{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,1]],"date-time":"2026-05-01T03:31:05Z","timestamp":1777606265921,"version":"3.51.4"},"reference-count":13,"publisher":"Society of Exploration Geophysicists","issue":"2","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2010,1,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Exploration for volcanogenic massive sulfides requires good geologic understanding. Geologic knowledge often is limited by a lack of outcrops. This is especially true in Canada under residual glacial covers. Geologic information must therefore be complemented by information obtained using means such as geophysical and geochemical observations. Electromagnetic (EM) methods extend lithological understanding to depths beyond the overburden. Massive sulfides are highly conductive and, depending on their depth and volume, may be detected easily by airborne EM surveys. They are more often equant than graphitic sediments, which typically have longer strike length. Current EMtechniques that identify massive sulfides operate in the frequency or time domain, the latter being more common. Additional information can be provided by using power-line fields as a source of EM signals when the powerlines are appropriately located in the area of interest. We have worked in an active exploration area near Chibougamau, Canada, known for a large occurrence of massive sulfide deposits. The geology is a sequence of volcanic formations with felsic and mafic intrusions. Our magnetic technique responded well to mafic rocks. An airborne time-domain EM survey mapped localized and intrasedimentary conductors in that area. We learned in our study that power-line EM fields can be used to map large-extent conductive formations and narrow geologic faults.<\/jats:p>","DOI":"10.1190\/1.3343573","type":"journal-article","created":{"date-parts":[[2010,3,23]],"date-time":"2010-03-23T18:04:03Z","timestamp":1269367443000},"page":"B67-B72","source":"Crossref","is-referenced-by-count":17,"title":["Case history of combined airborne time-domain electromagnetics and power-line field survey in Chibougamau, Canada"],"prefix":"10.1190","volume":"75","author":[{"given":"Marc A.","family":"Vall\u00e9e","sequence":"first","affiliation":[{"name":"1Fugro Airborne Surveys, Ottawa, Canada. E-mail: mvallee@fugroairborne.com."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Richard S.","family":"Smith","sequence":"additional","affiliation":[{"name":"2Formerly Fugro Airborne Surveys, Ottawa, Canada. Presently Laurentian University, Sudbury, Canada. E-mail: rssmith@laurentian.ca."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Pierre","family":"Keating","sequence":"additional","affiliation":[{"name":"3Geological Survey of Canada, Ottawa, Canada. E-mail: pkeating@nrcan.gc.ca."}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"186","published-online":{"date-parts":[[2010,3,23]]},"reference":[{"key":"2025121115212291000_R1","article-title":"Stratigraphy and metallogeny in the Chibougamau area","author":"Allard","year":"1979"},{"key":"2025121115212291000_R2","doi-asserted-by":"crossref","first-page":"593","DOI":"10.4095\/106067","article-title":"Geophysics and geochemistry in the search for metallic ores","volume-title":"Exploration discoveries, Noranda district, Quebec (Case history of a mining camp)","author":"Boldy","year":"1979"},{"key":"2025121115212291000_R3","first-page":"96","article-title":"G\u00e9ologie et \u00e9volution m\u00e9tallog\u00e9nique de la r\u00e9gion de Chibougamau","volume-title":"Environnement g\u00e9ologique de l'extr\u00e9mit\u00e9 orientale de la sous-province de l'Abitibi","author":"Chown","year":"1996"},{"key":"2025121115212291000_R4","first-page":"713","article-title":"The VMS model: Advances and application to exploration targeting","volume-title":"5th Decennial International Conference on Mineral Exploration, Proceedings","author":"Gibson","year":"2007"},{"key":"2025121115212291000_R5","first-page":"83","article-title":"Carte lithostatigraphique de la r\u00e9gion de Chibougamau","author":"Gobeil","year":"1983"},{"key":"2025121115212291000_R6","doi-asserted-by":"crossref","first-page":"70","DOI":"10.4095\/103465","article-title":"Symposium on basins and geosynclines of the Canadian Shield","volume-title":"The Abitibi orogenic belt","author":"Goodwin","year":"1970"},{"key":"2025121115212291000_R7","first-page":"863","article-title":"A comparison between old and recent airborne time-domain electromagnetic surveys flown in the Chibougamau region, eastern Canada","volume-title":"5th Decennial International Conference on Mineral Exploration, Proceedings","author":"Keating","year":"2007"},{"key":"2025121115212291000_R8","first-page":"138","article-title":"Airborne resistivity mapping using powerline sources","volume-title":"59th Annual International Meeting","author":"Labson","year":"1989"},{"key":"2025121115212291000_R9","article-title":"Towards new discoveries thanks to the application of 3D modeling in the Noranda Camp","author":"Martin","year":"2005"},{"key":"2025121115212291000_R10","first-page":"811","article-title":"Electromagnetic methods in applied geophysics: Application","volume-title":"Airborne electromagnetic methods","author":"Palacky","year":"1991"},{"key":"2025121115212291000_R11","doi-asserted-by":"crossref","first-page":"365","DOI":"10.1016\/0031-9201(73)90061-7","article-title":"Regional induction studies: A review of methods and results","volume":"7","author":"Schmucker","year":"1973","journal-title":"Earth Planetary International"},{"key":"2025121115212291000_R12","doi-asserted-by":"crossref","first-page":"1124","DOI":"10.1190\/1.1444805","article-title":"The realizable resistive limit: A new concept for mapping geological features spanning a broad range of conductances","volume":"65","author":"Smith","year":"2000","journal-title":"Geophysics"},{"key":"2025121115212291000_R13","first-page":"73","article-title":"The MEGATEM fixed-wing transient EM system applied to mineral exploration: A discovery case history: First Break","volume":"21","author":"Smith","year":"2003"}],"container-title":["Geophysics"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/pubs.geoscienceworld.org\/seg\/geophysics\/article-pdf\/75\/2\/B67\/3217144\/gsgpy_75_2_B67.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"syndication"},{"URL":"https:\/\/pubs.geoscienceworld.org\/seg\/geophysics\/article-pdf\/75\/2\/B67\/3217144\/gsgpy_75_2_B67.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,12,11]],"date-time":"2025-12-11T20:21:29Z","timestamp":1765484489000},"score":1,"resource":{"primary":{"URL":"https:\/\/pubs.geoscienceworld.org\/geophysics\/article\/75\/2\/B67\/308309\/Case-history-of-combined-airborne-time-domain"},"secondary":[{"URL":"http:\/\/geophysics.geoscienceworld.org\/cgi\/doi\/10.1190\/1.3343573","label":"geoscienceworld"}]},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2010,1,1]]},"references-count":13,"journal-issue":{"issue":"2","published-print":{"date-parts":[[2010,1,1]]}},"URL":"https:\/\/doi.org\/10.1190\/1.3343573","relation":{},"ISSN":["1942-2156","0016-8033"],"issn-type":[{"value":"1942-2156","type":"electronic"},{"value":"0016-8033","type":"print"}],"subject":[],"published-other":{"date-parts":[[2010]]},"published":{"date-parts":[[2010,1,1]]}}}