The Rocky showing is located approximately 7.5 kilometres northeast of Lytton, with an elevation of 740 metres. Description of access to the property in 1988 was that it was only accessible by foot through several roads in varying stages of disrepair from the railway tracks, or by helicopter.

Regionally, the Mount Lytton Complex consists of granodioritic felsic rocks closely bounded by lower amphibolite and kyanite grade metamorphic rocks. These are overlain by the Lower Cretaceous Spences Bridge Group.

Locally, the area is underlain by Triassic Mount Lytton Complex intrusive rock. The series is described to be composed of granite, diorite, chloritized/calcified diorite, gossan (pyritized country rock), gabbro, mixed bands of granodiorite and diorite, quartz diorite and a lower basic series.

Disseminated chalcopyrite with associated minor magnetite and pyrrhotite occur in layered intrusives comprising anorthosite, granodiorite and gabbro. Intense albitization occurs along fractures and faults. Chlorite is common. Quartz, calcite and minor chalcopyrite fill fractures. General attitude of the layering strikes 325 degrees and dips 30 degrees east. Layered rocks are intruded by andesite dykes and quartz diorite. The relatively recent discovery of a massive sulphide outcrop led to the anomalous sample result (sample 6216; Assessment Report 17729).

In 1986, a panned concentrated silt sample collected near the mouth of the creek draining Rainbow Canyon returned a value of 14 100 parts per billion gold, a grab sample from outcrop assayed 8340 parts per billion gold, and a composite sample of gabbroic material collected from a pile of dumped core assayed 0.11 gram per tonne platinum (Franzen, 1986). In 1987, An ICP analysis of the anomalous rock chip sample (6216), found well up in Rainbow Canyon, returned 34,680 parts per million zinc, 1789 parts per million copper and 107.1 parts per million cadmium (Assessment Report 17729).

Twelve vertical drillholes (less than 800 metres) were drilled in 1963 and some trenching was completed by Patino Mining Corporation Limited (Annual Report 1963). Geological mapping and a magnetometer survey were carried out in the area in 1970 by Lytton Minerals Limited. Greenlake Resources Limited collected a total of 62 samples in 1988 consisting of 18 rock chip samples, 28 float samples and 16 silt samples.