Lion One Drills 3.3 m of 99.13 g/t Gold from 136.4 m DH Depth, and 1.2 m of 218.31 g/t Gold from 109.0 m DH Depth at Tuvatu Gold Mine in FijiNorth Vancouver, British Columbia--(Newsfile Corp. - December 17, 2025) - Lion One Metals Limited (TSXV: LIO) (OTCQX: LOMLF) ("Lion One" or the "Company") is pleased to report significant new high-grade gold results from 4,040.90 meters of underground infill and grade control drilling at its 100% owned Tuvatu Alkaline Gold Project in Fiji ("Tuvatu").The drilling was focused on the Zone 5 part of the mine and primarily targeted the down dip extension of the UR2 lode below levels 1084 and 1066, which are the lowest levels of the current mine development. Drilling was conducted from one near surface underground drill station on the 1135 level. The Company intersected high-grade mineralization in 17 out of 22 drillholes with two drill holes abandoned. Most of the high-grade drill intersects are located within 20 m to 60 m below level 1084. Due to the proximity of these drill results to existing workings, most of these drill intercepts are anticipated to be incorporated into the mine plan in the next three to twelve months.The deepest high-grade interval (16.09 g/t gold over 1.0 m, TGC-0503) was intersected approximately 125 m below level 1084. This represents approximately 6 additional levels of mining and indicates a strong vertical continuity of the high-grade structures in this part of the deposit. The headline intercept of 99.13 g/t gold over 3.3 m includes two very high-grade sub-intervals of 459.05 g/t gold over 0.3 m and 338.00 g/t gold over 0.5 m, and is located approximately 60 m below level 1084. Previous drilling in this part of the deposit returned similar high grade results over narrow widths, such as 236.00 g/t gold over 0.4 m (see news release dated May 1, 2025).Top New Drill Results:99.13 g/t Au over 3.3 m (including 459.05 g/t Au over 0.3 m and 338.00 g/t over 0.5 m) (TGC-0454, from 136.4 m depth)218.31 g/t Au over 1.2 m (including 366.00 g/t Au over 0.6 m) (TGC-0457, from 109 m depth)24.86 g/t Au over 4.6 m (including 56.29 g/t Au over 0.5 m) (TGC-0482, from 133.92 m depth)*Drill intersects are downhole lengths, 3.0 g/t cutoff. True width not known. See Table 1 for additional data.Figure 1. Location of the Zone 5 drilling reported in this news release. Left image: Plan view of the Zone 5 drilling in relation to the mineralized lodes shown in grey, with Tuvatu underground development shown in red. Right image: Section view of the Zone 5 drilling looking West. The primary target for the Zone 5 drilling is are the down-dip extension of the Zone 5 lodes below current underground workings in the northern part of the deposit.To view an enhanced version of this graphic, please visit:https://images.newsfilecorp.com/files/2178/278302_a6a499773408c9f5_001full.jpgZone 5 DrillingThe Zone 5 area of Tuvatu is located on the east side of the deposit and includes the principal north-south and northeast-southwest oriented lodes. The drilling reported in this news release targeted the near-surface portion of the UR2 lode down-dip of current underground developments. The UR2 lode is one of the main north-south oriented lodes in Zone 5. It has a strike length of approximately 600 m and dips steeply to the east. Mine development is currently taking place along the UR2 lode both at the top of the mine, along levels 1150 and 1170, as well as at the bottom of the mine along levels 1084 and 1066/1068, which are the deepest levels in Zone 5. Level 1084 has over 300 m of development completed along strike, while Level 1066/1068 is under development.The drilling was conducted from one underground drill station, the 1135 drill station, and targeted a panel of the UR2 lode approximately 125 m in strike length and 60 m in height, with a few drillholes targeting deeper sections of the lode. 17 of the drillholes intersected high-grade intercepts, most of which were 20 m to 60 m below level 1084, including the headline intercepts of 3.3 m of 99.13 g/t gold and 1.2 m of 218.31 g/t gold. The deepest high-grade intercept returned in this drill program was 16.09 g/t gold over 1.0 m, which was intersected 125 m below level 1084. This represents an additional 6 levels of mining and indicates strong vertical continuity the high-grade material. The two most northern drillholes of the program, TGC-0493 and TGC-0495, did not intersect significant mineralization. Additional drilling is warranted in this area. The down-dip drill program returned numerous high-grade drill intersects over narrow widths, such as 459.05 g/t over 0.3 m, 366.00 g/t over 0.6 m, and 338.00 g/t over 0.5 m. These types of narrow intersects are typical at the Tuvatu deposit as the mineralized structures tend to be quite narrow. However, the structures also pinch and swell along strike and as a result there are some larger high-grade intervals that were also returned, such as 4.6 m of 24.86 g/t gold. The drillholes reported here