The Britannia West (Echo) occurrence is located on the north west side of the head of Howe Sound, approximately 5.5 kilometres west-southwest of the mouth of the Squamish River and 3 kilometres northeast of the mouth of Woodfibre Creek. A former adit is reported at an elevation of approximately 600 metres.

The area is underlain by Middle Cretaceous Coast Plutonic Complex granodiorite and granite.

Mineralization is reported to occur within small quartz veins and shears over an area of 140 square metres and is comprised of chalcopyrite, molybdenite, bornite, pyrite and pyrrhotite. Sericite and silicification occur along the quartz veins and shears.

A sample of pyrrhotite was analyzed in 1908 and was found to contain 0.70 per cent nickel (GSC Report 996). Gold and silver were reported to be appreciable. In 1958, narrow samples yielded up to 3.20 per cent copper and 27.4 grams per tonne silver over 3.0 metres (Ernest Hanson (1958-02-19): Property submission: Twinduc Group). In 1982, sampling of the adit yielded from 0.03 to 0.21 per cent copper and trace to 5.8 grams per tonne silver (Assessment Report 11121).

In 1907, exploration work included the commencement of a tram line and, in 1908, open cuts and a few short tunnels were constructed. In 1982 and 1983, Stackpool Minerals completed programs of geological mapping, rock, silt and soil sampling and an airborne geophysical survey on the area.