Of the final seven of 20 holes, two returned good results.
Drilling of the known pegmatites within the Cancet project in Quebec, Canada, has successfully doubled the known strike to 1200m.
The latest drilling was headlined by 26m at 1.55% lithium from 5.7m, including 11.3m at 2.45%, with a peak 4m at 3.9% from 8m.
The other promising hole assayed 12m at 1.16% from 3m, including 6m at 1.55%.
The higher grades are in the east, where the ore body remains open.
Significant tantalum mineralisation continues to be intersected in the holes.
Five other holes, while considered promising based on magnetic surveys, did not intersect any significant mineralisation and have been closed out.
Winsome managing director Chris Evans said the company now had a better idea of where to target the drillbit as it looks to generate its maiden resource, and then work to grow its hard rock resources.
He said the results prove Cancet contained "world class levels of lithium" close to surface and were encouraging for future work.
It has an exploration target of 15-25Mt grading 1-2%.
As the weather has warmed, and the snows have melted, it has starting dispatched teams of geologists into the field for the first ever mapping of the Cancet pegmatite swarms to help plot future drilling targets.
They have reportedly already flagged 16 new pegmatitic outcrops since starting work in June.
Stripping programs will also allow it to better see the geometry of the of the main dyke and conduct channel sample over its full width from footwall to hanging wall, along a 600m strike.
The next drilling is tentatively scheduled for November-December.
It will soon put boots on the ground to start examining the Adina claims to the east, where pegmatites were mapped in 2018, and where more are expected to be found.
It expects to start work at the Decelles claims to the south in November, before snowfalls impairs prospecting efforts around early/mid-December.
Winsome raised A$18 million at 20c in November to explore its Cancet, Adina and Sirmac-Clappier hard rock projects in Canada's James Bay area.
Earlier this year it secured claims at Decelles and Mazerac, near the Val d-O'r and Rouyn-Noranda mining centres.
Winsome shares have traded at 18-57c since listing, and were steady today at 20c, valuing it at $29 million.