The Boundary prospect area is underlain by volcanic rocks of the Upper Triassic Stuhini Group.

The Boundary area comprises two geochemical anomalies, Boundary North and Boundary South, centred on two northeast trending drainages about 250 metres east of the Central Zone. Prospecting grab samples exceeding 5 grams per tonne gold are clustered around exposed bedrock in the drainages where several trenches were completed in 1990. Soil and rock geochemistry indicate two slightly different geochemical signatures. Boundary North has a gold-silver-arsenic-zinc-antimony plus lead signature whereas Boundary South has a gold-arsenic plus silver signature. Both areas are underlain by massive, siliceous feldspar porphyry in contact to the east with Stuhini volcaniclastics. The location of the western feldspar porphyry contact is not defined on surface.

At Boundary North, multiple less than 10 centimetres wide quartz-carbonate pyrite-arsenopyrite-sphalerite veining is hosted within feldspar porphyry. Boundary North was tested in 2015 by a single drillhole; S15-065, intersecting two narrow intervals of gold mineralization of 2.0 metres grading 3.32 grams per tonne gold and 1.14 metres grading 10.5 grams per tonne gold (Assessment Report 36675). The mineralization has a gold-only signature unlike the gold-silver-arsenic-zinc signature of surface samples. S15-065 was collared quite far to the east from the surface showings drilling back to the west. With the steep westerly dips to the surface mineralization, it is possible that if the surface mineralization is continuous to depth, then the drillhole did not go far enough to intersect the veining. An historic drillhole, S91-81, is collared 65 metres south of Boundary North and drilled to the east. Hole S91-81 intersected 1.0 metres of 3.0 grams per tonne gold in a sample with a three centimetres quartz-arsenopyrite vein and 9.0 metres of 1.36 grams per tonne gold associated with increased silicification and chlorite alteration (Assessment Report 36675).

At Boundary South, centimetre scale quartz-pyrite-arsenopyrite veins, trending 350 degrees dipping 70 degrees to the west, are hosted in volcaniclastics at the east contact of feldspar porphyry. Historic trenching resulted in multiple 1.0-metre-wide samples of greater than 1.0 gram per tonne gold within both the feldspar porphyry and volcaniclastics with a maximum value of 7.11 grams per tonne gold over 1.0 metres (Assessment Report 36675). Three trenches that gave significant results were tested by a single drillhole, S90-51, which intersected strongly fractured feldspar porphyry in contact with fractured volcanic ash and crystal tuffs with fine fracture pyrite. The entire drillhole is mineralized with sub-gram gold mineralization that averaged 0.37 gram per tonne gold over 111.3 metres with only four samples greater than 1.0 gram per tonne gold (Assessment Report 36675).

Historic drillhole S91-81 mentioned above would also have tested Boundary South mineralization at the feldspar porphyry-volcaniclastics contact 60 metres north of the Boundary South trenches. This drillhole does not show wide intervals of sub-gram gold mineralization as seen at Boundary South but the narrow quartz-arsenopyrite veining is similar in character

The Road Zone is located about 140 metres east of the Central Zone, with the main showing appearing in the same gully as Boundary North just east of the old drill road. Two historical 1990 trenches (#18 and #23) appear to have sampled the Road Zone north and south of the gully, yielded sporadic high-grade values and several wider intersections in the range of 1 to 2 grams per tonne gold over several metres (as reported in (Assessment Report 36675). One 2015 drillhole, S15-047, was specifically targeted beneath several quartz-arsenopyrite veins exposed in the south wall of the gully but failed to intersect significant mineralization. The arsenopyrite veins were not seen in drill core, and the best result was 0.8 grams per tonne gold over 2.0 metres; however, on surface, 1990 and 2015 grab and trench samples were recovered that assayed over 10 grams per tonne gold (Assessment Report 36675). Additionally, soil geochemical results show a strong gold-arsenic signature that seems to originate from the area around the showing. In 2017, the showing was poorly understood and unknown if it is part of a more contiguous mineralized zone. The Road Zone seems to trend around 340 degrees to 350 degrees with a steep to westerly dip.