Helicopter AFMAG (ZTEM) EM and magnetic results over sedimentary exhalative (SEDEX) lead-zinc deposits at Howard’s Pass in Selwyn Basin, Yukon

Jean M. Legault; Ali Latrous; Shengkai Zhao; Nasreddine Bournas; Geoffrey Plastow; J.J. O’Donnell

doi:10.1071/ASEG2015ab192

24th International Geophysical Conference and Exhibition – Geophysics and Geology Together for Discovery

ISSN: 2202-0586
E-ISSN:

oa Helicopter AFMAG (ZTEM) EM and magnetic results over sedimentary exhalative (SEDEX) lead-zinc deposits at Howard’s Pass in Selwyn Basin, Yukon
Authors Jean M. Legault^a, Ali Latrous^b, Shengkai Zhao^c, Nasreddine Bournas^d, Geoffrey Plastow^e and J.J. O’Donnell^f
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^a Geotech Ltd, 245 Industrial Parkway N. Aurora, , Canada, L4G 4C4, [email protected] ^b Geotech Ltd., 245 Industrial Parkway N. Aurora, , Canada, L4G 4C4, [email protected] ^c Geotech Ltd, 245 Industrial Parkway N. Aurora, , Canada, L4G 4C4, [email protected] ^d Geotech Ltd, 245 Industrial Parkway N. Aurora, , Canada, L4G 4C4, [email protected] ^e Geotech Ltd, 245 Industrial Parkway N. Aurora, , Canada, L4G 4C4, [email protected] ^f Selwyn Chihong Mining Ltd., 1055 West Georgia Street, Suite 2701 Vancouver, , Canada, V6E 0B6, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2015, Issue 24th International Geophysical Conference and Exhibition – Geophysics and Geology Together for Discovery, Dec 2015, p. 1 - 5
DOI: https://doi.org/10.1071/ASEG2015ab192
- Published online: 01 Dec 2015

Abstract

In 2008 Geotech flew a regional scale 24,675 line-km survey covering a 25,000 km² area (1 km line spacing) in the Selwyn Basin. The survey footprint straddles east-central Yukon and overlaps into the western Northwest Territories. In March 2013 Yukon Geological Survey purchased the survey data, and in November 2013, released the data publicly. The Selwyn Basin area is prospective for SEDEX-style Pb-Zn-Ag mineralization and the ZTEM survey data provide insights into regional structures and plutons in the region. The Howard’s Pass SEDEX deposits at the southeastern edge of the Selwyn Basin survey area host a combined ~250 million tonne resource with ~4.5% Zn and ~1.5% Pb.

Major NW-SE to ESE and minor NNW-SSE linear conductive trends correlate with known regional geologic, structural and inferred mineral trends. Circular conductive anomalies surrounding resistivity highs reflect po-rich hornfels surrounding intrusive plutons. 2D-3D computer inversions reveal a correlation between enhanced conductivity along strike and the clustering of deposits at Howard’s Pass.

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References

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Carne, R., Phillips, R., and Lane, J., 2013, An explorer’s take on the Selwyn Basin ZTEM survey: Presented at Yukon airborne geophysics workshop, Yukon Geoscience Forum 2013, Yukon Chamber of Mines and Yukon Geological Survey, Whitehorse, Canada.
Goodfellow, W.D., 2007, Base metal metallogeny of the Selwyn Basin, Canada, in Goodfellow, W.D., ed., Mineral Deposits of Canada: A Synthesis of Major Deposit-Types, District Metallogeny, the Evolution of Geological Provinces, and Exploration Methods: Geological Association of Canada, Mineral Deposits Division, Special Publication 5, 553-579.
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Article Type: Research Article

Keyword(s): 2D-3D inversion; Airborne; electromagnetics; magnetics; SEDEX; Selwyn Basin; ZTEM

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oa Helicopter AFMAG (ZTEM) EM and magnetic results over sedimentary exhalative (SEDEX) lead-zinc deposits at Howard’s Pass in Selwyn Basin, Yukon

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