Brunswick's 202-metre pegmatite comes back at 1.31% lithium

When we last covered Brunswick, the company had drilled 202.45 metres of spodumene-bearing pegmatite at its Anatacau Main project in Quebec’s James Bay region but had no lab numbers — just a visual guess of roughly 25% spodumene by eye. Now the assays are in. Hole AN-26-15 returned 1.31% Li2O over that full 202.45 metres — lithium oxide, the grade that matters for a hard-rock lithium deposit — including an 85.75-metre core running 1.73%. Two separate pegmatites nearby added 21.5 metres at 1.41% and 9.2 metres at 1.28%. That resolves the promise our last entry carried: the big interval has real grade behind it. The Mirage assays promised in ‘coming weeks’ are not in this release and stay open.

Here is the gram-metre logic — width times grade, the number that tells you how much lithium a hole actually carries. The main hit works out to about 265 percent-Li2O-metres, with 148 of that packed into the high-grade core. For context, that grade sits well above Brunswick’s own Mirage resource, which averages 1.08% Li2O. The spodumene is coarse and the muscovite low, which tends to mean cleaner processing. CEO Killian Charles built this company after a corporate-development career at Osisko Metals and Integra Gold; his background is capital markets, not mine-building, and his personal stake is about 0.15% of the company. The stock tells its own story: BRW rose 78.6% over three months while the lithium benchmark LIT fell 3.7% and base-metals peers rose 8.2%. That move is company-specific, not a sector tide.

Now the honest part. This is one assayed hole. Three of the four Anais holes — roughly 1,700 metres of core — remain pending, so continuity and strike length are unproven. The reported intervals are core lengths; true width is disclosed as a single blanket factor of about 75%, which on 202.45 metres implies roughly 150 metres true width — weaker disclosure than hole-by-hole geometry. A table note warns the interval may contain up to 25% country rock, diluting the headline grade. No cut-off grade or compositing interval is stated. The dyke is interpreted to shallow from sub-vertical to about 45 degrees at depth, which is unconfirmed and affects the true-width math. The release claims the dyke confirms prior hole AN-25-15 between about 216 and 376 metres below surface, but states no inter-hole distance, so how far the zone extends is not given. What to watch: assays from the three remaining Anais holes, further drilling to confirm the dip change, and future metallurgical studies on the Anais mineralization — timing not stated for any.

Public sources: source 1source 2