Tertiary Minerals plc announced that laboratory check analytical results on soil samples from the Jacks Copper Project in Zambia have confirmed and enhanced the provisional results previously reported based on portable XRF analyses taken in the field. Key Points: Laboratory check multielement analytical results now received for 107 soil samples from 4 sample grids. Laboratory results show excellent correlation with previously reported field pXRF results.

New scandium analyses (not available with pXRF analysis) allows evaluation of key copper:scandium ratios. High Cu:Sc ratios are considered indicative of hydrothermal copper sulphide mineralisation elsewhere in Zambia. The high Cu:Sc ratios obtained from the soil samples taken over copper sulphide mineralisation intersected in Company's 2022 drill programme at Area D validate the application of the Cu:Sc ratio and both enhance and extend the Area D soil anomaly beyond the area drilled.

Laboratory analyses for 27 contiguous soil samples along a check profile in Area C exhibit high Cu:Sc ratios for a strike length of approximately 1 km and make Area C another priority for drill testing.