X0607 3 2026-06-03 0 0002091017 Sunshine Silver Mining & Refining Co SSMR 0001683699 SHEPSTON MICHELLE H false 2209 BIG CREEK RD KELLOGG ID 83837 true General Counsel Stock Option (Right to Buy) 4 2035-12-15 Common Stock 650000 D These stock options were granted on December 15, 2025 and vest in three equal installments on each of November 11, 2026, 2027 and 2028, subject to the reporting person's continuous service. Exhibit 24 - Power of Attorney. /s/ Michelle Shepston, as attorney-in-fact 2026-06-03