Exhibit 99.1
TSX TRUST COMPANY
VIA ELECTRONIC TRANSMISSION
May 25, 2026
TO ALL APPLICABLE EXCHANGES AND COMMISSIONS:
| RE: | COLLECTIVE MINING LTD. |
We are pleased to confirm that copies of the following proxy-related materials were mailed on May 22, 2026 to the Registered Securityholders, to the Non-Objecting Beneficial Owners ("NOBO") and to the ESPP Holders:
| 1 | Proxy with Request for Financial Statements - Registered Securityholders |
| 2 | Voting Instruction Form with Request for Financial Statements - NOBOs, ESPP Holders |
| 3 | Notice of Meeting Combined with Information Circular |
| 4 | Proxy Return Envelope |
| Yours truly, |
| TSX Trust Company |
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