Silicon Announces The Ptarmigan Project Preliminary 3D Modelling Results

Vancouver, British Columbia--(Newsfile Corp. - October 3, 2025) - SILICON METALS CORP. (CSE: SI) (FSE: X6U) ("Silicon Metals" or the "Company") is pleased to announce that processing of the LiDAR data collected in the summer 2025 has resulted in the preliminary volumetric estimate of approximately five million cubic metres (5,000,000 m³) of surface quartzite material at the Ptarmigan Project. As disclosed in the Company's June 4, 2025, news release, samples of quartzite material collected from these ridges tested up to 99.99% SiO₂ purity, with an average purity of the collected samples of 98.49% SiO₂.

As shown in the below image, the Ptarmigan Project contains a number of topographic high ridges which are indicated to be composed of quartzite material based on LiDAR surveying, ground mapping, and 3D modelling. In August 2025, the Ptarmigan quartzite ridges were traversed and ground truthing was completed by geologists. The geological contacts and structures were mapped, and the field data collected was utilized in the 3D model. The 3D model was constructed with the powerful engineering CAD software Civil3D by Autodesk. This is an industry standard design software that specializes in calculating the volume of topographic features, stockpiles, cut and fills, excavation, and other such engineering and scientific applications. Using the digital elevation model topography from the LiDAR and the mapped geological contacts, quartzite zones were established. As the quartzite zones consist of topographically high ridges, preliminary volume estimates were calculated by cutting the ridges down to match the surrounding topography.

The results of the 3D modelling yielded the volumetric estimate of approximately five million cubic metres (5,000,000m³) of quartzite material present in the topographic high ridges. The density of the Ptarmigan quartzite is approximately 2.6 t/m³ (tonnes per cubic metre) as determined by in house laboratory analysis. Rock density was calculated through water volume displacement. Six (6) representative samples were initially weighed to obtain their dry mass. Samples were then placed in a container with a known water level. The subsequent displacement of water was then measured to determine the volume of each sample. The rock density of each sample was then calculated using the dry mass and volume values and an average density of the six samples was calculated. The typical density of quartzite ranges from 2.5 to 2.8 t/m³.¹ This volumetric estimate represents quartzite material that is at surface above grade in the form of topographic high ridges and does not consider any material not visible at surface. The potential quantity and grade of this exploration target are conceptual in nature. There has been insufficient exploration to define a mineral resource, and it is uncertain if further exploration will result in the target being delineated as a mineral resource. The estimate disclosed in this news release is based on surface LiDAR data and limited geological mapping and modelling and does not constitute a mineral resource or mineral reserve estimate as defined by NI 43-101 and the CIM Definition Standards.