Deep hole expands Oban zone at Thorn
North of 60 Mining News – July 19, 2019
Last updated 9/26/2020 at 5:09am
Brixton Metals Corp. July 15 reported long sections of copper-gold-silver mineralization in drill hole THN19-150, which targeted deep porphyry mineralization in the Oban zone on the company's Thorn property in northwestern British Columbia.
This hole, drilled to a depth of 829 meters, extended the polymetallic mineralization at Oban 281 meters deeper than previous drilling.
From a depth of 97 meters, THN19-150 cut 554.7 meters averaging 0.57 grams per metric ton gold, 0.24 percent copper, 43.18 g/t silver, 0.55 percent zinc and 0.28 percent lead, including 277.8 meters of 0.86 g/t gold, 0.28 percent copper, 75.28 g/t silver, 0.88 zinc and 0.48 percent from a depth of 97 meters.
HN19-150 also cut two copper dominant zones – six meters of 3.56 percent copper, 3.37 g/t gold, 257.77 g/t silver from a depth of 155.7 meters; and 16 meters of 1.38 percent copper from 414.4 meters.
Importantly, this hole encountered an increase in porphyry-type veined clasts starting at 185 meters and sulfide-mineralized porphyry clasts from 429 to 677 meters, indicating porphyry affinity.
The hole ended in a low-grade mineralized interval that returned 42.4 meters of 0.15 g/t gold and 3.06 g/t silver from 786.7 meters to the bottom of the hole.
"In addition to expanding the mineralization to depth, the increase in mineralized porphyry fragments within the diatreme suggests that we could be near a mineralized porphyry," said Brixton Metals Vice President of Exploration Sorin Posescu.
Structural mapping and soil-rock geochemistry at the Chivas zone, as well as re-logging of select core from the Glenfiddich zone provide further evidence of porphyry mineralization and have refined targets for future drilling.
Hole THN13-121, which was drilled in the Glenfiddich zone about 1,000 meters west of THN19-15, identified an increase in A-type porphyry veins at the bottom eight meters of the hole.
"The geometry is still unknown, but we may be dealing with a tilted system which will require more drilling to determine this. The re-logging of hole 121, which is located about one kilometer west from hole 150, identified an increase in porphyry A-type veins towards the bottom of the shallow hole suggesting we may be closer to the porphyry center. All of this work strongly suggests the presence of a large porphyry system at the Thorn project," Posescu added.