PRIMARY GOLD MINERALIZATION IN THE IRON FORMATION OR BIF: CASE OF FOKONTANY MANGATANY, ANDILANATOBY COMMUNE, AMBATONDRAZAKA DISTRICT

Mineral Resource Management

Currently, gold is a rare metal, the most useful in the world. The mineability grade of gold is a decreasing value, but the price is an increasing value in the future. Madagascar has many unidentified gold deposits due to the lack of geological study of the island. Southeast of Mangatany village, there is an active alluvial gold mine operated by local people called Ambatomainty. The gold site is said to be isolated from geological research compared to Maevatanana, Andriamena, Betsiaka, etc. The first part of the work develops the methodological aspects which focus on the field trip. Observation of outcrops shows that there are two structural signatures in the region: a remarkable schistosity and foliation plane in a North-South direction, cut by a recent formation in an East-West direction. The eluvial survey confirms the existence of primary deposits in the region and the XRF result signifies the absence of gold in the BIF of the gold-prone site studied. The metamorphic facies of the study area presents a gold formation of protezoic age or in mica schist which extends for kilometers towards the North and the South. The recognition of the Ambatomainty sector generates the new geological documentation of Alaotra, especially the gold index of the region. In 2010, the alluvial exploitation of gold deposits by local people has already begun to this day. Knowledge of the petrological and geographical characteristics of this gold sector makes it possible to define the specificities of gold, namely the metallogeny of gold, the primary source.

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