The Stu 1-3 occurrence is located at an elevation of approximately 2200 metres on a northeastern mountain slope, approximately 2 kilometres west of the Frog River and 5 kilometres south-southwest of the confluence of the Pitman and Frog rivers.

Regionally, the area lies on the western edge of the Omineca Belt near the Kutcho fault, marking the boundary with rocks of the Intermontane Belt. The area is underlain by Early Jurassic granodioritic intrusive rocks of the Pitman Batholith with minor roof pendants of metavolcanic and metasedimentary rocks. Early regional mapping correlated these rocks with the Devonian to Permian Asitka Group based on lithological similarities (Geological Survey of Canada Open File 483). Fossil evidence from later regional mapping dates least part of the sequence as Mississippian (Geological Survey of Canada Paper 80-1B, pages 207-211). A tentative age of Devonian to Permian is given to these metamorphic rocks.

Five stratigraphic units have been recognized and are, from oldest to youngest, feldspathic chlorite schist; phyllite, sericite and calcareous sericite schist; massive rhyolite, chert and sericite schist; carbonate and an upper feldspathic chlorite schist. The rocks are complexly folded and have undergone at least two phases of deformation. They are predominantly calc-alkaline with minor alkaline members. The sequence is similar in many respects to rocks of the Kutcho Formation in the southeastern corner of the Cry Lake map area (NTS 104I).

Locally, a medium-grained monzonite hosts quartz veins, varying from 0.2 to 1.0-metre wide, with semi-massive copper sulphides (bornite and/or chalcopyrite?).

In 2012, six samples (129377 to 129382) yielded from trace to 0.6 gram per tonne gold, 2.4 to 62 grams per tonne silver and 0.982 to 3.9 per cent copper (Assessment Report 33391).

Work History

The area has been historically explored in conjunction with the nearby Frog (MINFILE 094L 014) occurrence.

In 2011, International Samuel Exploration Corp. optioned the Frog property and completed a program of prospecting, rock sampling and a 1029.0 line-kilometre airborne magnetic geophysical survey. The following year, a program of prospecting, talus slope sampling, detailed petrological analysis of outcrop and subcrop mineralization and fluid inclusion studies was completed.

In 2014, CJL Enterprises completed a program of geochemical and geophysical data review and rock sampling. The following year, a program of mineralographic and petrographic sampling was completed. In 2017, a total of 158.0 line-kilometres of airborne magnetic surveys were completed on the area as the Frog South and North properties. The following year, a program of 3-D magnetic modelling was performed on the previous year’s geophysical data.