J2 Metals Samples up to 1,030 g/t Silver at Sierra Plata; Identifies Seven Veins and Advances Toward Trenching and Drilling

J2 Metals Inc. (TSXV: JTWO) (OTCQB: JTWOF) (FSE: OO10) (" J2 " or the " Company ") is pleased to provide an update on exploration at its Sierra Plata silver-gold-antimony project (" Sierra Plata " or the " Project "), located in the Taxco district of Guerrero State, Mexico. Since field work began in late May 2026, the Company's crews have completed systematic geological mapping, prospecting and rock sampling across approximately half of the Project area, identifying seven veins, locating 20 historical mine workings, and returning multiple high-grade silver assays that will guide a first-ever trenching program. Highlights Best results from the 186 mapping rock samples collected to date include 1,030 g/t Ag (dump sample, El Sabino), 941 g/t Ag over 0.7 m with 1.9% Pb and 4.3% Zn (channel sample on the El Sabino vein trend), 811 g/t Ag over 1.4 m (channel, El Sabino) and 788 g/t Ag with 1.05 g/t Au (channel, El Salto). Seven veins identified to date, including the San Miguel vein; sampling has highlighted the El Salto and El Sabino veins as new priority areas for follow-up. Approximately 50% of the Sierra Plata project area now mapped for geology, alteration and structure; silver mineralization is preferentially developed where veins are hosted in tuff and limestone. 20 historical mine workings located to date, including the El Sabino mine with more than 30 m of underground development on two levels. Trenching program being designed across the El Sabino, San Miguel, El Salto and El Resumidero veins, with trenches planned every 25 to 30 metres along strike; drill permitting is advancing in parallel. Drill permitting is in process to be able to test key targets in a maiden diamond drill program. "The first two months of systematic work at Sierra Plata have exceeded our expectations," said Thomas Lamb, CEO of J2 . "We are seeing high silver grades not only at the historical mines that first attracted us to the district, but also on newly recognized structures such as the El Salto and El Sabino veins. With half the property still to be mapped, seven veins already defined and 20 historical workings located, we are moving quickly to trench top targets and to secure the permit for a first drill program. The work carried out to date by our technical team led by Carlos Cham in Mexico has been excellent and we are very excited by the results and discoveries being made." Rock Sampling Program A total of 186 rock samples (channel, chip, dump and float samples) have been collected from veins, mineralized structures and historical workings across the Project, with assay results received for all samples. Selected best results are summarized in Table 1. Table 1: Selected best silver results from mapping activities to date Sample Type Width (m) Ag (g/t) Au (g/t) Sb (%) Old working / structure 798548 Dump — 1,030 0.15 0.27 El Sabino mine area 798670 Channel 0.7 941 0.04 0.03 Outcrop along the El Sabino vein trend 798514 Channel 1.4 811 0.14 0.05 El Sabino mine 798563 Channel 0.25 788 1.05 0.02 El Salto mine 798564 Channel 0.15 643 1.13 0.02 El Salto mine (second-level heading) 798594 Channel 0.7 583 0.10 0.06 El Resumidero 798695 Chip 0.8 427 0.08 0.12 Cedro Rojo prospect 798568 Channel 0.1 296 3.34 0.02 El Salto mine   Channel and chip sample widths are as recorded in the field and may not represent true widths. Dump and float samples are selective by nature; all reported samples are selective in nature and are not necessarily representative of the mineralization hosted on the Project. In addition to silver, several of the best samples carry significant base-metal and antimony values, including 4.3% zinc and 1.9% lead in sample 798670, 2.1% zinc in sample 798548 (with 0.27% antimony), and gold values of up to 3.34 g/t (sample 798568, El Salto). Geological Mapping Slightly more than 50% of the Project area has now been mapped, outlining four principal rock types: limeston...