The London (Don Fraction) occurrence is located on the northeast side of the Indian River near Roy Creek, approximately 16 kilometres southeast of Squamish. The Roy (MINFILE 092GNE001) occurrence is located approximately 500 metres to the south east.

The area is underlain by an elongate, northeast- trending, stock of phyllic-propylitic –altered porphyritic quartz diorite, which intrudes a sequence of rhyolite and dacitic to andesitic pyroclastics. The volcanic rocks are part of the Lower Cretaceous Gambier Group and occur at the south end of a roof pendant. The pendant is enclosed in Late Jurassic diorite and quartz diorite of the Jurassic to Tertiary Coast Plutonic Complex. The stock is exposed over a 900 by 400 metre area.

The north east end of the stock is cut by numerous veinlets and lenses of quartz, up to 8 centimetres wide. These contain pyrite, chalcopyrite, sphalerite and trace molybdenite. Pyrite, and to a lesser extent, sphalerite and chalcopyrite, is also disseminated throughout this portion of the stock.

In 1923, a grab sample from the adit is reported to have assayed 0.70 per cent copper and 4.4 grams per tonne silver (Tom Heah [1984-12-01]: Geology and Geochemistry of the London Group Indian River, B. C. Rept. #144-016-84).

In 1964, diamond drilling from the London Tunnel portal intersected approximately 45 metres yielding approximately 0.3 per cent copper and 0.02 per cent molybdenum from near the southern contact of the stock (Tom Heah [1984-12-01]: Geology and Geochemistry of the London Group Indian River, B. C. Rept. #144-016-84).

In 1975, chip sampling from road exposures in London Slide area is reported to have yielded an average of 0.5 gram per tonne gold over 239 metres (Assessment Report 36023). Also at this time, sampling of trenches exposing chalcopyrite veins yielded up to 1.92 grams per tonne gold, 77.0 grams per tonne silver, 0.30 per cent zinc and 27.08 per cent copper, (Paul A. Lindberg [1975-09-29]: Geological Mapping and Economic Appraisal of the Indian River Section of the Britannia Claims).

In 1980, diamond drill hole IR-80-1, located approximately 500 metres up-slope to the north east, yielded an average of 0.1 per cent copper over the last 89.1 metres of the hole ending in mineralization, including 0.27 per cent copper and 0.13 per cent copper over 2.5 metres and 0.41 per cent copper over 1.6 metres (Assessment Report 36023). Similar zones of mineralization were encountered at the main London Slide zone in holes IR-80-2 and IR-80-3 with each yielding up to 0.12 per cent copper over 18 metres and 26.1 metres, respectively (Assessment Report 36023). Rock chip sampling of the main zone yielded 0.08 per cent molybdenum over 10 metres; including 0.11 per cent molybdenum over 5 metres from an area of molybdenite bearing quartz-pyrite veins (Assessment Report 36023).

In 1984, a grab sample (13806) from near the adit area, of a siliceous volcanic with pyrite veins and stringers assayed 13.3 grams per tonne silver and 0.979 per cent copper, while another grab sample (13841) of andesite tuff with sphalerite veins and quartz stringers, from an outcrop near the Indian River, assayed 0.145 per cent lead and 0.802 per cent zinc (Tom Heah [1984-12-01]: Geology and Geochemistry of the London Group Indian River, B. C. Rept. #144-016-84).

In the early 1920’s, a 33- metre long adit, now caved, was driven. Former workings are also described along the Indian River below the adit area. In 1962, Anaconda American Brass and Corporation acquired the claims. The area was drilled by Anaconda in 1964, 1980 and 1981. In 1984, Falconbridge Copper entered into an option agreement with Anaconda Canada and conducted programs of geological mapping and sampling on the area. The following year, a single drill hole, totalling 328 metres, was completed. In 2015, NEK Canada Mining Group completed a program of rock sampling and geological mapping on the area.