The work - a phase 3 program - includes a planned 1,500 metres (m) of drilling in nine diamond drill holes to further test for strike continuity of mineralization.
The firm also hopes to improve its understanding of the orientation of the mineralized horizons, and to further define graphite mineralization at the Zone 1 graphite prospect.
The firm added that it was focused on Zone 1 because all 18 holes drilled to date have returned significant graphite intervals.
"Field crews have been on site at Lac Gueret since early February and have been performing detailed structural logging and analysis of previous drill core," said Tom Yingling, president and chief executive.
"This was deemed a critical step to best define how we continue to build on the exciting results from our 2017 drill programs with this next phase of drilling on Zone 1."
During the recently completed 18 hole phase 1 and 2 drill programs on Zone 1 that totalled 2,525 metres, the firm announced it had hit visual graphite in every hole drilled to date.
Earlier this month, the firm increased its footprint at Lac Gueret 25,180 hectares, giving the firm the largest land package in the region.
It came via the acquisition of 1137794 B.C. Ltd, which is a private British Columbia company.
Berkwood Resources shares were unchanged at the time of writing, at C$0.195.