The KM 103 anomaly is located southwest of Twinkle Lake, near the 103-kilometre mark of the Morice Tahtsa Forest Service Road.

The area is underlain by the Lower to Middle Jurassic Hazelton and Bowser Lake Groups. The oldest rocks in the area are the andesitic fragmental unit of the Lower Jurassic (Sinemurian) Telkwa Formation of the Hazelton Group. These rocks have been described as thin to thick bedded red to green lapilli, lithic, crystal and ash tuff, tuff breccia, agglomerate and porphyritic andesite flows. Rocks of this unit exposed west of the claims are comprised of red, green and maroon agglomerate typical of the Telkwa Formation. To the east, the Jurassic rocks are unconformably overlain or in fault contact with a basal conglomerate attributed to the Cretaceous Skeena Group. To the west, the volcaniclastic rocks are in fault contact with highly fossiliferous sedimentary rocks of the Smithers Formation. The Jurassic sequence has been intruded by plugs of granodiorite and quartz-feldspar porphyry assigned to the Upper Cretaceous Bulkley intrusions.

In 2007 and 2008, Huckleberry Mines Limited completed a series of geophysical and geochemical surveys and 12 diamond drill holes, totalling 1566.5 metres, at the site. In 2007, a copper- in- till anomaly, of up to 522 parts per million copper, was identified over an area of 1600 by 950 metres; in conjunction with a previously identified magnetic and electromagnetic anomaly. In 2008, drilling returned 0.0087 per cent copper over the 130-metre length of drill hole 08-428, with the highest 2.5-metres intercept at 0.032 per cent copper (Assessment Report 30851).