Exploration underway at Pilbara-style gold target in Nunavut
Silver Range Resources Ltd. announced that exploration is underway on its Tree River Property in western Nunavut.
A geological crew began work in early August to verify the extent and tenor of known mineralization and to locate new mineralization along strike within the favourable host-rock unit. Work at Tree River and on the peripheral targets will be completed by the end of August, with results expected early in the fall.
According to the company press release, the mineralization at Tree River bears striking similarity to that found in gold-bearing Archean conglomerates in the Pilbara region of western Australia and the Witwatersrand in South Africa.
At Tree River, gold is hosted in quartz pebble conglomerate (QPC) overlying mafic volcanics at the base of an Archean greenstone succession. The QPC has a local mapped strike length of 4.8 km and is from 15 to 20 m thick.
The conglomerate is grain supported with pyrite and carbonaceous matter in the matrix. Pyrite is ubiquitous ranging from a background of 1-2 per cent to from 5-25 per cent in lenses within the conglomerate. Arsenopyrite, stibnite and sphalerite are reported to occur with pyrite.
The QPC is particularly enriched in gold with background values in excess of 100 ppb Au, numerous grab samples in excess of 1 g/t Au and local occurrences of high grade gold returning grab samples up to 142 g/t Au and channel samples up to 0.35 m @ 63.15 g/t Au. The host conglomerate is dated between 2,940 and 2,700 Ma based on detrital zircons in proximal sediments, placing it in the favourable time window for the “Great Gold Deposition Event” (Q. Hennigh, 2016).