Infrared spectra with metal concentrations and geochemical data for scheelite-derived Technosols (Brejuí Mine, Northeastern Brazil)

This dataset contains near-infrared (NIR) and mid-infrared (MIR) spectral data alongside total concentrations of Cd, Co, Cr, Cu, Ni, Pb, Sn, Sr, Ti, V, and Zn, major oxide compositions, and pH measurements from 120 surface soil samples (0-30 cm) collected across three Technosol sites with 2 (s2), 10 (s10), and 40 (s40) years of scheelite mining tailings accumulation at the Brejuí Mine, Currais Novos, Rio Grande do Norte, Brazil. Metal concentrations were determined by ICP-OES following open-vessel acid digestion, and spectra were acquired by FTIR in diffuse reflectance mode at 2 cm⁻¹ resolution.