Drill Contract for Amitsoq

GreenRoc Strategic Materials Plc (AIM: GROC), a company focused on the development of critical mineral projects in Greenland, is pleased to announce that it has signed a drilling contract for the planned Phase III drilling programme at Amitsoq and has appointed SLR Consulting Ltd ("SLR") to undertake geotechnical and hydrogeological surveys.

Highlights

• Drill contract signed with drill contractors Mineral Exploration Drilling Ltd ("MEDL"), who have significant Greenland drilling experience.
• Phase III drilling designed to extend Indicated and Measured Resource categories and provide important data for planned Pre-Feasibility Study.
• Geotechnical and hydrogeological work to be undertaken by SLR, who have been closely involved in all previous feasibility studies commissioned by the Company in relation to both the Amitsoq mine and active anode materials ("AAM") plant.
• Drilling planned for up to 12 holes ranging ca 130m to 285m for up to ca 2,200m of drilling.

Phase III drilling programme

The Phase III drilling at Amitsoq is designed both to test the northern extension of the Amitsoq graphite ore bodies and to acquire important geotechnical and hydrogeological technical information for the upcoming Pre-Feasibility Study ("PFS"). The present Mineral Resource Estimate at Amitsoq was declared in early 2023 (see the Company's RNS of 23 January 2023) based on the Phase I and II drilling programmes completed in 2021 and 2022, respectively. The combined Measured and Indicated Mineral Resource contains a total of 7.38Mt at 21.21% graphite with an additional inferred resource of 15.67Mt at 20.04% graphite. The planned drilling aims to test a substantial part of the inferred mineral resource area to the north of the Indicated and Measured areas with the aim of lifting the category to Indicated.

The Phase III drilling programme is planned to comprise up to 12 holes, ranging from ca. 130m to 285m depth using four drill pads (Figure 1). The holes will be drilled using NQ3 (triple-tube) system which produce a slightly smaller core diameter than standard NQ2 (45.0mm versus 47.6mm, respectively), but much improved core recovery if fractured ground is encountered.

Figure 1, Amitsoq graphite deposit looking west-northwest, showing the planned four drill pads 2026-1 to 2026-4 and the planned up to 12 drill holes in light blue and the Phase I and II drill pads in dark blue. Also shown are the traces of the Lower Graphite Layer orebody (red) and Upper Graphite Layer orebody (yellow) as well as the trace of the underground historical mine workings (light yellow).

Geotechnical and hydrogeological studies

The objective of a PFS-level geotechnical study is to provide a set of stope design parameters to confirm the orebody is technically and economically viable to mine using the selected mining method and to enable the conversion of mineral resources to mineral reserves. A hydrogeological PFS study aims to provide robust hydrogeological inputs to all aspects of the mining process, ranging from the influence of water pressure on geotechnical safety to mine water management of inflows. All of the data will feed directly into the PFS, which is planned to start in late 2026. An agreement has been signed with SLR for it to conduct hydrogeological and geotechnical surveying as well as onsite training for GreenRoc crew in data acquisition procedures.

The drilling programme is planned to mobilise in mid-June 2026 with completion in August 2026 and will be overseen by the GreenRoc geological team.

Figure 2, Amitsoq looking north-west. The rusty bands are surface expressions of the graphite ore bodies. Remnants of the historical mine site can be seen near the coastline in the foreground, together with a field camp established by the Company in a previous campaign.

GreenRoc's CEO, Stefan Bernstein, commented:

"I am pleased to announce the signing of agreements with drilling contractor MEDL and engineering company SLR to carry out a Phase III drilling programme at Amitsoq. The forthcoming programme marks a significant step forward in advancing Amitsoq to development, as it is not only designed to expand and upgrade our existing mineral resources but also to gather critical geotechnical and hydrogeological data for our upcoming Pre-Feasibility Study."