The Jo 49 occurrence is situated near the headwaters of Humphrey Creek, approximately 20 kilometres northeast of Takla Landing. The showing was located in 1983 during a regional exploration program carried out in the Vital Range.
The upper Humphrey Creek area is underlain by locally cherty phyllite and andesitic flows assigned to the Carboniferous to Jurassic Cache Creek Complex. These rocks strike predominantly north and dip to the east. Bedding and foliation are parallel to subparallel and both large and small-scale folds are widespread. Evidence suggests that the rocks have undergone greenschist facies metamorphism.
In contact with the Cache Creek Complex rocks immediately west of the showing is serpentinite, formerly assigned to the Middle Permian to Late Triassic Trembleur intrusions and now termed Mississippian to Triassic Oceanic Ultramafites. This dark green to black-coloured unit is massive, sheared and hosts talc and chrysotile veinlets together with coarsely crystalline actinolite and tremolite. Local quartz-carbonate alteration of the serpentinite has resulted in tabular zones of quartz-ankerite-mariposite mineralization hosting variable amounts of pyrite, pyrrhotite and magnetite.
Locally, small, often lenticular masses of grey, rusty weathering felsitic and white to pink aplitic intrusions have been emplaced into the Cache Creek Complex members. In many cases, these intrusions were seen only as subcrop and as angular float trains.
The Jo 49 showing is described only as comprising sulphides(?) hosted within an andesite flow. One grab sample (RE-0038) from this showing assayed 4.0 grams per tonne gold and 17.0 grams per tonne silver (Assessment Report 12548, page 7). Attempts to reproduce this result proved unsuccessful (Assessment Report 14554). Another sample (RE-0184) taken of quartz stringers hosted by a felsite intrusion 150 metres south of sample RE-038 analysed 2.5 grams per tonne gold (Assessment Report 12548).
In 1983, Golden Porphyrite Ltd. completed an exploration program on the property containing the occurrence. Geochemical surveys outlined significant gold anomalous zones from rock chip and soil samples. The highlighted sample on the property, T304ARE-0038, graded 4.0 grams per tonne gold and 17.0 grams per tonne silver. Anomalous silver was observed in two areas of the property (Assessment Report 12548).
In 1985, Beauty Geological Ltd. completed geological and geochemical surveys on the property containing the occurrence. Anomalous gold and silver were observed in results. The highlighted sample from the property, CR-HMP-3V, graded 0.70 gram per tonne gold and 1.4 grams per tonne silver (Assessment Report 14554).
In 1987, Eric Shaede and Lorne Warren completed a prospecting program on the Gold claim group near the occurrence. Soil and rock sampling yielded maximum values of 38.2 grams per tonne gold in sampling lines and a maximum value of 59.1 grams per tonne gold from a sample of the tailings from the panning of a bulk soil sample, approximately 700 metres northwest of the Jo 49 occurrence (Assessment Report 17298).
In 2015, Jedway Enterprises Ltd. completed a prospecting program on the Den property containing the occurrence. Rocks with nephrite potential in four locations on the property were described and reported. Follow-up prospecting for jade potential was recommended.
