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Bedrock at higher elevations consists of Fairbanks quartz-mica schist with lesser light-colored quartzite (QMs on Figure 1). These rocks overlie and grade downward to chloritic and carbonaceous quartz-mica schist and black quartzite. Where mappable, the schist stratigraphy dips gently south to southeast. To the north, there is an undivided unit of calc-schist, marble, metadiorite, gneiss, and greenstone (uCbs). Contact with the Fairbanks schist is covered but assumed to be fault-bounded due to thrusting from the south. North of these rocks is a unit of magnetic biotite schist that is identified only in the northwest portion of the project area but is indicated by a higher magnetic response in the aerial magnetic survey (see references 6,7) trending northeast of Our Creek, and in the North Ridge area.

Gold, arsenic, and antimony, as anomalous values in soil and rock, and as mineralization, are spatially associated with an east-northeast-striking, 92 m.a., felsic quartz porphyry sill complex (Kd). Although formally mapped as “dikes”8, the felsic intrusive rocks are better described as a stacked swarm of gently to moderately folded quartz porphyry sills. In the North Ridge area there is evidence the sill complex is slightly folded along a northeast-oriented anticlinal axis that mimics the ridge topography. Elsewhere northwest faults have resulted in displacements, as seen on Figure 1. The sills are generally concordant with the hosting schist, although locally there is evidence of fault or shear zone contact between the two units. No contacts have been found between the sills and the lower apparently overthrust greenstone, mafic schist, and carbonate rocks, suggesting the sills pre-date the fault displacement.

Previous reverse-circulation drilling in the southern North Ridge area shows the sills to range from a few feet to a few hundred feet of true thickness. Gentle southeast and northwest structural dips creates deceivingly wide dip-slope exposures of porphyry on easterly and northwesterly sloping topography.

Porphyritic rock ranges from a gray-colored fresh, unaltered phase with minor biotite to an extensively silicified phase, bleached white, with mafic destruction, argillic alteration, and secondary sericite. Minor, but widespread, disseminated pyrite and the resulting limonite gives the porphyry a reddish color.

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