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We present an overview and preliminary results of an extensive seismic survey conducted in 2024 on historical mine tailings at the Blötberget mining site in central Sweden. The data were acquired using a combined, partly collocated setup comprising a sparse 3D nodal array, a landstreamer-mounted MEMS array, and distributed acoustic sensing (DAS) using a shallowly buried 2100 m long fiber optic cable. The data are used for characterizing the mine tailings, to compare different collocated seismic recording instruments and for develop new imaging solutions.