The Cimadoro occurrences are located at elevations of approximately 500 to 600 metres in the southern headwaters of Deena Creek, on northwestern Moresby Island.

Regionally, the area is traversed by a northwest-trending belt of steeply dipping chert, argillite, calcareous siltstone, limestone and calc-silicate beds that are intruded by a series of gabbroic and diabase sills. The unit may be equivalent to the Pennsylvanian-Permian Cameron River Formation of the Buttle Lake/Sicker Group (‘sediment-sill unit’) of Vancouver Island. The belt is flanked to the northeast by Upper Triassic Karmutsen Formation (Vancouver Group) basalts. Karmutsen volcanics and a diorite intrusive, possibly of the Tertiary Kano Plutonic Suite, underlie the area immediately southwest of the Paleozoic belt.

Mineralization at surface is contained in four zones consisting of the Gord (West), Lower (Main), Upper and Cliff zones, which are distributed over a length of 210 metres along the northwest-trending faulted contact between the Cameron River Formation and Karmutsen basalts to the northeast. The zones consist of massive to semi-massive sulphide lenses up to 5 metres in length hosted in argillite, chert and limestone. Bedding strikes 150 degrees and dips 75 degrees to the southwest. Weak graphitic and chloritic alteration is locally present. The area is cut by numerous faults that are subparallel and perpendicular to bedding.

Mineralization consists of pyrite, sphalerite, galena, pyrrhotite, and chalcopyrite, occurring in varying amounts in the lenses. The Lower showing consists of crudely banded sulphides with an associated bed of barite. The Upper showing, located farther southeast, consists of fine laminations and wispy discontinuous bands of sphalerite and pyrite.

Two other showings and/or anomalous zones are reported along strike, approximately 1 kilometre to the northwest and 850 metres southeast of the Lower (Main) zone, respectively.

In 1988, a chip sample (61307) from the Gord (West) zone assayed 0.29 per cent copper, 0.07 per cent lead, 0.57 per cent zinc, 0.1 gram per tonne gold and 6.2 grams per tonne silver over 0.3 metre (Property File - Doromin Resources Ltd. [1988-09-18]: Preliminary Report - Cimadoro Gold Project). A chip sample (0316) from the Upper zone assayed 0.9 gram per tonne gold, 95.8 grams per tonne silver, 1.69 per cent copper, 0.17 per cent lead and 3.58 per cent zinc (Property File - G.G. Crowe [1991-01-01]: Summary Report on the Cimadoro Property, Queen Charlotte Islands, B.C.).

In 1989, a sample of oxidized clay fault gouge from the Lower zone assayed 41.55 grams per tonne gold, 1361.6 grams per tonne silver, 2.05 per cent lead and 0.27 per cent copper (Assessment Report 19263, sample G1304). Also at this time, sampling of the Gord (West) zone yielded up to 2.7 grams per tonne gold, 102.6 grams per tonne silver, 1 per cent copper and 15 per cent zinc (Property File - Doromin Resources [1989-03-13]: News Clipping - Doromin discovers new gold on the Queen Charlotte's). Diamond drilling, performed at this time, on the Gord zone yielded up to 13.7 grams per tonne silver, 0.10 per cent copper, 0.13 per cent lead and 1.34 per cent zinc over 1.3 metres in hole 89-TC-6 (Assessment Report 19705).

In 1990, diamond drilling in the area of the Lower zone yielded intercepts of 0.5 gram per tonne gold and 1.39 per cent zinc over 5.1 metres in hole 90DC02; 56.4 grams per tonne silver and 0.80 per cent zinc over 11.7 metres, including 1.2 grams per tonne gold, 127.6 grams per tonne silver, 1.63 per cent lead and 2.45 per cent zinc over 1.2 metres in hole 90DC05; 0.6 gram per tonne gold, 101.5 grams per tonne silver and 0.82 per cent zinc over 3.3 metres in hole 90DC06; 0.8 gram per tonne gold, 133.4 grams per tonne silver, 0.63 per cent copper, 3.90 per cent lead and 9.55 per cent zinc over 2.4 metres in hole 90DC08 and 104.3 grams per tonne silver, 0.44 per cent copper, 0.319 per cent lead and 10.01 per zinc over 2.7 metres in hole 90DC09 (Property File - G.G. Crowe [1991-01-01]: Summary Report on the Cimadoro Property, Queen Charlotte Islands, B.C.).

Surface sampling performed at the same time yielded up to 2.05 grams per tonne gold, 103.9 grams per tonne silver, 0.03 per cent copper, 0.21 per cent lead and 0.26 per cent zinc over 1.5 metres from the Lower zone, whereas the average of 10 1-square-metre panel samples from the Upper zone yielded 0.57 gram per tonne gold, 83.95 grams per tonne silver, 0.81 per cent copper, 0.92 per cent lead and 8.09 per cent zinc (Property File - Teck Explorations Ltd. [1990-01-01]: Pseudo Cross Sections (Looking Southeast) - Main Massive Sulphide Showings - Cimadoro Property). Grab samples (no.0202) from the Cliff zone yielded up to 1.1 grams per tonne gold, 77.0 grams per tonne silver, 0.48 per cent copper, 0.21 per cent lead and 4.78 per cent zinc (Property File - G.G. Crowe [1991-01-01]: Summary Report on the Cimadoro Property, Queen Charlotte Islands, B.C.).

In 1991, drilling on the Lower zone returned up to 16.78 per cent zinc, 5.33 per cent lead, 0.39 per cent copper, 173.5 grams per tonne silver and 0.27 gram per tonne gold over 1.6 metres (Assessment Report 22952, page 3). Also at this time, sampling of the Upper zone returned values of up to 12.05 per cent zinc over 2 metres with other metals averaging 0.6 per cent copper, 0.7 per cent lead, 74 grams per tonne silver and 0.5 gram per tonne gold (Assessment Report 22952, page 3).

In 1993, drillhole BH87009, located south of the main zone, intercepted a dark-grey chert with pyrite yielding 0.118 per cent zinc over 1.5 metres and 0.575 grams per tonne gold over 0.77 metre, whereas another hole (BH87010), located to the east of the main zones, intercepted a brecciated chert with pyrite yielding 0.270 per cent zinc over 0.60 metre (Assessment Report 22952, page 4).

This prospect was discovered in 1988 by E. Specogna after following up on stream sediment samples that contained anomalous copper. Doromin Resources conducted geological mapping and sampling in 1989. Teck Corp. optioned the property shortly afterwards and continued exploration by collecting 38 stream sediment samples in 1989 and drilling six diamond drill holes, totalling 956.1 metres, in 1990. In 1991, Doromin Resources continued work and drilled nine short holes. The property was re-optioned to Inco Explorations, who flew airborne VLF and magnetometer surveys in 1992, and drilled four holes, totalling 910 metres, in 1993.