X0607 3 2026-06-03 0 0002091017 Sunshine Silver Mining & Refining Co SSMR 0002132663 White Heather Eileen false 2209 BIG CREEK RD KELLOGG ID 83837 true true Chief Executive Officer Common Stock 50000 I By White Mining Consulting Inc. Stock Option (Right to Buy) 4 2035-07-15 Common Stock 1463000 D Warrants 5 2027-09-30 Common Stock 25000 I By White Mining Consulting Inc. The reporting person is the President of White Mining Consulting Inc. and may be deemed to beneficially own securities held by White Mining Consulting Inc. These stock options were granted on July 15, 2025 and vest in three equal annual installments on the first three anniversaries of the grant date, subject to the reporting person's continuous service. Each warrant is exercisable for one share of common stock until the later of two years from the date of purchase or six months after the completion of the Issuer's initial public offering. Exhibit 24 - Power of Attorney. /s/ Michelle Shepston, as attorney-in-fact 2026-06-03