The test work was designed to quantify the recovery of barite.

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.