Cantex said last month it had a 32-man camp in place with three rigs targeting the massive sulphide zone, as it aims to define "a world-class silver-lead-zinc deposit".

A helicopter-borne magnetic survey was due to start this month, in addition to other geophysical surveys already completed, to help determine "the exact location of the massive sulphide mineralisation" beneath glacial till between the Discovery and Extension zones, test the extremities of the mineralised zone and a potential second mineralised zone.

"The Cantex team are exceedingly optimistic about the summer programme and look forward to better defining the subsurface extent of the 2.4km-long massive sulphide zone which has been identified by soil-talus sampling, prospecting, trenching and drilling," the company said at the time.

Its shares are trading around a seven-year high, touching C$5.99 intraday on Friday.

Cantex had reported standout results from North Rackla in November of up to 51.14% zinc and 39.63% lead, from drilling results which had exceeded the previous testing limit.

Its shares had spent much of 2018 around the 20c mark and closed up 17% to 60c on the November news.
 
The company is chaired by Dr Charles Fipke, who is credited with the discovery of what is now the Ekati diamond mine.

Cantex closed an increased private placement priced at $1 in March, raising $15 million (US$11.5 million) rather than $10 million due to increased interest.
 
At Friday's close of $5.62, the company is capitalised at $256 million (US$196 million).