High grade drill results at the Goulamina deposit
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- Diamond drilling confirms robust depth extensions at West Zone and Main Zone
- Continuous high grade lithium mineralisation regularly intersected to depths of approximately 200m down dip, including
- 38m @ 1.81 % Li2O from 116m
- 31m @ 1.82 % Li2O from 156m
- 19m @ 1.76 % Li2O from 163m
- 14m @ 1.81%Li2O from 127m
- 33m @ 1.99% Li2O from 174m
- 30m @ 1.56 % Li2O from 125m
- Additional wide and high grade Reverse Circulation (RC) drill intersections from extensional and infill drilling at Main Zone
- Current phase of diamond drilling now complete, with rig to be mobilised at Massigui Gold Project
- Mineral Resource update anticipated in March 2017
- Pre-feasibility study on track for June 2017 quarter
Birimian Limited (ASX:BGS; “Birimian” and “Company”) is pleased to announce additional high grade drill results at the Goulamina deposit within its 100%-owned Bougouni Lithium Project (“Project”), southern Mali (Figure 1).
With a current Mineral Resource at Goulamina of 15.5 Mt @ 1.48 % Li2O, for 229,000 tonnes of contained Li2O, the deposit is among the highest grade lithium deposits of significant size globally.
The aim of the current drilling program is to expand the existing resource and enable upgrades to resource classifications for detailed feasibility assessments. In total, 90 holes for 11,483 metres of drilling have been completed in this phase of work and results so far indicate the program is achieving its aim. A revised Mineral Resource is anticipated later this month.
The diamond rig has now mobilized to the Company’s Massigui Gold Project to commence testing high potential gold targets at Koting Prospect.
Depth Extensions Confirmed
Results have now been received for a further 24 drill holes, comprising 14 diamond holes and 10 RC holes.
Diamond drilling results have confirmed the robust continuation of pegmatite mineralisation at depth on Main and West Zone, with strong grades regularly intersected at nominal depths in excess of 200m down dip. Results include
- 38m @ 1.81 % Li2O from 116m (GMRC043D)
- 31m @ 1.82 % Li2O from 156m (GMRC044D)
- 19m @ 1.76 % Li2O from 163m (GMRC045D)
- 20m @ 1.65 % Li2O from 144m (GMRC046D)
- 14m @ 1.81%Li2O from 127m (GMRC035D)
- 33m @ 1.99% Li2O from 174m (GMRC050D)
- 30m @ 1.56 % Li2O from 125m (GMRC051D)
Assays from RC drilling targeting infill areas and southern extensions to Main Zone continue to return positive results, which broadly support and confirm the geological model in this area,
- 29m @ 1.66%Li2O from 119m (GMRC089)
- 49m @ 1.47% Li2O from 23m (GMRC095)
- 38m @ 1.66 % Li2O from 20m (GMRC097)
- 44m @ 1.59 % Li2O from 42m (GMRC098)
- 42m @ 1.61 % Li2O from 5m (GMRC099)
- 22m @ 1.51 % Li2O from 30m (GMRC100)
These results, in addition to the exciting new discovery of a third mineralised trend at Sangar Zone (ASX: 27 February 2017), provide further encouragement for expanding the project resource base in the near term.
Approximately 42 holes are pending return of assay results. These holes are largely from 25m spaced infill sections that increase data density to improve resource confidence and facilitate upgrading resource categories. Geological logging of these holes strongly supports the existing model; significant results will be reported as they come to hand.
The Company expects to be able to provide an interim resource update before the end of March. It is expected this update will broadly capture resource extensions from West Zone and the new discovery at Sangar Zone. Given the relatively steady progress with drilling and the extended time required for assay to be returned, a further update to the resource model is now anticipated by the start of May. This estimate is expected to include all results from infill drilling to support significant resource category upgrades and facilitate ongoing Pre-Feasibility Studies.
On 30 January 2017, Birimian announced that the Scoping Study for the Bougouni Lithium Project had confirmed the outstanding potential of the Project, leading to the decision to commence a Pre‐Feasibility Study (PFS). Scoping Study results suggest that the Goulamina deposit will be amenable to low cost, open pit mining and staged processing plant development; benefiting from low mining strip ratios, high grade at surface mineralisation, and the low cost operating environment in Mali. The PFS remains on track to be completed during the June 2017 quarter.
Figure 1. Goulamina Deposit. Plan view of lithium pegmatite with drill hole locations and reported drill intersections (red). Infill drilling intersections are excluded.
In parallel with resource estimation, Birimian continues to advance a number of studies as it works towards completion of the PFS. Como Engineers are undertaking the next phase PFS processing engineering and flow sheet design. The Company believes there is potential to enhance the Project economics by:
- Optimising open pit mine designs
- Improving flowsheet design through the various PFS test work studies
- Further detailed analysis of transport and logistics options
- Definition of additional high grade mineralisation
Drilling will pause briefly while the company undertakes resource estimation work and other resource related technical studies. The Company's strategy remains to expedite development of the currently defined resources at the Bougouni Project in lieu of targeting major resource expansions by drilling. The next phase of development drilling is currently being planned. This program will be designed to:
- Further upgrade resource categories
- Confirm geotechnical parameters for open pit mine planning
- Confirm plant, associated infrastructure, waste dump and Tailings Storage Facility locations
The Company’s environmental consultants are currently on site undertaking the next phase of detailed sustainability studies at the Project and in the broader community, which will facilitate some of the engineering studies defined above.
Birimian is seeking to fast-track commercialisation of Bougouni. As such, the next key milestones to look forward to are the metallurgical test work and an upgraded resource estimate, both of which are expected to be completed in the current quarter. Following this, the PFS is expected to be completed in the June 2017 quarter, which will enable the Company to progress project financing and offtake arrangements, subject to a positive PFS result.
For further information contact:
Mr Kevin Joyce
08 9286 3045