Mechanochemical synthesis of tetrahedrite materials using mixtures of synthetic and ore samples collected in the Portuguese zone of the Iberian Pyrite Belt

•Direct use of tetrahedrite-tennantite ore for processing of tetrahedrite-based materials was evaluated.•The tetrahedrite-tennantite ore was collected in two different deposits located at the Iberian Pyrite Belt.•Ore and multiphase synthetic samples were mixed in different mass ratios and processed via mechanochemical synthesis.•Tetrahedrite-tennantite-(Fe) was the only sulfide phase identified in the mixtures with higher amounts of Barrigão dump ore.•Tetrahedrite-tennantite-(Fe) coexisted with famatinite-luzonite and pyrite in mixtures with Neves Corvo ore.