THE BISIE TIN PROJECT SUMMARY
The Bisie Tin Project (95% owned through Alphamin’s DRC registered subsidiary, ABM SA, and 5% owned by the DRC Government) contains two exceptional high grade tin deposits, Mpama North and Mpama South located on its mining licence, PE13155, within the Walikale District roughly 180km west-northwest of the regional centre of Goma in the North Kivu Province. Both Mpama North and Mpama South cover 1.5km of a 14km long ridge which borders on younger tin-bearing granitic intrusions to the west. In addition, a number of significant soil geochemical anomalies have been defined along the full extent of the ridge.
Location of the Alphamin Licences
Since drilling commenced in July 2012, the Company has drilled 207 holes for 36,820m at Mpama North and 19 holes for 3,364m at Mpama South. Initial focus was at Mpama North where the Indicated Mineral Resource of 3.94 million tons at 3.94% Sn for 155,300 tons of contained tin and an Inferred Mineral Resource of 0.84 million tons at 4.64% Sn for 38,900 tons of contained tin represents a 30% increase on the Indicated category announced in March 2015. The updated NI 43-101 report will be filed in December 2015.
Definitive feasibility studies have commenced at Mpama North with signed off NI 43-101 documentation expected on 5th February 2016.
Mineralization at Mpama North is focused within two parallel high grade chutes that plunge approximately 25° to the north over approximately 700 m in the down plunge direction. Mineralisation occurs as several narrow veins, blocks or disseminations of cassiterite hosted in a chlorite schist. The Main zone of mineralisation generally occurs over thicknesses of between 2m and 22m with an average thickness of approximately 9m with narrow zones of discontinuous mineralisation developed in the hanging wall and footwall. The hanging wall zone occurs between 4m and 20m above the main zone while the footwall zone occurs between 2m and 12m below the Main zone. Tin mineralisation is strongly associated with copper which was introduced in late stage fractures at Mpama North.
Tin mineralisation at Bisie is unique in its abundance of “wood tin” thought to be a result of compositional layering due to variations in the iron content within cassiterite veins. The maximum cassiterite vein thickness recorded to date is 1.8m with veins of 40-80cm thickness being common within the high grade chutes.
Mineralisation at Mpama North has a tabular geometry shown in section and has a strong structural control with tin bearing fluids potentially sourced from adjacent tin bearing granites.
Highly significant results reported to date and included in the Mineral Resource at Mpama North include:
- 11.5m @ 12.29% Sn from 304m in BGC062
- 11m @ 13.4% Sn from 427m in BGC072
- 13.6m @ 7.59% Sn from 534.4m in BGC140
- 21.7m @ 7.44%Sn from 300m, including 5.2m @ 15.75% Sn from 315.5m in BGC127
- 18.4m @ 6.6% Sn from 122.6m in BGC092
- 13m @ 5.76% Sn from 386m, including 5.5m @ 7.47% Sn from 388.5m in BGC130
The updated Mineral Resource at Mpama North is comprised of an Indicated Resource of 3.94 million tonnes @ 3.94% Sn for 155,300 tonnes contained tin using a 0.5% Sn cut-off which represents 30% increase in contained tin since March 2015 and an Inferred Resource of 0.84 million tonnes @ 4.64% Sn for 38,900 tonnes contained tin using a 0.5% Sn cut-off which represents a 9% decrease in contained tin since March 2015. The top 50m of the deposit has been depleted by artisanal mining and any mineralisation remaining in the area was not included in the Mineral Resource.
The robust and high grade nature of the orebody shows that should the Mineral Resource be reported at a 2% Sn cut-off grade, it decreases to 2.54 million tonnes @ 5.43% Sn for 138,000 tonnes contained tin in the Indicated Category and 0.63 million tonnes @ 5.80% Sn for 36,500 tonnes contained tin in the Inferred Category.
Mpama North Mineral Resource
|Resource||Cut-off grade (Sn%)||Tonnes (Millions)||Sn (%)||Sn Tonnes (Thousands)||Cu(%)||Zn(%)||Pb(%)|
Limited drilling has been carried out at Mpama South where tin mineralization is focused within a chlorite altered unit similar to that at Mpama North and appears to have a similar high grade plunging chute geometry. Two discrete zones of mineralization were intersected at Mpama South: a high grade zinc, lead and silver zone in the hanging wall and sometimes coincident with the underlying tin, copper zone. A best result of 32.8m at 2.46% Sn from 192.2m was reported from BGH011 whereas best base and precious metal results included 19m @ 197g/t Ag , 17.7m @ 14.11% Zn and 14.75m @ 10.82% Pb from 61m in BGH001.
The Company will commence an initial resource drilling programme in early 2016.
Soil sampling programmes have been completed over 14km of the Bisie ridge including Mpama North and South. Distinct and coherent tin (laboratory) and copper, arsenic, zinc and lead (Niton XRF) anomalies have been defined over the full extent of the ridge. The Company has plans to initiate a ground EM survey to better define the source of these anomalies for future follow up with drilling.
Mr. J.C. Witley (BSc Hons, M.Sc.) is a Principal Mineral Resource Consultant for The MSA Group,an independent geological consulting companyto Alphamin, and a “Qualified Person” as defined in National Instrument 43-101 Standards of Disclosure of Mineral Projects. Mr Witley has reviewed and approved the scientific and technical information relating to Mineral Resources and Geology contained in this page.