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The STUDIA UNIVERSITATIS BABEŞ-BOLYAI issue article summary
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Abstract: A number of applied mineralogy and exploration techniques have been used in the exploration and development of the Roşia Montană Gold deposit, Roşia Montană, Romania. The deposit is situated within the Apuseni Mountains region, approximately 65 kilometres west of the regional centre of Alba-Iulia and has been the focus of ongoing gold exploitation for over 2000 years (Fig. 1).
The exploration and development of the deposit has included the collection of 92,359 metres of drill samples from 695 underground and surface drill holes, including 28,439 metres of diamond drilling and 63,920 metres of reverse circulation drilling, in addition to 59,584 metres of underground channel sampling from the more than 140 kilometres of known underground development at Roşia Montană. These samples and underground access formed the source for much of the applied mineralogy and exploration techniques conducted.
The exploration program has included mineralogical studies on thin and polished sections. The use of fluid inclusion studies, XRD and microprobe analysis has also been applied to assist in the program. The geology and alteration, as well as structural setting have been modelled utilising Vulcan three-dimensional software. The same software has been used for the development of the resource estimation model and subsequent reserve model. The resource model has been calculated using ordinary kriging, multiple indicator kriging, inverse distance squared, and nearest neighbour techniques using 10 x 10m, 15 x 15 m and 20 x 20 x 10 m block sizes. The model and linked databases, using AcQuire and Micromine databases, also include all geological characteristics, geotechnical properties, metallurgical properties including recoveries, geophysical properties including hardness and abrasiveness, and geochemical properties including sulphur, sulphate and analysis of up to 47 elements, as well as the ABA and ARD properties of all rock types linked to the known mineralogy and geology.
The databases and models enable Roşia Montană Gold Corporation to know and understand the geology, mineralogy as well as the geochemical and geophysical characteristics of every block and thus rock type in the deposit. |
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