Sunshine Silver Mining & Refining Co — Form 8-K

Sunshine Silver Mining reported operational readiness progress at its Idaho Sunshine Mine as of October 19, 2026, including completion of ~1,200 meters of underground development in H1 2026 (with ~1,300 meters expected in H2), acquisition of ~20 pieces of underground mining equipment, completion of 47,600 of 50,000 meters of infill drilling, installation of ~1,200 meters of new rail through September 2026, completion of a new primary production hoist at the Jewell Shaft in May 2026, and initiation of the Silver Summit Shaft upgrade project. The company is demolishing the legacy mill (started 2025, expected completion by year-end 2026) and planning a new processing facility designed initially for ~1,000 tons per day with flexibility to accommodate up to ~2,000 tons per day. Feasibility study remains targeted for Q2 2027; production return planned for late 2028.