The Mayflower showing is located approximately 800 metres north- east of Olsen Lake. The showing is noted at two elevations, 300 and 600 metres, near a deep stream canyon which drains southward into Olsen Lake. The geology of the area consists of granodiorites of the Juro-Cretaceous Coast Plutonic Complex within which are contained small northwest trending remnants of metamorphosed country rock.

Chalcopyrite, pyrite and pyrrhotite occur in a skarn zone in limestone at a granodiorite contact. Two samples were taken for assay in 1921, one from the face of an upper adit at 600 metres elevation, and the other from the dump of pyrrhotite at the portal of the lower adit, 23 metres below. The first of these samples assayed traces only in gold, silver and copper; the second assayed gold and silver nil, and 3.7 per cent copper (Minister of Mines Annual Report 1921, page 221).