The Mayflower showing is located 1.25 kilometres west of the Highland Surprise (082KSW037), on the west side of Whitewater Creek. Kaslo lies some 27 kilometres to the southeast of the showing.

The main lithologies of the area are assigned to the Permian Kaslo Group, consisting of andesite flows and pyroclastics (greenstone), and tuffaceous sediments. Volcanics are extensively chlorite altered and schistose. Slates of the Triassic Slocan Group outcrop on the Mayflower (Lot 4458) Reverted Crown grant. Sediments and volcanics have been locally intruded by diorite and feldspar porphyry dikes and sills. Serpentinite is the most extensive rock type exposed in this area, forming northwesterly trending bands with steep southwest dips and extending up to 750 metres in width. Talc and asbestos are common alteration minerals associated with this serpentinite unit. The contact between the serpentinite and surrounding lithologies is faulted. The surface trace of this fault can be traced for several kilometres. Underground this fault is marked by a heavy talc gouge.

During prospecting in 1975, pods of sphalerite, galena and tetrahedrite were found along the contact between Slocan Group slate and stratigraphically underlying Kaslo Group greenstone. A grab sample was taken from the Mayflower lode during an exploration program by Rex Silver Mines in 1984. The sample, SSRk 47, yielded 267.15 grams per tonne silver, 7.75 per cent lead and 10.2 per cent zinc (Assessment Report 13465).