Mackinaw Mine

Project Summary

The Mackinaw Mine property consists of 10 unpatented lode claims (200 acres) on Forest Service land in the Cascade Mountains of northwest Washington State. The claims cover an outcropping of ultramafic rocks that host a mineralized zone containing ore grade concentrations of nickel, copper, cobalt, and gold.  Mineralized serpentine can be traced on the surface for over 2600 feet.

Previous work on the Mackinaw mine has been intermittent production and exploration since the early 1900’s primarily for the gold and copper content. Underground workings consist of over 2000 feet of drifts, crosscuts and raises along 5 different adits.

Renewed interest in the 1940’s was sparked by emphasis on strategic metals during WWII and resulted in considerable research and exploration by USGS Strategic Minerals Investigators. Continued interest by the US Bureau of Mines in the 1950’s and 1980’s of the Nickel and Cobalt content resulted in additional assays and estimates of resources.

Economic Impact

Inferred reserves for the remainder for the known mineralized zone could be reasonably estimated at an additional 80,000 tons. Excellent potential for expansion of these figures lies in the downward extension of the main shear zone and locating other areas of similar enrichment within the ultramafic body. Marc Andrews, CEO/President of NexGen, stated that this acquisition is in line with the current administration’s policy of identifying and securing critical metals such as cobalt. NexGen is planning on an active field season this spring and summer to include mapping, sampling, drone reconnaissance and preliminary geophysical.

Figure 1. Looking southwest, the prominent peak in the foreground is ultramafic rock on the Mackinaw Mine property

Technical Reports

HISTORICAL ASSAYS (U.S. Bureau of Mines)

Location           type sample         Nickel                Cobalt                Gold               Copper

Adit #3 USGS 500 lb metallurgical 1.0% 0.05% 0.11 oz/ton 2.7%
Adit #3 Select grab 2.71% 0.20% 0.325 oz/ton 11.0%
Adit #3 (401) 9 foot channel 0.52% 0.06% 0.20 oz/ton 1.65%
Adit #3 (402) 10 foot channel 0.67% 0.03% 0.05 oz/ton 1.48%

Studies by the United States Bureau of Mines in their investigations of strategic metals have defined a resource for the principle ore body in adit #3 in the indicated category and have been estimated between 50,000 and 80,000 tons at a grade of 1.7% copper, 0.96% nickel, and 0.14 oz/ton gold, 0.04% Co.

Studies by the United States Bureau of Mines in their investigations of strategic metals have defined a resource for the principle ore body in adit #3 in the indicated category and have been estimated between 50,000 and 80,000 tons at a grade of 1.7% copper, 0.96% nickel, and 0.14 oz/ton gold, 0.04% Co.

The Muskox Intrusion

The Muskox Intrusion is one of the last undeveloped world-class Nickel-Copper-Platinum Group Element (PGE) prospects. NexGen Mining Inc (NXGM) is offering for exclusive sale a complete modern data set covering this property. It represents a significant investment of time and money and would allow the owner to begin an advanced exploration program immediately.