Canadian Mining Journal


COPPER-ZINC: Kutcho tests recover 92% Cu and 84% Zn from BC project

Upside potential at the three deposits that make up the Kutcho copper-zinc project. (Image: Kutcho Copper Corp.)

BRITISH COLUMBIA – Ongoing metallurgical tests of samples from the Kutcho copper-zinc project 100 km east of Dease Lake delivered better results than in an earlier pre-feasibility study for Kutcho Copper Corp. of Vancouver.

The recent locked cycle tests on material from the Main lens point to 92.3% copper and 84.2% zinc recoveries. Tests were conducted on composite A, which had precious and base metal grades that approximate those of the measured and indicated resource, as was the pyrite content. Other tests were run on composite B, which had a higher pyrite grade.

Copper concentrate made from composite A graded 26.6% copper, 4.7% zinc. That represents a 92.3% recovery of copper. The zinc concentrate graded 59.7% zinc and 0.9% copper with a recovery rate of zinc reaching 84.2%.

Copper concentrate made from composite B graded 27.1% copper and 6.0% zinc, for a copper recovery of 82.6%. The corresponding zinc concentrate graded 58.6% zinc and 0.9% copper. The zinc recovery was 63.2% for composite B.

The tests were conducted at Base Metallurgical Laboratories in Kamloops, B.C. The flowsheet was simplified – one stage of floatation cleaning in the copper circuit and two in the zinc circuit – from the arrangement proposed in the 2017 pre-feasibility study.

The combined resource estimate for the three deposits at the Kutcho includes 17.3 million measured and indicated tonnes averaging 1.85% copper and 0.49% zinc. The inferred resource is 10.7 million tonnes at 1.18% copper and 1.76% zinc.

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