The Petty occurrence is located on the southern flank of Table Mountain, on the north shore of Graham Inlet between Tagish and Atlin lakes, approximately 15 kilometres northwest of the community of Atlin.
The country rock on the property consists of andesitic flows and tuffs of the Middle Triassic to Lower Jurassic Cache Creek Complex. However, they could be part of the Carmacks Group as indicated by Wheeler et al. (Geological Survey of Canada Open File 1565). This volcanic package is intruded by a narrow, dioritic to quartz dioritic dike of the Late Tertiary Klusha Intrusions. These dikes may be the hypabyssal equivalent of the Fourth of July Creek batholith (Middle Jurassic Three Sisters Plutonic Suite).
The showing consists of a quartz-calcite vein hosted within the dioritic dikes. It may be the extension of the Dundee vein (104N 003) located 170 metres to the north, but fault displacement makes the correlation difficult. The vein strikes 030 degrees and dips about 40 degrees to the northwest. Inconsistent mineralization in the vein comprises galena, chalcopyrite and lesser pyrite, azurite, and malachite. One small cavity was lined with the rare mineral linarite (a base sulphate of lead and copper). Smaller veins occur within 0.6 metres of the main vein and the wallrock in between is often mineralized with galena and chalcopyrite. Unlike the Dundee occurrence, the wallrock surrounding the Petty veins is not mineralized. The veins are also of a much more consistent thickness on the Petty property.
The Dundee showing (104N 003) adjoins to the north and work was done on both of the properties in the early 1900s.
In 2011-12, Blind Creek Resources Ltd. carried out soil, rock, and panning sampling on their Tagish Lake property after staking the area in 2010. In 2011, 168 soil samples and 4 rock samples were collected in the Graham Creek watershed and slopes of Table Mountain. During 2012, two small historic adits were located. In 2013, Blind Creek Resources Ltd. continued work on their Tagish Lake property and collected 40 talus soil samples and 12 talus rock samples for analytical testing from the southeast slopes of Table Mountain.
