{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,2]],"date-time":"2026-04-02T03:33:00Z","timestamp":1775100780179,"version":"3.50.1"},"reference-count":23,"publisher":"Society of Exploration Geophysicists","issue":"6","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2006,1,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Unconformity-type deposits supply a significant amount of the world's uranium and consist of uranium that is generally codeposited with graphite in a fault zone. The low resistivity of the graphite produces a significant contrast in electrical resistivity, which can be located with electromagnetic (EM) methods. The Athabasca Basin in Western Canada hosts significant uranium deposits, and exploration in deeper parts of the basin has required the application of new EM methods. This paper presents an evaluation of the audiomagnetotelluric (AMT) exploration method at the McArthur River mine in the Athabasca Basin. AMT data were collected at 132 stations on a grid, and two-dimensional (2D) and three-dimensional (3D) inversions were used to generate resistivity models. These models showed two major results: (1) a significant conductor coincident with a major basement fault (P2) and the uranium deposits (this conductor begins at the unconformity at a depth of 550 m and extends to a depth of at least three km) and (2) a resistive halo which might be caused by the silicification associated with mineralization. However, synthetic inversions showed that this halo could be an artifact of smoothing function in the inversion scheme. The 2D inversions were validated by synthetic inversions, comparison with the 3D inversion models, and correlation with well-log information. 3D AMT forward modeling showed that strong 3D effects are not present in the AMT impedance data. Induction vectors showed more evidence of complexity, but the inclusion of these data in the inversion improved subsurface resolution.<\/jats:p>","DOI":"10.1190\/1.2348780","type":"journal-article","created":{"date-parts":[[2006,11,14]],"date-time":"2006-11-14T18:04:34Z","timestamp":1163527474000},"page":"B201-B209","source":"Crossref","is-referenced-by-count":77,"title":["Exploration for unconformity-type uranium deposits with audiomagnetotelluric data: A case study from the McArthur River mine, Saskatchewan, Canada"],"prefix":"10.1190","volume":"71","author":[{"given":"Volkan","family":"Tuncer","sequence":"first","affiliation":[{"name":"1University of Alberta, Department of Physics, Edmonton, Alberta, Canada. E-mail: vtuncer@phys.ualberta.ca; unsworth@phys.ualberta.ca."}]},{"given":"Martyn J.","family":"Unsworth","sequence":"additional","affiliation":[{"name":"1University of Alberta, Department of Physics, Edmonton, Alberta, Canada. E-mail: vtuncer@phys.ualberta.ca; unsworth@phys.ualberta.ca."}]},{"given":"Weerachai","family":"Siripunvaraporn","sequence":"additional","affiliation":[{"name":"2Mahidol University, Department of Physics, Faculty of Science, Bangkok, Thailand. E-mail: scwsp@mahidol.ac.th."}]},{"given":"James A.","family":"Craven","sequence":"additional","affiliation":[{"name":"3Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario, Canada. E-mail: craven@NRCan.gc.ca."}]}],"member":"186","published-online":{"date-parts":[[2006,10,3]]},"reference":[{"key":"2025121114152514700_R1","doi-asserted-by":"crossref","first-page":"585","DOI":"10.1046\/j.1365-246X.1998.01333.x","article-title":"On two-dimensional interpretation of magnetotelluric soundings","volume":"133","author":"Berdichevsky","year":"1998","journal-title":"Geophysical Journal International","ISSN":"https:\/\/id.crossref.org\/issn\/0956-540X","issn-type":"print"},{"key":"2025121114152514700_R2","doi-asserted-by":"crossref","first-page":"730","DOI":"10.1190\/1.1444183","article-title":"Delineating mineralization and imaging the regional structure with magnetotellurics in the region of Chibougamau (Canada)","volume":"62","author":"Chouteau","year":"1997","journal-title":"Geophysics","ISSN":"https:\/\/id.crossref.org\/issn\/0016-8033","issn-type":"print"},{"key":"2025121114152514700_R3","article-title":"First look at data from a three-dimensional audiomagnetotelluric survey at the McArthur River mining camp, northern Saskatchewan","author":"Craven","year":"2003"},{"key":"2025121114152514700_R4","first-page":"490","volume-title":"PEM case histories, Cigar and Winston Lakes, Canada","author":"Crone","year":"1991"},{"key":"2025121114152514700_R5","article-title":"Regional seismic images beneath the McArthur River ore bodies, Saskatchewan","volume-title":"Summary of investigations 2002, vol. 2","author":"Hajnal","year":"2002"},{"key":"2025121114152514700_R6","doi-asserted-by":"crossref","first-page":"610","DOI":"10.1046\/j.0956-540x.2001.01560.x","article-title":"Effects of anisotropy on the two-dimensional inversion procedure","volume":"147","author":"Heise","year":"2001","journal-title":"Geophysical Journal International","ISSN":"https:\/\/id.crossref.org\/issn\/0956-540X","issn-type":"print"},{"key":"2025121114152514700_R7","article-title":"EXTECH IV","volume-title":"Athabasca uranium multidisciplinary study of northern Saskatchewan and Alberta, Part 1, Overview and impact: Geological Survey of Canada Current Research","author":"Jefferson","year":"2003"},{"key":"2025121114152514700_R8","doi-asserted-by":"crossref","first-page":"70","DOI":"10.1190\/1.1543195","article-title":"Case history. 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