Constantine: Recoveries of 93 Percent Zinc, 89 Percent Copper at Palmer Project

Constantine Metals (TSXV:CEM) is pleased to report metallurgical test results that demonstrate a premium-quality barite concentrate can be produced as a co-product at the Palmer copper-zinc-gold-silver project in Southeast Alaska.

The test work was designed to quantify the recovery of barite, a mineral that is abundant within the high-grade copper-zinc resource at Palmer that would otherwise become waste generated in the production of copper and zinc concentrates.

As highlighted in the press release:

Highlights of Barite Test Results:

• Barite recovery of 91.1 percent to a clean, high-grade barite concentrate with a high specific gravity (SG) of 4.44
• Produced barite concentrate meets all specifications for oilfield drilling grade barite, including specific gravity, particle size, and purity, and appears to be a market-ready product
• Simple flowsheet with barite recovered by flotation from the tails of copper and zinc flotation

Highlights of Copper-Zinc Test Results:

• Very high zinc recovery of 93.1 percent to a concentrate grading 61.3 percent zinc; an improvement in recovery of 8.2 percent and an increase in zinc concentrate grade over previous locked cycle tests
• High copper recoveries of 88.9 percent to a concentrate grading 24.5 percent copper; reproducing similar results to previous locked cycle tests
• Combined total silver and gold recovery to copper and zinc concentrates of 90.6 percent and 69.6 percent respectively, the large majority of which reports to the copper concentrate
• Grindability tests indicate a low bond work index of 6.3 kWh/tonne, which is considered very soft, and therefore will have low grinding cost and power consumption

Click here to read the full Constantine Metals (TSXV:CEM) press release.