This repository contains the results of passive imaging component of the comprehensive COGITO-MIN research project aiming for development of an efficient integrated exploration workflow ranging from regional-scale exploration to detailed resource delineation and mine planning. Passive seismic experiment was performed in the Kylylahti polymetallic (Cu-Co-Zn-Ni-Ag-Au) mine area between early August to late September 2016 as a part of the COGITO-MIN (COst-effective Geophysical Imaging Techniques for supporting Ongoing MINeral exploration in Europe) project. We used 994 receiver stations distributed regularly over the 3.5 x 3 km area with 200 m line spacing and 50 m receiver interval. Surface conditions varied between exposed bedrock to swamps. Each receiver station consists of the Geospace GSR recorder and 6 x 10-Hz geophones bunched together and buried whenever possible, recording at a 2 ms sample rate for 20 hrs/day for 30 days. As a result, we recorded over 600 hours of ambient noise data per each receiver. In addition, the 3D grid recorded irregularly distributed active shots (both explosives and Vibroseis) specifically designed for the 3D active-source survey as well as those from the 2D seismic profiles crossing the 3D grid. Therefore, a low-fold 3D active-source seismic survey was also acquired to benchmark the results of the passive survey. Data in this repository consists of two sets of virtual-source gathers (VSGs) constructed using selective stacking approach and using all-data approach, and the results of conventional reflection processing applied to these two sets of VSGs. These data sets have been explained in more detail in the data folder.

2021