Brigus Gold has completed the construction of new underground infrastructure at Black Fox Mine in Ontario, Canada, and has begun underground ore production.

The firm has completed a 1.1km ramp from surface to the 235m level underground, which allows the firm to use the larger and more productive haulage fleet as part of the underground mine plan.

The firm expects the Black Fox Mill to operate at 2,000tpd with feed coming from both the underground and the open pit.

The underground mine is expected to produce average grade of 6.2g of gold a ton with open pit ore grading at an average of 3.2g of gold a ton in 2011.

With a rise in production from the underground and phase 2 operations during April 2011, the company expects less than 20% of ore from the low-grade ore stockpiles at an average grade of 1.4g gold a ton.