Star Diamond Corporation provided a review of the work completed by Rio Tinto Exploration Canada Inc. ("RTEC") on the Fort a la Corne Project ("FalC Project"). From June 2017 until June 2022, RTEC pursued extensive exploration and evaluation analysis on two fronts at the FalC Project: The successful completion and calibration of a trench cutter bulk sampling and macrod diamond recovery program on Star Kimberlite, with a view to expand this program to the Orion South Kimberlite; and A separate team of RTEC geologists conducted the Orbit exploration program, with the aim of prioritizing the diamond prospectivity of all the other kimberlites that make up the FalC Project. RTEC also conducted detailed mining studies for the future development of diamond mines on the Star, Orion South and Orion North Kimberlites.

Many of the conclusions of these mining studies confirm work previously completed by Star Diamond. Highlights of RTEC's studies suggest: The continuous and sequential mining of diamonds from Orion South, Star and Orion North over a period of seventy years; The ability to maintain stable pit slopes in the Fort a la Corne Kimberlites through the use of wall buttressing and dewatering; Analysis produced by RTEC estimates that, based on the currently available size frequency distribution ("SFD") for the EJF kimberlite, a 222,000 tonne sample of the EJF is likely to yield 101 Specials (+10.8 carats) and one Exceptional diamond (+100 carats); and. Star Trench Cutter Bulk Sampling and Diamond Recovery.

RTEC contracted Bauer Maschinen GmbH ("Bauer") to adapt a Bauer BC 50 Cutter to sample kimberlite at depths of up to 250 meters below surface. The trench cutter ("TC") has a rectangular profile of 3.250 metres by 1.575 metres (3.200 by 1.525 metres drill tool plus 25 millimetres all round overbreak). The trenches were excavated using the custom Bauer BC 50 Cutter mounted on a Bauer MC 128 Duty-cycle Crane.berlite excavated by the cutter bit was pumped to the surface in a slurry, and kimberlite fragments between +1.0 and 80.0mm were recovered from the slurry by the Kimberlite Separation Unit.

Careful analysis produced by RTEC estimates that the currently available SFD for the EJF kIMberlite within the Star Kimberlite, a 222,000 tonsne sample of the EJ F is likely to yield 101 Special's (+10.8 carats") and one Exceptional diamond (+ 100 carats). remember that the PEA anticipates an ore processing rate of 45,000 tonnes of kimberlite per day and, consequently, Specials should be recovered on a daily basis and Exceptional diamonds on a weekly basis. Orbit Exploration Program FalC Project.

The results of the Orbit exploration program highlighted the kimberlites of Orion North (K120, K147, K148) as having significant potential to add to the future Mineral Resources of the FalC Project. See recent Orion North diamond valuation and Type IIa proportion News Release May 16, 2024. Orion Centre (K145), Taurus (K150, K118, K122) and K119 stand out in the field as having a number of the attributes sought but require further work to completely evaluate.

The methodology and conclusions of this work have already been published as News Release April 13, 2022. Mining Studies Completed by RTEC. RTEC developed a conceptual 74 year schedule for the sequential mining of Orion South, Star and OrionNorth, assuming that the run-of-mine ore capacity was limited to 14 million tonnes per annum, and they anticipated 70 continuous years of kimberlite ore processing and diamond production.

Star Diamond believes this work is not necessarily compliant with NI 43-101. Mining studies provided to Star Diamond by RTEC demonstrated the ability to maintain stable pit slopes In the Fort a la Corneberlites.