Potential 100m zone identified by First Cobalt

Potential 100m zone identified by First Cobalt

First Cobalt has announced positive assay results from the first drill holes from near the Kerr Mine in the Cobalt North area of the Cobalt Camp in Ontario, Canada.

Results from these holes indicate a potential zone of cobalt mineralisation that can be tracked across more than 100m.

Trent Mell, president and CEO says, “Cobalt North showed significant promise during the 2017 surface sampling and mapping work. These initial results confirm some of the early ideas we have for the structural setting for this area that make it highly prospective.” Results have been received from the first two holes in the Kerr Lake area drill programme in Cobalt North identifying a new mineralised zone (Figure 1). Cobalt and silver occur as minerals within both quartz and calcite veins, as well as disseminated in the wallrock.

“Indications of both disseminated and vein styles of mineralisation across a network for more than 100m make this an attractive target for a future bulk tonnage operation. With zones of mineralisation now identified in Cobalt South and Cobalt North, we are seeing multiple opportunities in the Cobalt Camp for future primary cobalt sources to supply the North American battery market.”

Assays from FCC-18-0023 returned 10.41m of 0.15% Co and 44g/t Ag, including 0.30m of 0.75% Co and 126g/t Ag, from approximately 50m below surface. Hole FCC-18-0023 was collared over 160m to the southwest of FCC-18-0021 and intersected mineralisation of 2m of 0.32% Co and 208g/t Ag, including 3.81% Co and 1 225g/t Ag over 0.32m.

Mineralisation is interpreted as continuous between these two holes based on core orientation measurements. Both holes were drilled using core orientation tools to accurately measure the strike and dip of veins, lithological contacts and other structures. Individual veins at various orientations have been intersected but the general trend of veining is eastward. An additional three holes have been drilled in between and along strike of the major veining trend with assays now pending. Logging of these holes indicates a potential network of mineralisation across more than 100m.

In hole FCC-18-0021, anomalous zinc (>0.4%) occurs as a broad zone, from 64.85 to 73m, as a halo around the cobalt-silver mineralisation. The occurrence of copper, zinc and lead coincident in both holes with cobalt and silver represents multiple stages of fluids carrying metals that have concentrated along a conduit as a broad zone of mineralisation. This broad zone is interpreted to have developed along the limb of an antiform, folding both the Huronian sedimentary rocks and the underlying Archean volcanic and sedimentary rocks.

The Nipissing Diabase is also folded along this antiform. The contrast in competency between the Diabase and the surrounding rocks may have allowed this broad mineralisation zone to develop. The extensive vein network mined at the Lawson, Kerr, Drummond mines and beneath Kerr Lake is interpreted to comprise the other limb of the antiform, making the geologic setting of this entire area prospective for cobalt-silver and copper-zinc-lead mineralisation.

Table 1: Summary of assay results
Table 1

Historic mining was prolific from several underground operations at Drummond, Kerr, Lawson, Hargrave and Conisil. Mining began in 1905 and the most recent mining occurred at Conisil between 1961 to 1965. Over 37 million ounces silver and more than 900 000 pounds of cobalt were produced from these mines. Historic mining in the immediate area of drilling focused on north-south trending veins. Modelling by First Cobalt of historic drilling and regional structural interpretations revealed an eastward trending structure parallel to the main trend of folding. Drill holes were targeted on this interpreted structural zone where host rocks are folded and locally faulted. The lack of underground mining along this eastward trend may reflect the cobalt-rich content of mineralisation.

Cobalt North

First Cobalt’s properties in the Cobalt North area include the past-producing Drummond, Kerr, Silver Banner, Juno, Silverfields, Hamilton, Ophir, Lawson and Conisil mines. Cobalt has not previously been an exploration focus in this area although limited exploration activities in the 1970s and 1980s around Kerr Lake focused on Cu-Zn-Pb mineralisation within the Archean rocks. Cobalt had not been assayed previously, so the potential for an extensive polymetallic mineralisation system remains to be explored.

The 2018 Cobalt North drill program consists of 17 000m with 3 500m in the Kerr Lake area designed to test trends in mineralisation found in historic drilling and major structures interpreted to be associated with mineralisation. Disseminated polymetallic cobalt-silver-copper-zinc-lead mineralization has been recognised in samples from underground material in muckpiles from the Drummond mine showing a wide range of styles occur in this area.


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