Airborne Gamma-Ray Spectrometric and Magnetic Surveys over the Bonaparte Lake Area, BC (NTS 92P, 93A)
- Warner Miles, Mike Thomas, Natural Resources Canada
Airborne gamma-ray spectrometric and magnetic geophysical surveying was completed over the Bonaparte Lake area, BC, in the eastern half of NTS 92 P in the fall of 2006. The aim of the survey was to encourage new private sector investment in resource exploration, to aid in the assessment and development of targets for mineral exploration, and to support future bedrock and surficial geological mapping.
The Bonaparte Lake area in south-central British Columbia is prospective for a number of mineral deposit types, particularly copper porphyries. However, an extensive Quaternary cover, Tertiary volcanic cover and a lack of public domain geophysical data have limited exploration in the region.
Airborne gamma-ray spectrometry provides a physical measurement which contributes to geochemical mapping of the top 30 cm of the earth's surface. The technique provides bedrock and overburden mapping assistance by fingerprinting the radioactive element signatures inherent in all rocks and soils. Where the normal signatures are disrupted by mineralizing processes, anomalies provide direct exploration vectors.
Aeromagnetic surveys provide structural and lithological information from rocks located at surface down to considerable depths. In the proposed surveys area, the technique allows determination of magnetic source depths, key to understanding lithology and mineral potential under the extensive cover sequences.
When these two techniques are integrated into a single-pass airborne survey, they provide complimentary information that serves as a long-standing geophysical/geochemical framework, supporting new geological and practical mineral exploration models for a wide variety of commodities. For example, similar surveys conducted recently in areas adjacent to the Bonaparte Lake Survey have improved geological understanding and exploration for porphyry Cu-Au, skarn, and other deposit types.
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