Abstract

Conductivities of a suite of rocks from the Craigment, British Columbia, ore environment were studied as functions of frequency over the four decades 1,000 to 0.1 cycles per second. A plot of linear conductivity versus log frequency shows: rocks mineralized with disseminated sulfides and magnetite yield low-to-moderate induced polarization (IP) and have concave-up conductivity-frequency spectrums; spectrums straighten as veining increases, to become sensibly straight when the metallics are largely interconnected--the IP of such rocks is low to large; massive specular hematite concentrations yield large IP and have markedly concave-up spectrums; clay-containing sandstones yield low to moderate IP and have slightly convex-up spectrums. Thus IP magnitude together with spectral analysis can distinguish the various mineralization types.

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