Avalon Advanced Materials Inc. (TSX: AVL and OTCQB: AVLNF) (“Avalon” or the
“Company”) announces that the preliminary results from the winter 2023 diamond drilling program has
potentially expanded the lithium resource at the Company’s Separation Rapids Lithium Project. Thirteen
holes totalling 4179 metres were drilled on the central main mass depth extensions of the resource. Of
note, the final hole totalled 570 metres vertically through the deposit and confirmed visual petalite
mineralization to a depth of 565 metres. This increases the potential depth of the deposit by 80% from the
previously tested 315 metres deepest intercept. The other twelve holes intersected mineralization to the
east, west and at depth from the existing resource and justify completion of an updated resource estimate
for the Separation Rapids lithium deposit. Assays from four of the holes are pending.
Drilling Program Details
The winter 2022/23 diamond drilling program included twelve drill holes on the existing resource and one
vertical drill hole on the main centre of the deposit designed to examine the potential depth extent of the
petalite mineralization. Twelve holes were designed to undercut historic maximum-known mineralized drill
intercepts on the widest part of the Separation Rapids as step outs to expand the existing resource. The
main deposit consists of a large, zoned vertical pegmatite dyke averaging 50-70m in thickness that has
been structurally flattened, that includes both petalite and lepidolite accompanied by many narrower
mineralized dykes of similar but variable lithium mineralogy. The dominant lithium mineral is petalite. The
dykes tend to be lepidolite-rich on both the east and west extensions. Lepidolite is a lithium mica typically
containing 7-8% Li2O content while petalite typically contains 4-4.5% Li2O, but with no impurities.
The twelve holes were drilled over a total strike length of about 300 metres. Six holes (SR-22-81 to SR23-86, assays for SR-23-85 pending) were designed to intersect the main part of the zone below existing
drilling and were successful in extending the mineralization to depth (Table 2). Four holes (SR-23-87 to
SR-23-90) were on the eastern extension of the deposit, which hosts both the lithium-bearing mica,
lepidolite, as well as petalite; three of these were successful in extending the eastern mineralization (SR23-90 assays pending). Finally, two holes (SR-23-91 to SR-23-92) were drilled on the western edge of the
deposit. With SR-23-92 intersecting lithium mineralization, the deposit was extended to the west (SR-23-
91 assays pending).
In summary, drilling tested the deposit to depth, over a 300 metre strike length in the main part of the
deposit (“The Big Whopper”) with mineralization exceeding the 0.5% Li2O cutoff grade encountered in all
but one of the holes. Notable mineralized intervals (all widths estimated true width unless otherwise stated)
include 1.67% Li2O over 19.6 metres (SR-22-81), 1.20% Li2O over 27.5 metres (SR-23-83) and 1.8% Li2O
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over 9.63 metres contained within 0.96% Li2O over 45 metres (SR-23-86). For the eastern extension of
the deposit, SR-23-89 intersected 1.61% Li2O over 5.74 metres and for the western extension SR-23-92
intersected intervals of 0.89% Li2O over 12.4 metres and 1.49% Li2O over 4.5 metres. These grades are
typical of the Big Whopper resource as it also includes Rb-K feldspars which are a significant potential byproduct along with tantalum and cesium.
Drill hole SR-23-93 was set up near the geographic centre of the deposit and drilled vertically to 570
metres. As mentioned above, the objective was to explore geologically the depth extent of the Big
Whopper pegmatite assuming it continues with a vertical dip. The deepest intercept prior to this drill
program was about 315 metres from surface. The vertical drill hole intersected pegmatite to a depth of
565 metres with continuous visible petalite mineralization similar to previous assayed core intervals along
its entire length. The drill hole exited pegmatite entering amphibolite host rock at 565 metres but it is not
known whether this was due to the hole exiting the main body due to dip, or entering a narrow zone of
amphibolite which is commonly observed within the deposit. However, the drill hole has increased the
vertical depth of known petalite mineralization by 80%. Conclusions as to the grade of lithium is contingent
on the pending assay results. Please note that this intercept does not represent a true width.
All drill hole data will be brought into Avalon’s database and resource block model in order to develop an
independent updated resource estimate for the deposit.
Commenting on the recent drilling results, Avalon’s Chief Operating Officer, Rickardo Welyhorsky, says:
“The early visual result of drill hole SR-23-93 demonstrates the depth potential of the deposit and shows
the necessity of an extensive drill program to bring forward the mineralization between 315 and 565 metres
from surface into the Separation Rapids lithium resource.”
This news release was reviewed by the Dr. Bill Mercer, P. Geo. (ON). Dr. Mercer is a qualified person for
the purposes of National Instrument 43-101, who has reviewed and approved the technical information
included in this news release.