Exploration - West Africa - Volcanic exploration continues unabated

Volcanic Gold’s drilling at the Mandiana Project in Guinea intersected broad mineralised intervals including 68m at 2.01 grams per tonne of gold (g/t Au) and 14m at 2.73g/t Au.

Location: Guinea
Resource: Gold

Volcanic map
Regional geological map of West Africa.

To date, Volcanic has completed almost 3 000m of reverse circulation (RC) and diamond drilling, and over 15 000m of air-core drilling at Mandiana and at lands recently optioned from West African Mining Associates (WAMA). The drilling resulted in the expansion of the strike potential of the Yagbelen Resource at Mandiana by about 1 000m, and its lateral potential by more than 500m.

RC and diamond drilling were completed within, and in the immediate surroundings of the inferred mineral resource at Yagbelen, previously defined by Sovereign Mines of Africa. The RC and diamond drilling also allowed Volcanic to gather extremely valuable information on the geological controls on mineralisation. Based on work completed to date, gold mineralisation is seen to occur preferentially in a series of bedded sandstone units. The units are repeated in all holes, and their characteristics will serve as a key targeting tool in Volcanic’s forthcoming resource drilling programme.

The company reports that air-core drilling has been successfully deployed in identifying extensions to the north, east, and south of the Yagbelen, where it has defined a further 1 000m of strike potential. Initial air-core results clearly illustrate the strike continuation of a strongly anomalous feature extending 500m to both the north and the south of the resource, as well as laterally, 500m to its east.

Air-core drilling was performed in grid-like fashion on a series of ‘fences’ established at 100–200m intervals, along which inclined holes have been drilled at 40–50m spacings. This rapid, low-cost approach to exploration has been designed to provide detailed and accurate information on near-term resource targets. The air-core drilling is ongoing.

In January 2017, Volcanic acquired an indirect 75% interest in Guinean entity, Guiord SA, which owns 100% of the Mandiana Project in Guinea. The remaining 25% interest in the Mandiana Project is held by SOGUIPAMI, a Guinean government-owned business entity formed to conduct mineral exploration projects. In April 2017, Volcanic entered into a binding letter agreement to acquire 80% of WAMA — a private Guinean company — the landholdings of which together adjoin the entire length of the southern boundary of Mandiana, and lie within the same mineralised trends as the project.

The Mandiana and WAMA projects are underlain by geology comparable to that of many other Birimian-age volcano-sedimentary sequences in West Africa, in which gold mineralisation typically exhibits a strong relationship with major structural and hydrothermal zones. At both the Mandiana and WAMA projects, the gold mineralisation associates with a network of quartz veins that appear to relate to such zones, and is located at major lithological and structural breaks. In the near vicinity, and of very similar geological character, is AngloGold Ashanti’s Siguiri Gold Mine (measured and indicated resources of 3.37Moz Au and inferred resources of 2.14Moz Au). Other significant gold deposits and mines in the neighbouring area include Hummingbird Resources’ Yanfolila project, Avnel’s Kalana property, and Avocent’s Tri-K project.

Of key importance at the Mandiana and WAMA projects is the presence of shallow but extensive artisanal workings in the project area, which are seen to follow the north–south mineralised trend common in known deposits in the vicinity. Limited drilling beneath such workings by both Sovereign and WAMA in their respective properties led to the identification of bedrock gold mineralisation. Many kilometres of artisanal workings on these trends remain to be drill tested.

Click below to read the September/October 2017 issue of African Mining

AM SeptOct2017

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