The area of the Crystal Lake occurrences is underlain by dioritic rock of the Early Triassic to Late Jurassic Brooks Diorite complex.
The 2009 and 2010 programs near Crystal Lake delineated several zones of mineralization hosted by diorite and having a spatial relationship to an interpreted fracture system. This system trends from the south at the Holler Lake-Kingfisher showing, through the Veronica Lake-Whiskeyjack showings and to the north, just west of Little Bennett Lake-Raven showing (Assessment Report 31727). Minerals observed at these localities were predominately pyrite, with lesser and varying amounts of chalcopyrite, plus/minus bornite, plus/minus malachite, plus/minus azurite and plus/minus chalcocite. Magnetite is pervasive throughout the groundmass of the hornblende-diorite host rock. Copper bearing minerals occur as fracture coatings in diorite and/or in small quartz veins.
At the Kingfisher-Holler Lake showing, chalcopyrite appears with pyrite and pyrrhotite in a heavily disseminated to layered sulphide unit. The Kingfisher showing occurs on the east shore of the narrows at Holler Lake. The mineralized exposure is 3 metres high by 6 metres wide and could not be traced further. The zone dips into the lake. Mineralization observed around Veronica Lake occurs as a coarse network of fracture controlled stockwork veinlets, fracture coatings and as disseminated sulphide grains in the adjacent altered rock.
Two trenches northeast of Veronica Lake were sampled, the Whiskeyjack 1 and 2 trenches. The trenches exposed outcrop of intensely propylitically altered, fine to medium crystalline hornblende diorite. Sulphide mineralization occurs as fine disseminated pyrite and fracture coatings with and without quartz veining. Veins observed contained 2 to 3 millimetre ribbons of pyrite with trace chalcopyrite and trace malachite.
At the Raven showing quartz breccia, chalcocite occurs as thin 1 to 2 millimetre granular aggregate fracture coatings and disseminations with malachite and azurite. High-grade (0.6 and 0.7 per cent copper) samples were found at the Raven showing. These samples contained elevated levels of gold (57.3 parts per billion and 33.1 parts per billion) and silver (greater than 100 grams per tonne) (Assessment Report 31727).
WORK HISTORY
In 1971, the H 1-106 claims were owned in 1971 by Rio Tinto Canadian Exploration Limited. The work on the property comprised 1533 soil samples, and some topographic mapping. Although little is known of the H showing, molybdenum and copper mineralization occur within mainly diorite but also in granodiorite and granite of the Topley intrusive suite. This occurrence is probably similar to a number of occurrences which occur to the northwest within similar rock types.
In 2009, Entree Gold Inc and Taiga Consultants collected 78 rock samples and 51 soil samples. In 2010, Entree Gold Inc and Taiga Consultants collected 146 rock samples and 104 soil samples and completed a 597.7 magnetic airborne TEM survey. The location of the “H” MINFIE showing could not be relocated and the MINFILE positioned location is presumed inaccurate.
Although little is known of this H showing, molybdenum and copper mineralization occur within mainly diorite but also in granodiorite and granite of the Topley intrusive suite. This occurrence is probably similar to a number of occurrences which occur to the northwest within similar rock types.
