample stream in accordance with industry recommended practices. All petrographic sample preparation and electron microprobe (EMP) analysis was completed at the Queen’s Facility for Isotope Research (QFIR) at Queen’s University in Kingston, Ontario under the direct supervision of Dr. Steve Beyer. Field duplicate samples were also taken in accordance with industry recommended practices.