The exact location of the original Bonanza showing is not clear. It is assumed to be about 300 metres east of American Creek, approximately 1.5 kilometres north of the confluence with the Bear River, 21 kilometres north of Stewart. An adit is shown at this location on Geological Survey of Canada Maps 216A and 217A.
The area is underlain by north trending, east dipping argillites of the Lower Jurassic Unuk River Formation (Hazelton Group) (Bulletin 58; 63). These rocks lie on the east limb of the north trending American Creek anticline.
A conformable quartz-calcite vein, trending north and dipping 45 degrees east, is hosted in sheared argillite. The vein, 0.25 to 0.60 metre wide, contains fragments of argillite and is sparingly mineralized with galena, sphalerite, chalcopyrite and pyrite. The vein may extend over a length of 300 metres (Geological Survey of Canada Memoir 159). Several other weakly mineralized veins have been reported in the vicinity. One of these (the Keystone showing?) comprises a 1.2 metre wide quartz vein. The vein, hosted in andesite, is mineralized with sphalerite, chalcopyrite and minor galena (Minister of Mines Annual Report 1929).
In 2008, diamond drilling on the showing intersected numerous parallel to subparallel fissure-filled, argentiferous quartz-sulphide veins. Mineralization consisting of galena, sphalerite, chalcopyrite and pyrite occurs as massive to semi massive lenses, pods and stringers in vuggy quartz. These veins are located in a zone at least 1.5 metres wide and have been traced for at least 60 metres. The best results were in drillhole SCR-2008-2 which intersected 0.46 metre grading 8.3 grams per tonne silver,0.11 per cent lead and 20.1 per cent zinc; and drillhole SCR-2008-8 which intersected 2.13 metres grading 23.3 grams per tonne silver,1.48 per cent lead and 4.05 per cent zinc (Assessment Report 29913).
The original workings were first reported in 1910. At that time two shafts and some stripping were done on a vein, 76 metres long. Opencutting and trenching were reported in 1912. During 1925-31, the showing was included in the Galena Farm (Galena Farm 1?) claims, which formed part of the earlier (1925) Galena Farm and later (1927-31) Keystone claim groups. Tunnelling appears to have been done during this period, but the exact location and nature of the work is unclear. About 1.5 kilometres up American Creek, mineralization has been reported on the Morning claim. This claim was included in the variously named Morning, Morning Canyon and Morning Jubilee claim groups during 1925-31. Two short adits have been driven on calcareous tuff containing minor pyrite and sphalerite (Geological Survey of Canada Memoir 159 and 175). The Morning produced 1337 grams of silver and 32 kilograms of lead from 1 tonne of ore in 1936. In 2008, a diamond drill program on behalf of Decade Resources Ltd. was conducted on the Silver Crown 6 claim which now covers the showings area. The drilling comprised a total of 1402.45 metres in nine holes. Drilling was conducted in an area where trenching in 2006 yielded an assay of 0.09 gram per tonne gold, 167.3 grams per tonne silver, 1.72 per cent copper, 22.7 per cent lead and 8.44 per cent zinc over 1.5 metres of width within a massive sulphide lens.
