Benton has just recently signed a joint venture agreement with Platinum Group Metals Ltd (TSX: PTM) who will now operate the project. Benton is excited to have an eager partner on board who has the resources and expertise needed to advance this project and locate the source of the mineralized boulders.
The Bark Lake property consists of 19 Claims in the Boot Bay Area, Northwestern Ontario all of which are wholly owned by Benton. The total area of the property is 3884 hectares. The property is located in Map G-2709, in NTS map sheets 52B/10 and 52B/15.
The Bark Lake Property is underlain by ca. 2.690 – 2.698 Ga Archean Greenstone and Granitic rocks of the Quetico Subprovince and the Quetico Fault bounding the Wabigoon Subprovince to the north and Quetico Subprovince to the South (Percival and Easton, 2007). The Quetico Subprovince consists predominantly of meta-sedimentary rocks, derived migmatite and granite with a suite of Alaskan type mafic-ultramafic intrusions. These intrusions, called Quetico Intrusions, are commonly associated with the narrow meta-sedimentary belt that is wedged between the Quetico Batholith to the south and the Quetico Fault Zone to the north (MacTavish, 1999).
An early penetrative D1 fabric is prominent throughout the belt and predates emplacement of the Quetico Intrusions and calc-alkaline plutons (Percival and Easton, 2007). Subsequent deformation events were followed by low-pressure, high-temperature metamorphism that reached upper amphibolite to granulite facies at the center of the belt, and greenschist facies on the periphery (Percival and Easton, 2007). The belt was then intruded by late, crust derived granitic plutons and pegmatite dykes (Percival and Easton, 2007).
During the Phase I drill program, three primary lithologies were encountered. Greenschist facies metamorphism is the predominant grade with a moderate penetrative fabric host in the meta-sediments and a weak fabric in the ultramafic rocks. Minor sulphide mineralization was encountered in drilling, However high grade mafic-ultramafic boulders hosting massive magmatic sulphide were observed during surface mapping. Property geology is as follows:
This unit is light to medium grey-brown in colour, fine grain and exhibits a moderate to strong foliation. Foliation measurements taken during property mapping consistently gave an east-west strike, with dips ranging from nearly horizontal to vertical.
Mafic-Ultramafic Rocks (Quetico Intrusion)
Ultrmafic rocks were typically coarse grained pyroxenites with the occasional presence of biotite. Pyrrhotite was the most dominant sulphide mineral seen within the ultramafics with often lesser amounts of chalcopyrite and pyrite. This unit usually exhibited random grain orientation.
An orthogneissic unit was observed both in the field and in drill core. This unit ranged from fine grained up to pegmatitic. Composition consisted primarily of plagioclase with quartz, biotite and minor potassic feldspar. Sulphide mineralization was not seen in this unit. No mineral alignment was observed in most cases, although a weak foliation was occasionally observed.
Pegmatite dykes were observed cutting the meta-sediment unit within drill core and in mapping. This unit is composed of large euhedral to subhedral crystals (1-10 cm) of hornblende, biotite, potassic feldspar with minor amounts of magnetite, quartz and carbonate.