Exploration success with Goulamina resource increase

Birimian has announced a substantial upgrade to the mineral resource estimate for the company’s Goulamina Lithium Project (Goulamina or the Project) in southern Mali.

In late April 2018, the company announced a revised mineral resource of 65Mt at 1.43% Li2O, doubling the previously reported mineral resource.

The Dayana Pegamatite system (green), subject of the new inferred mineral resource estimation.
Iamge credit: Birimian

The company reported that drilling was ongoing at the Yando and Danaya pegmatites and that a further update of the Goulamina Mineral Resource would be provided once this work was completed. Drilling has revealed that the Yando and Danaya zones are continuous. As a result, the Yando and Danaya pegmatite zones henceforth will be referred to simply as Danaya.

Resource definition drilling

The resource definition drilling of the Danaya pegmatites was conducted on sections spaced 100m apart, with holes spaced at 50m intervals along the drill lines. A total of 99 reverse circulation (RC) holes, for 11 274m, has been completed, plus three diamond holes with RC pre-collars for an additional 390m.

The drilling programme identified multiple separate, near vertically-dipping spodumene-bearing pegmatite intrusions, all of which remain open to the north and south and at depth. Twelve of the largest pegmatites at Danaya have been investigated to-date, nine of which form the Danaya Mineral Resource, as detailed in this announcement.

Considerable potential exists to further expand the current resource. It seems likely that at least some of the pegmatites intersect or coalesce with the Sangar I or Sangar II pegmatites at their northern extents. All pegmatites drilled remain open to the north, south and at depth.

The depth of weathering at Danaya varies substantially. Several partially-weathered pegmatites outcrop in the central part of the zone, while weathering has been intersected down to a depth of 75m in the northernmost section. Weathered pegmatite has been excluded from the resource estimation because metallurgical test work has yet to be conducted on this material.


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