Antilles Gold is participating in the development of two previously explored mineral deposits in Cuba (La Demajagua and Nueva Sabana) to produce gold, silver, antimony and copper, and the exploration of potentially large porphyry copper deposits through its 50:50 joint venture with the Cuban Government’s mining company, GeoMinera SA.
Minera La Victoria SA was registered as a Cuban foreign joint venture mining company in August 2020 to develop the Country’s largest known gold deposit at La Demajagua.
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Summary:
The La Demajagua Project displays the characteristics of a low sulphidation epithermal gold deposit. The geology of the deposit area is dominated by schistose units (quartz-graphite schists, quartz-sericite schists, and quartzites), rich in gold-bearing arsenopyrite, typically metamorphosed to greenschist facies.
The lithologies alternate between packages of graphite rich and relatively graphite poor, with package thickness of 20-200m, though increased graphite content occurs in almost all cases of fault brecciation, and so in turn mineralisation is almost always found with areas of elevated graphite content.
Alteration indicates low temperature formation and occurs as rare bleaching of rocks (only occurring in the vicinity of quartz veins over tens of cm in thickness), pervasive sericitisation, graphitisation, and silicification either as a saturation of the entire rock mass with silica or by the formation of a network of quartz veinlets.
Vein quartz is grey, white-grey or clear and is finely crystalline. Evidence of several episodes of remobilisation can be found in the quartz, and finely disseminated sulphides occur in all areas of silicification and partly outside. Hydrothermal flow is assumed to have been aided by hydraulic pumping from fault movement, with the average sulphide content in the order of 4-6% and increasing up to 15% in enriched areas.
The gold is refractory and primarily held within arsenopyrite and associated with boulangerite. Ore texture is disseminated, laminated, massive, brecciated or forms as a sulphide cement, while its structure is cataclastic, hypidomorphic, grainy or allotriomorphic.
The mineralisation strikes approximately 45 degrees and dips ~70 degrees towards the northwest. The main zone of identified mineralisation extends for ~2.2km along strike and extends from surface to ~400m down dip, though the thickness varies from 3-35m. The mineralisation within this zone is veiny, discontinuous and high grade, with lower grade disseminated mineralisation evident in the surrounding brecciated region. In addition to the main mineralised zone, additional hanging wall and footwall zones have been modelled over a portion of the mineralised zone.