A mineralized shear zone is hosted by altered Carboniferous rocks of the Stikine Assemblage. Rocks in the area consist mainly of fine-grained, dark clastic sedimentary rocks and intercalated volcanics. They have been intensely folded and sheared with the consequent development of slaty cleavage and foliation. Secondary mica has formed in most of the sedimentary rocks giving it a phyllitic texture. The volcanic rocks have been converted to mainly greenstone and chlorite-amphibolite schist.
The mineral occurrence consists of a well-defined shear zone about 3.3 metres wide, striking 310 degrees and dipping 50 degrees southwest. The shear is traceable from elevation 15 metres to 58 metres above the river. The shear zone is banded and reticulated in structure and is well mineralized with streaks, bunches, and veinlets of massive and disseminated stibnite, accompanied by fine disseminations of pyrite, in a gangue of quartz and calcite. In some places the stibnite has been extensively weathered to an antimony oxide, possibly stibiconite or cervantite. In some sections, the gangue contains greenish diffusion bands, which were identified as insoluble silicate, coloured by chromium. These are thought to be a very fine distribution of mariposite.
The mineralized shear zone is hosted by altered arkosic argillite, quartzite, and quartz-mica schists.
In 1930, a sample was taken from the quartz-rich part of the zone which was mineralized with pyrite and minor stibnite. This sample assayed 37 per cent antimony and contains no values in silver and gold (Minister of Mines Annual Report 1930). It was reported that the antimony ore is remarkably free from refractory impurities and may possibly be of commercial importance on this account.
In 1930, a group of ten claims was owned by Joe Hill and partner, of Tulsequah and a sample was taken from the quartz-rich part of the zone mineralized with pyrite and minor stibnite. This sample assayed 37 per cent antimony and was totally absent of silver and gold values (Minister of Mines Annual Report 1930). Work performed in the area of the Surveyor in 1991 for Erik Bergvinson consisted of minor geological mapping restricted to a stream gully, limited prospecting and establishment of a small soil grid at the north boundary of the property. Thirty soil samples were collected at 50 metre spacings from 100 metre-spaced lines. Also, 6 rock samples and 1 stream silt were collected from the drainage examined. Only three spotty anomalous gold values were returned from soil samples and no significant values were evident from rock analysis. Base metal values were low except for one strongly anomalous arsenic value in rock lines (Assessment Report 20323). The historic stibnite showings were not examined.
