The Boundary Falls occurrence is 5.5 kilometres south of Greenwood and immediately south of the May Mac claims
The following is taken from the BC Minfile report for the Boundary Falls 082ESE171.
“Mineralization in quartz veins appears to be associated with Tertiary diorite intrusives and is hosted in the intrusion and the country rock. Mineralization consists of pyrite, galena, tetrahedrite, sphalerite and chalcopyrite in a gangue of mainly quartz and occasional calcite; it also occurs in local silicified zones. Gold and silver values are associated with the sulphide mineralization.
A quartz vein system labelled the Glory Hole strikes northwest and dips 75 degrees southwest and appears to be hosted in a shear zone in Permo-Carboniferous Knob Hill Group mica schist close to the contact with a Tertiary diorite-monzodiorite intrusion. The vein is highly shattered and ranges from a few centimetres to 1.5 metres in width. Some stringer veins disperse into the wallrock. Limonite occurs as an oxidation product along fracture planes within the quartz vein. The vein is offset along strike by subparallel fault movements and contains locally semimassive pyrite with lesser galena and sphalerite.
In May 1975, Amigo Silver Mines Ltd. conducted a very low-frequency electromagnetic survey on the Boundary Falls claim group, outlining a northwest-trending, steeply south-dipping conductive
zone (Assessment Report 5618).
Between October and November 1975, Amigo completed a 2093-line metre self-potential geophysical survey over the electromagnetic anomaly outline earlier in the year and five diamond drill holes totalling 336.5 metres. Two holes testing beneath the Glory Hole vein lacked encouraging results; the remaining three holes intersected barren quartz veins with enough pyrite and graphite present to account for the electromagnetic anomalies (Assessment Report 6067).
In 1978, rock samples from the Glory Hole zone (Boundary Falls Property) returned values to 14.1 g/t Au (0.41 oz/t) and 31.9 g/t Ag (0.93 oz/t) over 1.2 m (4ft.) (Tully, 1978).
In 2002, InvestNet Inc. conducted limited prospecting activities, recovering high-grade gold samples from the No. 1 Vein and Glory Hole areas. Near the Glory Hole, a grab sample of semimassive pyrite with lesser galena and sphalerite assayed 69 grams per tonne gold, 2335 parts per million lead, 8341 parts per million lead and 100.6 grams per tonne silver with anomalous molybdenum, cobalt, arsenic, cadmium, bismuth and mercury.
In 2005, 730821 Ltd. conducted approximately 120 line kilometres of helicopter-borne time domain electromagnetic and magnetometer surveys. A prospective anomaly was identified coincident with a postulated north-plunging limestone anticline hinge (Assessment Report 28307).”
The Glory Hole Showing
The Glory Hole showing was examined in 2015 and found to consist of more than one quartz vein zones. The historic underground development consists of a portal and adit to crosscut the main zone, which was drifted on to the west and then raised on (total 25m). The main zone consists of a quartz vein zone up to 0.6 metres wide bounded by a fault on the hangingwall and an adjacent quartz stringer zone on the footwall side that is 0.7 metres thick. The veins are composed of massive coarse-grained white quartz containing local clots of disseminated pyrite, with limonitic box-work texture developed where pyrite has weathered away.
Channel samples collected in 2015 are listed below. The samples were collected in the drift and the results indicate significant gold in the main vein at the Glory Hole.
Skarn type mineralization occurs in marble at the portal on the western side of the Glory Hole vein. The host rocks there consist of marble that is mineralized with abundant pyrite and local (5 x 20 centimeter) lenses of oxidized material that is magnetic. Pyrite content increases toward the vein and approaches 30%, occurring as fine disseminations that are laminated following folded bedding. This skarn type occurrence appears to have formed where the vein intersects the marble unit.
Surface drilling is recommended at the Glory Hole to explore strike or depth extensions of the vein occurrence and test the marble for skarn style mineralization.
No. 1 Vein
Approximately 350 metres southeast of the Glory Hole, a mineralized quartz vein 0.5 to 1 metre wide, labelled the No. 1 Vein, strikes northeast and dips steeply northwest. Historic mine workings have exposed the vein over a strike length of 35 metres. Mineralization in the vein consists of clustered and disseminated coarse-grained pyrite. The wall rocks to the vein are altered and also mineralized with quartz veinlets and disseminated pyrite. The mine level lies 15 metres below the surface where the vein outcrops and was mined from a number of slot trenches. The surface workings do not connect with the mine.
In 1978, samples of the vein returned up to 14.4 g/t Au (0.42 oz/t) and up to 137.1 g/t Ag (4 oz/t). A single drill hole was drilled, which intersected (1.52 m) (5 ft.) averaging 7.9 g/t Au (0.23 oz/t) and 582.9 g/t Ag (17 oz/t).
Channel samples collected in 2015 indicate significant gold mineralization with a high of 17.07 g/t gold over a 0.4 metre width.
The Glory Hole and No. 1 veins are part of a field of veins on the Boundary Falls property that exhibit similar textures and mineralization, including pyrite, chalcopyrite and local galena. These quartz veins are also exposed in historic shafts and trenches. The source of all these veins remains unknown but they appear have the characteristics of Orogenic type gold-quartz veins formed in metamorphosed terranes.