Understanding Archean greenstone-hosted lode gold mineralization in Ontario Canada through helicopter TDEM data

SummaryWe have analysed s large public-domain TDEM datasets acquired by Ministry of Northern Development and Mines – MNDM of Ontario Canada. Geophysical data set 1076 (6,500 out of the original 10,000 line-kms not affected by powerlines) located in an area east of Nestor Falls Ontario in the Western Wabigoon Terrane (WWT) for the purpose of understanding the potential deposition sites of possible gold mineralization. There are a large number of known mineral occurrences (mostly gold) in the Nestor Falls survey area. By analysing these two datasets, we try to determine the electromagnetic, magnetic and airborne inductively induced polarization (AIIP) signatures directly or indirectly related to the gold showings.The results of the investigation indicate that some of the Archean lode gold showings are located at some distance away from the strongest conductors and others don’t have any conductive signatures at all. The magnetic association is complex and the gold mineralization could be with or without magnetic signatures. Many Canadian Archean lode gold occur in resistive glaciated terrains, and sometimes show weak AIIP responses that can be seen in the Logrestau and Restau products. We believe that the EM, magnetic and the AIIP Logrestau or Restau signatures, if detected and interpreted properly, could potentially be used as proxies in the search for Archean greenstone-hosted lode disseminated gold mineralization in Ontario, and perhaps in other Archean terranes.