Welcome to ClearView Geophysics
Joe Mihelcic, P.Eng., M.B.A.
Geophysicist, President & Owner
About the Owner: Mr. Mihelcic is an Applied Science '88 Geological Engineering (Geophysics Option) graduate of Queen's University at Kingston and '95 MBA graduate of Ivey Business School at the University of Western Ontario in London. He enjoys designing and implementing off-the-shelf components and technologies to make ground geophysical surveys easier and therefore more cost effective. He also writes his own software to streamline processing and interpretation.
High Resolution MaxMin EM for Gold
MaxMin by Apex is a mature method used over many decades for mineral exploration. ClearView is presently applying the method on a gold exploration project to see if it can detect subtle quadrature (out-of-phase) responses that might indicate stringer mineralization, faults or geologic formation variations.
The lowest 110 Hz frequency is used to null the inphase response for optimal intercoil separation, while the highest frequencies: 7k, 14k, 28k and 56k, are used to map the inphase and quadrature response from the subsurface. Because, in this case, bedrock is mostly near or at surface, and target mineralization is shallow, a 50-metre Rx/Tx separation was used with readings taken at 5-m intervals. At least 1 km of production per day was achieved for 5 frequencies and 5-m stations through rugged topography.
The O/P (i.e., quadrature) response for the lowest frequency used, i.e., 7040 Hz, provides information on the longest time-constant anomalies. A simple colour-shaded map and first vertical derivative of the raw quadrature response was compared to our high resolution cesium magnetics data collected on the same HLEM MaxMin survey lines so that trends could be compared to determine which MaxMin anomalies are the result of bedrock and which are most likely the result of overburden.
In wide-open areas, rather than MaxMin, ClearView uses its single-operator high resolution TDEM surveys in snowmobile-mode in tandem with a cesium magnetometer sensor for exploration in the arctic. This system is state-of-the art and provides high production rates with full-waveform data. But for thick bushy areas, MaxMin is still highly effective and customizable to specific applications.
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