Carbonate Replacement Deposits (CRD) are bodies of metallic minerals formed by the reaction of hot magmatic fluids with carbonate rocks, such as limestone or dolomite. The hot, metal-bearing fluids are driven upward from the heat source, an igneous intrusion (Glover Mo-Cu Porphyry), and dissolves the reactive carbonate rocks when they encounter them. That reaction changes the chemistry of the fluid, causing it to precipitate metallic sulphide minerals that often contain lead, zinc, copper and precious metals such as gold and silver. The metallic sulphide minerals effectively “replace” the carbonate host as the reactive fluids dissolve a pathway through it.
Nearer to the source of the fluids, mineralization is often in the form of copper - gold skarn (Canyon Creek Skarn Deposit), transitioning to zinc - lead - silver mantos (4b Manto Zone; No.3 Manto Zone; No.2 Manto Zone) and chimneys. In the periphery of the system, the cooler fluids drop out precious metals silver and gold veins (No.1 Vein Zone Ag-Au ±Zn±Cu) form in the edges of the system.
The fluid path is always continuous, and therefore the metallic bodies are too. The Sun Metals team is using this knowledge to develop the Stardust exploration plans.
Stardust, formerly known as Lustdust, is a project with a rich exploration history dating back to 1941. This is our sweet spot. We’re attracted to data rich projects because we are able to identify opportunity where others have not. The previous exploration work at Stardust heavily de-risks the project and maximizes our potential for success.
Sun Metals is currently earning a 100% interest in Stardust. Approximately $25 million has been invested in exploration at Stardust previous to Sun Metals. Activities undertaken include 80,000 metres of drilling over 390 holes, 5,800 soil samples, two airborne magnetic and extensive mapping and prospecting.
Stardust is a large, coherent integrated porphyry-skarn-CRD-epithermal system. Regional geophysical and geochemical data indicate the system extends well beyond the identified mineralized zones. As shown in regional magnetics, a large, obvious intrusive complex is revealed that has been sparsely drilled. And when soil geochemistry is layered on, it reveals vast prospective areas that are untested. Compiling a database of 70 years of data, Sun Metals is creating the first comprehensive and modern exploration program undertaken at Stardust to create value at a large scale