Alphamin Resources Corp. a producer of 4% of the world’s mined tin1 from its high-grade operation in the Democratic Republic of Congo, has announced drill results from its Bisie Tin Complex.
Mpama South drilling update
Mpama South is the high-grade tin resource adjoining the southern end of Alphamin’s operating Mpama North mine. Resource definition drilling commenced on the project in December 2020 and a maiden Mineral Resource was announced effective 24th February 2022 of 0.83Mt @ 2.58% Sn Indicated Mineral Resources and 1.95Mt @ 2.52% Sn Inferred Mineral Resources based on 79 drillholes for 23,109 metres.
By mid-March 2022, 33,556 metres and an additional 47 drillholes outside of the maiden resource had been completed. This additional ~10,000 metres of expansionary drilling and ongoing infill drilling will be progressively included in Mineral Resource estimation update exercises as assays are received on each batch every 4-8 weeks.
The first update to the maiden Mineral Resource will include 23 additional drillholes comprising the results in this release. The first resource update may be as soon as end March/ early April 2022. Mineralisation still remains open in multiple directions at Mpama South and management are confident in the development project’s on-going growth prospects.
Mpama North Drilling Update
Expansion drilling commenced on the Mpama North Mine in July 2021, starting with the Mpama North Deeps target. The first drillholes showed increased structural complexity associated with a cross-cutting fault limiting the extents of the target. However, several thick and high-grade intercepts of visual cassiterite were intersected at the Deeps target between this cross-cutting fault and the deepest intercepts from the 2015 drilling, extending known mineralisation along strike northwards.
Drilling on a shallow second target termed Oso immediately north along strike of the Mpama North mine was also commenced successfully, intercepting promising though thinner zones of visual cassiterite mineralisation, which importantly, are at the same elevation to existing mining levels and within a short distance to already completed underground development.
Both visual and assayed thick high grade tin intercepts at the Deeps target provide significant opportunity for Alphamin. The process plant has a targeted feed grade of ~4.0% Sn, and the very high grade mineralisation intercepted in the Deeps area can be in excess of 20% Sn. This material will need to be blended with substantial quantities of low-grade material to achieve the target plant feed grade.
Opportunities exist for the Mpama North mine to add production from previously unmined lower grade blocks to the mining schedule and potentially add other low-grade areas to the resource, ultimately extending mine life and maintaining a steady feed grade at the operation.
Drilling continues in 2022 to evaluate the Deeps and Oso targets in 1H 2022, and will commence on the down dip eastern target of Mpama North too in May 2022 which still remains open and untested. The most significant intercept from the recently received batches of drillhole assays is MND019 in the Deeps target and is listed below as an apparent width.