TDG Gold Corp. announced preliminary metallurgical results from two composite samples constructed from diamond drillholes SH21-004 and SH21-005 from the 2021 drilling program at its former producing gold-silver Shasta mine, Toodoggone District, B.C. The samples tested responded very well to gold ("Au") and silver ("Ag") recoveries by conventional flotation, direct cyanidation and a combination of flotation and cyanidation treatments, which is similar to the historical processing flowsheet used at the Baker mill. Some of the gold occurs as coarse nugget grains which are amenable to gravity concentration.

Direct cyanidation achieved extraction percentages of 84.7% to 96.4% for Au, and 69.1% to 80.5% for Ag. Flotation testing delivered recoveries to concentrate of 94.3% and 98.0% for Au, and 88.4% and 96.0% for Ag. Flotation concentrate regrinding and cyanidation delivered recoveries of 87.7% to 94.8% for Au, and 64.8% to 77.2% for Ag.

Ore from the Shasta deposit was intermittently processed at Baker mill between 1989-1991 and 2008-2012 before the mill was put under care and maintenance. The Baker mill was originally designed to process the mill feeds from the Baker mine at a mill feed rate of 100 short tons per day (st/d). The mill consisted of two stages of crushing and one stage of ball mill grinding.

The Au and Ag recovery processing flowsheet used at the early stage of the operation was a whole-ore cyanide leaching followed by Merrill Crowe treatment to recover Au and Ag from the leaching solution. Due to changes in mineralogical property in the late operation, the processing flowsheet was modified by incorporating a flotation pre- concentration circuit to recover gold and gold-bearing minerals into a flotation concentrate, which was further treated by cyanide leaching and Merrill Crowe process to recover Au and Ag from the concentrate. The flotation tailings bypassed the cyanide leaching circuit and was disposed, together with the leach residue, to the tailings storage facility ("TSF").

The mill feed rate was increased to approximately 200 tonnes per day (t/d). 2021-2022 Metallurgical Test Work Flotation The flotation test results indicate that the two samples responded well to the flotation procedure at a coarse primary grind size of 80% passing approximately 200 µm. The gold recovery reporting to rougher flotation concentrates ranged from 97.2% to 99.0% for Sample #2 and 93.3% to 97.2% for Sample #1 at different primary grind sizes, ranging from approximately 80% passing (P80) 72 µm to 209 µm. The average silver recoveries to the rougher flotation concentrates were 90.3% for Sample #1 and 96.4% for Sample #2. The cyanide leach test results show both Sample #1 and Sample #2 responded well to the direct cyanidation. The average gold extraction rates were 87.3% for Sample #1 and 95.0% for Sample #2. On average the silver extraction rates were 72.5% for Sample #1 and 76.9% for Sample #2. The test results also indicate that the cyanide leaching kinetics were relatively rapid, approximately more than 70% and 50% of the Au were respectively extracted from Sample #1 and Sample #2 within a leaching retention time of 7 hours.

A total leach retention time is 48 hours. In general, the reground flotation concentrate responded well to the cyanidation. In the tested regrind size range, the gold and silver extractions were not sensitive to the regrind size.

On average, Au and Ag extractions were approximately 93.6% Au and 73.5% Ag for the Sample #1's concentrate and 96.3% Au and 79.2% Ag for the Sample #2's concentrate. Overall, Au and Ag recoveries (flotation + cyanidation) are calculated to be 88.3% Au and 65.0% Ag for Sample #1 and 94.4% Au and 76.1% Ag for Sample #2, respectively. The test results show that reagent consumptions, including sodium cyanide, are at the reasonable levels.