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McCleery Copper-Cobalt Project

Introduction

Overland owns 100% of the McCleery Copper-Cobalt Project in the Yukon Territory, Canada that comprises 42 claims covering approximately 9km2. The McCleery Project is located 170km southeast of the Yukon’s capital, Whitehorse and 40km northeast of the community of Teslin in south-central Yukon (see Figure 1). A tractor trail/winter road provides access from the Alaska Highway to within 10km of the Project.

Previous exploration at the Project focused on copper mineralisation with rock samples assaying up to 15.6% Cu and 420g/t Ag. Historic reports indicate only one sample from the Project has ever been assayed for cobalt and it returned 0.76% Co and 14g/t Ag. Multiple occurrences of cobalt are reported approximately 1km apart, with favorable lithology mapped between them. The mapped occurrences contain the minerals cobalt bloom, which is a secondary cobalt mineral, erythrite, and cobaltite, a primary cobalt sulphide.

The Project has not been explored since 1983 and there has never been any drilling. There has never been any focus on the cobalt potential of the Project; rather previous exploration was in pursuit of copper and tin.

 

Figure1LocationOfTheMcCleeryCobaltProject400WideApr17

Figure 1. Location of the McCleery Cobalt Project, Yukon Territory, Canada

 

History and Previous Work

The first recorded exploration in the area was conducted by Atlas Explorations Limited in 1970. Geological mapping was undertaken, with two copper showings and a cobalt showing identified in skarns. No assays are reported.

In 1975 United Keno Hill Mines Ltd (UKHM) conducted mapping and soil sampling. 1,026 soil samples were assayed for copper, with three significant coherent copper-in-soil anomalies delineated, with assays up to 820ppm Cu. UKHM attributed the high tenor anomalism to “structural effects, topographic effects and mapped mineralisation” but did not follow up with any drilling.

In 1982 and 1983 J.C Stephen Exploration Ltd identified tin mineralisation in the Project area, with rock samples assaying up to 950ppm tin and 375ppm tungsten. In 1982 they carried out mapping and submitted 35 rock samples for analysis, only one of which was assayed for cobalt. This returned:

  • 0.76% Co and 14g/T Ag

Only 14 of the 35 samples were assayed for copper, with over half the samples returning values greater than 1.0% Cu. Some exceptional results were returned, including:

  • 15.6% Cu and 420g/T Ag
  • 11.7% Cu and 354g/T Ag, and
  • 5.0% Cu and 174g/T Ag

Several other showings in the area were reported to host cobalt minerals, including cobalt bloom, a secondary cobalt mineral known as erythrite and cobaltite (cobalt sulphide). The more significant reported cobalt occurrences are separated by about 1km, with favourable lithologies present between them.

A ground magnetic survey was completed, with a magnetic anomaly found to be coincident with the copper-in-soil anomalies. But no further work was recommended.

There doesn’t appear to have been any exploration undertaken on the Project since 1983.

 

Figure2GeologyAndSampleLocationsAtTheMcCleeryCobaltProject400WideApr17

Figure 2. Geology and sample locations at the McCleery Cobalt Project, Yukon Territory, Canada