Replacement - Tender Update

This announcement replaces the announcement with ID number: 301316185 released on 1 December 2025 at 7:40 a.m. with the headline "Tender Update". The following sentence "Leaving the remainder of the original 135,139.47 carat parcels, less approximately 2% boiling loss, of untendered stones, Gem quality" replaces "Leaving a remaining parcel of gem-quality stones totalling approximately 135,139.47 carats, less an estimated 2% boiling loss, which were not included in the tender". All other details of the announcement remain unchanged.

Vast Resources plc

("Vast" or the "Company")

Tender Update

Vast Resources plc, the AIM quoted mining company, wishes to provide the following further information in relation to the diamond tender process announced on 25 November 2025.

The 123,711.8 carats of lower value gem and industrial stones sold at an average price of US$6.87 per carat included:

• 50,993.98 carats of industrial stones;
• 63,091.75 carats of rejection low stones
• 8,211.71 carats of rejection high stones.
• 695.5 carats of cleavage stones; and
• 718.88 carats of low quality gem stones;

Leaving the remainder of the original 135,139.47 carat parcels, less approximately 2% boiling loss, of untendered stones, Gem quality.

It is noted that whilst the "cleavage" and "rejection high" category stones were included within the 12,591.77 "mixed / higher quality" gems announced on 17 November 2025, these categories are inherently of lower value than high grade gems, as indicated by the difference in average sale price as compared with the 'high grade' stones which sold at an average price of US$1,083 per carat and it is also noted that the stone categories as set out in the Company's announcement of 18 November 2025 are determined by the auction house through which the tender was conducted and not by the Company.

The Company also takes this opportunity to state that references to the quality of stones and are indicative only. The sole material metric by which Vast sets any store is the sales value as stones are disposed of.

The Board was encouraged by this initial tender process which paves the way for future such tenders and demonstrates the Company's ability to market the diamonds, and in particular, its high value stones, going forward.

The Company will provide further updates to the market as and when appropriate.

For further information, please visit the Company's website at www.vastplc.com or contact: