The exact location of the Tidewater showing is not known. The Tidewater group of claims was described in the Minister of Mines Annual Report of 1922 as being situated 914 metres from the head of Fanny Bay and at an elevation of 427 metres above sea level.

The area is underlain by a persistent band, greater than 12 kilometres long, of stratified metavolcanic and metasedimentary rocks of the Upper Triassic Quatsino and Karmutsen formations (Vancouver Group). The band trends northwest and separates Jurassic to Cretaceous Coast Plutonic Complex rock of two different compositions, diorite and granodiorite.

Locally, shearing has developed within the band, parallel to bedding and the strike of the band. Lithologies include biotite schist, quartzite, pyritic schist, wacke, marble and skarn.

The Tidewater showing is described in the Minister of Mines Annual Report of 1922 as having a country rock that is considerably sheared and heavily stained with iron oxide, while in the sheared zones, occur fissures filled with magnetite-iron ore. On the Bonanza claim, part of the Tidewater group, deposits of magnetite outcrop in bluffs up the precipitous mountain side for approximately 183 metres elevation. In places these deposits reach a width of 3 metres or more.

In 1922 a sample from an open cut on the Bonanza claim assayed 60.4 per cent iron, 11 per cent silica, trace sulphur and trace phosphorous (Minister of Mines Annual Report 1922, page 242).

The area was originally explored in the late 1890’s in conjunction with the nearby Doratha Morton (MINFILE 092K 023) mine. Numerous pits and shafts were completed in the area during the early 1900’s. In November 1982, Charlemagne Resources Ltd. optioned 17 reverted Crown grants. In 1983, Bute Joint Venture completed a program of rock and soil sampling, geological mapping and ground magnetic and electromagnetic surveys on the area as the Koop and Strider claim groups. Falconbridge Limited entered into an agreement with Charlemagne and in 1985 and 1986 carried out geochemical surveys comprising 1687 soil and 440 rock samples, airborne magnetometer and electro-magnetic surveys over 300 kilometres, and a ground electromagnetic survey over 200 kilometres on the Alexandra and adjacent ground. The area was prospected as the Cordero property in 1991 and 1992 by Ripple Creek Resources. During 1997 through 2000, Thurlow Resources conducted exploration programs on the area, renamed the DM and Picton properties, on the HY, LO, and FILL 2-19 claims. The programs consisted of soil sampling, rock sampling, and geological mapping. In 2008, Cuda Capital completed a 561.4 line-kilometre airborne magnetic survey on the area.