The London 1 occurrence is located in the north eastern Brooks Range, approximately 10.5 kilometres east of the Klaskish River mouth.
The area lies within the Insular Belt of the Cordillera and is underlain mainly by volcanics, crystalline rocks and minor sediments. Andesitic to rhyodacitic lava, tuff and breccia of the Lower Jurassic Bonanza Group overlie an assemblage consisting of Paleozoic Sicker Group sediments and Upper Triassic Vancouver Group basalts and minor carbonate and clastic sediments. The Bonanza volcanics are coeval with, or genetically related to, granodiorite stocks of the Jurassic Island Plutonic Suite which intrude all older rocks.
The London occurrence consists of 3 patches of pyrite-veined magnetite, up to 0.4 metres thick, which occur over a distance of 150 metres. These patches are hosted by Vancouver Group, Karmutsen Formation porphyritic flows. An intrusive breccia lies nearby along an east trending fault. The pyrite veins strike 020 degrees, parallel to the flows, and dip 78 degrees east. Pyrite content is 5 to 15 per cent. Malachite staining is associated with the magnetite.
The occurrence represents showings #1,2 and 3 in Assessment Report 12913 (page 10, Appendix). Showing #6 and #8 (from the same report) are located on the #2 grid and 500 metres to the north, respectively. The #6 showing is in a 300 by 150 metre, 75 metres thick silicified zone containing erratic mineralization, with up to 5 per cent pyrite, 4 per cent sphalerite and traces of native sulphur (Assessment Report 12913, page 11). The #8 showing contains disseminated chalcopyrite in leucocratic intrusive or silicified volcanic rock.
The area was originally staked in the early 1960s by Riocanex Ltd. During 1963 and 1964, Riocanex conducted geochemical sampling, limited geological and self-potenial surveys and drilling exploration. The claims were allowed to lapse and were staked in 1969 by Vanco Explorations Ltd. Vanco conducted geological, geochemical and ground magnetometer surveys over the "Lois" stock and the surrounding area. In addition, about 16 kilometres of induced polarization survey were run over the northern portion of the stock. In the mid-1970s, under a joint venture between Vanco and Esso Minerals, limited mapping and the drilling of a single 214-metre deep diamond-drill hole were executed. The property was subsequently dropped. In 1984, Brinco Mining Ltd. optioned the property from Jim McDonald as part of a larger property extending north, south and east (see Iron Cap (092L 228) and Fang (092L 265)). The company conducted detailed geological mapping near Hart Lake on the Bozo 4 claim and reconnaissance mapping on the eastern portion of the claim. Gold Leaf Ventures optioned the property from Jim McDonald and during the 1988 and 1990 field season laid out a new grid in the Northwest portion of the Bozo claim, collected 663 soil samples and conducted 20 kilometres of ground magnetometer and VLF-EM surveys. During 2010 through 2012, Compliance Energy completed programs of geological mapping and rock, soil and silt sampling and 470 kilometres of airborne magnetic, electromagnetic and radiometric geophysical surveys on the area as the Nic Property.
