Duluth Metals geologic model targets higher grade base & precious metal zones in Nokomis deposit
The modeling currently led by
“This work has gone a long way to explaining why we have much higher than typical Duluth Complex grades in many areas within our very large deposit,” stated Duluth Metals’ President and CEO, Dr.
The modeling has identified and provided an understanding of the origin of and controls on the distribution of four distinct types of higher-grade Copper-Nickel-Platinum-Palladium-Gold mineralization within the Nokomis Deposit mineralized system.
- Platinum Group Element- rich disseminated mineralization within the SKI on the Eastern side of the Nokomis Property. This area is known as the Eastern High Grade Corridor (21 drill holes as press released October 27, 2008). This large coherent zone of significantly higher grade PGE mineralization is the result of the initial constriction of the magma channel beneath a large block of older rocks within the Nokomis Deposit. Such a blockage impedes the flow of crystals and sulfide droplets. However, the liquid portion of the magma continues to flow along with its dissolved Platinum Group Elements ("PGE"). Once these dissolved and flowing PGE's come in contact with a stuck sulfide droplet, they instantly dissolve into the sulfide and increase the PGE grade of the sulfide. - Nickel-Cobalt enriched semi-massive sulfide mineralization at the base of the SKI (or immediately below) the main magma channelway through the Nokomis Deposit. This mineralization is believed to have formed by continuous flushing of hot magma through the channelway which melted footwall granitic rocks. These granitic melts were incorporated into the magma and induced the formation of new sulfide minerals beneath a crystal slurry. These new sulfides scrubbed the melt of nickel and cobalt and settled to the bottom of the system. - Copper-PGE enriched disseminated mineralization deep in the footwall below the magma channel. The ever-deepening (into the melting footwall) magma channel induced and pinned hydrothermal convection cells in the footwall beneath the magma channel. The water in the system was released from the footwall granitoids by thermal metamorphism and circulated Cu-PGE downwards beneath the channel way. - Top-Loaded Cu-PGE enriched disseminated mineralization in the SKI. To the sides of the magma channel way, the sulfide-bearing crystal- liquid slurry was intruded as batches of magma out and to the sides of the channel. Since these highly crystalline magmas are distal to the very hot main magma channel, they solidified quickly into sulfide-bearing troctolite. Once the silicates (olivine+plagioclase) are solid, buoyant fractionated sulfide (Cu-PGE) liquid and magmatic waters moved upwards through the solidifying crystal pile and precipitated Cu-PGE sulfide and hydrous silicate minerals beneath the overlying crystal-poor, liquid silicate magma.
A schematic model of the higher grade zones within the Nokomis Deposit can be viewed on the Company’s website at www.duluthmetals.com within this press release.
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SOURCE Duluth Metals Limited