Drilling begins at Palmer VMS project
North of 60 Mining News – June 8, 2018
Last updated 9/25/2020 at 5:23am
Constantine Metal Resources Ltd. June 6 reported the start of a 10,000-meter drill program to expand the resource and test new targets at the Palmer volcanogenic massive sulfide project in Southeast Alaska.
Being carried out by a joint venture between Constantine (51 percent) and Dowa Metals & Mining Co. Ltd. (49 percent), this year's drilling will target the definition and expansion of the copper-zinc-silver-gold resource at the South Wall-RW deposit; expansion of the AG Zone, a new silver-gold-zinc rich discovery made last year; and test new targets across the district-scale Palmer property.
Drilling at South Wall will target areas west of strong 2017 drill results from the western edge of the mineral resource, as well as a fault-displaced offset of the zone at depth.
Highlights from the 2017 drilling in the expansion area at South Wall include:
• 45.4 meters grading 2.5 percent copper and 7.4 percent zinc in hole CMR17-82; and
• 14.5 meters grading 1.9 percent copper and 7.5 percent zinc, plus 10.5 meters of 0.5 percent copper and 8.5 percent zinc in hole CMR17-97.
Constantine said both target areas have potential to significantly expand the extent of mineralization beyond the bounds of the current resource.
This year's drilling will also target AG Zone, a high-grade silver-zinc target discovered last year about 3,000 meters south of the South Wall-RW deposit.
The 2017 drilling defined AG Zone mineralization over a strike length of 225 meters and a vertical dip length of 275 meters, with the zone open along strike and at depth.
AG Zone has yielded the best precious metal drill intersections at Palmer, including:
• 9.2 meters of massive barite-sulfide averaging 312 g/t silver and 0.9 g/t gold in the discovery hole; and
• 10.3 meters grading 461 g/t silver and 0.9 g/t gold;
The zone also hosts significant zinc mineralization, including:
• 7.8 meters grading 11.7 percent zinc; and
• 20.4 meters grading 9.9 percent zinc.
This year's drilling will test for expansions of this high-grade zone along strike and at depth.
Drilling will also test new exploration targets across the wider Palmer property.
The JV partners have identified 11 targets across a roughly 20-square-mile area with geophysical characteristics similar to the South Wall deposit, several of which coincide with areas of VMS-style mineralization and hydrothermal alteration exposed at surface.
An 1,137-line-kilometer electromagnetic geophysical survey flown over the Palmer property last year was used to prioritize targets to drill this year.
Two of these high priority targets are Boundary and HG, prospect that have never been drilled.
The Boundary prospect hosts numerous samples of high-grade mineralization. These include footwall-style stringer mineralization in outcrop grading up to 6.6 percent copper; float boulders of massive pyrite-chalcopyrite grading up to 13.6 percent copper; and massive barite-sphalerite boulders grading up to 19.7 percent zinc.
The interpreted source of the massive sulfide-barite float boulders is located under surficial cover and coincides with one of the most pronounced electromagnetic anomalies identified in the survey area.
Like Boundary, the HG prospect is defined by a large-scale alteration zone associated with massive sulfide-barite mineralization exposed at surface, with grab samples grading up to 14.1 percent zinc, 0.36 percent copper, 2.3 percent lead and 198.9 g/t silver.
A distinct airborne EM geophysical response is located immediately on strike of the 600-meter-long alteration zone.