X0609 4 2026-06-05 0002091017 Sunshine Silver Mining & Refining Co SSMR 0002132385 Groh Douglas false 2209 BIG CREEK RD KELLOGG ID 83837 true false Common Stock 2026-06-05 4 A 0 8929 0 A 133929 D Common Stock 2026-06-05 4 P 0 10000 13.5 A 143929 D Represents shares of restricted stock units ("RSUs") granted to the reporting person. Each RSU represents a contingent right to receive one share of the Issuer's common stock. The RSUs vest in full on the earlier of (i) the first anniversary of the grant date or (ii) the day immediately proceeding the date of the Issuer's 2027 Annual Meeting of Stockholders, subject to the reporting person's continued service as a member of the Issuer's Board of Directors through such date. /s/ Michelle Shepston, as attorney-in-fact 2026-06-08