The B occurrence is situated in the Swannell Ranges (Omineca Mountains) on a west-southwest flowing tributary to Rottacker Creek, approximately 53 kilometres east-southeast of Takla Landing.

The area is underlain by mesozonal plutonic rocks assigned to the Late Triassic to Early Cretaceous Hogem Intrusive Complex which have intruded predominantly sedimentary rocks of the Middle Triassic to Lower Jurassic Takla Group and Lower Cretaceous Uslika Formation to the northwest. The plutonic rocks form an elongate batholith, extending from Chuchi Lake, and north to the Mesilinka River.

In the area of the occurrence, sheared and silicified quartz monzonite/granodiorite cut by several directions of faulting is exposed in a 15 metre wide pit just north of the creek. Chalcopyrite, pyrite and hematite occur with quartz and calcite in stringers and as disseminations along fractures and joints parallel and adjacent to a major fault zone striking 156 degrees and dipping 63 degrees to the northeast. The quartz monzonite adjacent to the zone appears to have been potassically altered. Malachite staining is also evident in quartz monzonite exposed on either side of the creek. A vertically dipping, 5 centimetre wide quartz vein with pyritic margins is exposed for approximately 6 metres west of the fault zone.

A 3 metre wide, rough chip sample across the zone assayed 0.14 per cent copper and 4.46 grams per tonne silver (Assessment Report 3407, page 6). No recent information concerning this occurrence is available.

WORK HISTORY

A copper showing was first discovered along a trap line along Rottacker Creek in 1960s.

In 1967, Cominco Ltd conducted geochemical survey sampling consisting of 326 samples of soil and stream samples on their B 1-20 claims (Assessment report 1064).

In 1969, the Umex-Wenner Gren Joint Venture conducted reconnaissance and stream sediment sampling. Anomalous molybdenum led to staking.

In 1971, Nation Lake Mines Ltd collected 369 soil samples which, when analyzed, identified a discontinuous 300 metre by 1500 metre copper-molybdenum soil anomaly (Assessment Report 3407).

In 1980, Dome exploration evaluated the claims for tungsten and molybdenum potential. Silt sampling, 10 test soil profiles and 52.5 line kilometres of magnetic surveys were completed.

In 1991, Grand America Minerals Ltd conducted an airborne electromagnetic and magnetic survey consisting of 719 line kilometres (Assessment report 21551).

In 1992, follow up work was reported (by Serengeti in 2013) that included reconnaissance survey grids, geological, rock (5) and soil (110) sampling. Copper values in rock samples ranged from 1905 to 9230 ppm. No porphyry style mineralization was located. Exploration targets include a malachite infilled shear zone.

In 2011, Kiska Metals conducted soil geochemistry extending from Heath-North soil grid onto the Rottacker property (Assessment Report 34932).

In 2013, Serengeti Resources completed property-wide prospecting, silt and rock geochemical sampling collecting 28 silt samples and 48 rock samples (Assessment Report 34654). A number of rock samples were collected proximal to and over the B-Showing. Copper values, ranged from a 7.6 parts per million to 6.6 per cent; gold values ranged from 2.8 parts per billion to 1.2 grams per tonne gold; zinc values range from 13 to 0.47 per cent and; lead values range from a 0.7 part per million to 0.015 per cent lead (Assessment Report 34645).

In 2014, Serengeti completed a targeted soil sampling program and prospecting; collecting 19 rock samples, 74 B-horizon soil samples and 53 Ah-horizon soil samples (Assessment Report 34654). The general distribution of the most anomalous soil samples occurs 500 metres to the west of the B showing. Highlights from rock samples include 6.8 per cent copper, 5.7 grams per tonne gold, 464 grams per tonne silver in rusty and weakly magnetic, highly altered granodiorite intrusive with coarse pyrite and fine chalcopyrite and bornite from B showing subcrop (sample 2692003, Assessment Report 35489).