SOUTHERN AND EASTERN AFRICAN MINERAL CENTRE - SEAMIC

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Geological mapping of Area A Between 2003 and 2004 a consortium of three European companies namely the Norconsult, Norway Geological Survey and British Geological Survey, performed the geological mapping and covered 31 map sheets in Niassa and Cabo Delgado Province. Geological mapping of Area B The Geological Survey of Finland (GTK), ITC and Gondwana consortium undertook the geological mapping of 24 map sheets in Tete Province and parts of Manica, Sofala and Zambézia provinces. Geological mapping of Area C The mapping of the southern region of Mozambique was done by GTK, ITC and Gondwana from 2003 up to 2005 covering 29 map sheets. Geological mapping of Area D The South African Council for Geoscience (CGS) and the National Directorate of Geology of Mozambique (DNG) undertook the geological mapping of 12 map sheets in Nampula, Zambézia and Tete Provinces from 2001 to 2004. Aeromagnetic and Radiometric Survey The historical geophysical data set, from early 1970’s, covering the northern part of Mozambique was conducted by CGG of France. The survey included total magnetic field and total count radiometrics. The second set of airborne geophysical data covering the central zone, which included gamma-ray spectrometric measurements (TC, Th, U, K) was conducted by Hunting Geophysics between 1982 and 83. The data is available at the National Directorate of Geology in digital format. As part of the geological infrastructure development project, regional and detail aeromagnetic and radiometric surveys were conducted by FUGRO on selected areas. The survey details for the regional survey, flown in 2003/04, were as follows: • Line spacing and trend of 1,000 meters at 90o , with gradiometer; • Tie line spacing and trend of 10,000 meters at 180o , with gradiometer; • Sensor clearance: magnetic and radiometric at 100 meters; • Data recorded: magnetic total field horizontal gra- Fig 3: Geophysical data coverage of Mozambique diometry and Gamma Ray Spectrometry; and • Data sampling: magnetic and radiometric at 8.5 meters (0.1 sec). 16
Detailed airborne survey for total magnetic and gamma-ray spectrometric data was acquired in 2004/05 on 6 selected areas. Survey details were as follows • Line spacing and trend of 300 meters at 90 o , with gradiometer • Tie line spacing and trend of 3 000 meters at 000 o , with gradiometer • Sensor clearance: magnetic and radiometric at 80 meters • Data recorded: magnetic total field horizontal gradiometry and Gamma Ray Spectrometry • Data sampling: magnetic 7 meters (0.1 sec) and radiometric at 70 meters (0.1 sec) The digital gridded data set is available at DNG and consists of the following individual data grids in GEOSOFT format, gridded at 250m cell size: * Total field magnetic, reduced to the pole magnetic, calculated vertical gradient, calculated horizontal gradient, analytical signal, IGRF corrected magnetic; * Potassium %, equivalent uranium ppm, equivalent thorium ppm, natural air absorbed rate, uranium/thorium ratio, uranium/potassium ratio, thorium/potassium ratio, digital terrain model; * Line data (Magnetic): Line Number, GPS time, fiducial, date, flight, aircraft registration, GPS latitude/longitude in WGS84 , X / Y co-ordinates in UTM, magnetic raw, residual diurnal correction, magnetic levelled, radar altitude, barometric altitude, terrain elevation and * Line data (Radiometric): Line Number, GPS time, fiducial, date, flight, aircraft registration, interpolated latitude/longitude in WGS84, Interpolated X/Y co-ordinate in UTM, raw total count, raw potassium, raw uranium, raw thorium, processed potassium, processed uranium, processed thorium, radar altitude, barometric altitude, terrain elevation, temperature. Geochemical surveys The first significant geochemical exploration work was carried out by Borches. From 1970 to 1974 geochemical exploration was conducted on a broader scale, mostly by Portuguese and French teams, and by the end of 1974 about 19% of the country had been surveyed at the reconnaissance and regional levels mostly for base metals. Most of the major geochemical surveys carried out at this period were executed by private companies with technical assistance of geologists from the National Institute of Geology of Mozambique. About 270,000 km 2 or 34% of the country was surveyed using various geochemical sampling methods. Most of the geochemical data was available only as hard copy maps and data tables. Original heterogeneous data (methodology, elements, missing results) had to be gathered in order to establish the use of existing information. Maps had to be scanned, georeferenced and digitized which involved considerable amount of manual work. In these surveys only base Fig 4: Status of Geochemical survey of Mozambique (2004) metals have been analysed by AAS. Gold was not analysed. New surveys with multi-element analysis generally cover only small areas. 17
Page 1 and 2: Volume 9, Number 1 December 2006 SS
Page 3 and 4: GEOLOGY AND MINERAL RESOURCES OF ET
Page 5 and 6: Industrial Minerals and Rocks Indus
Page 7 and 8: THE GEOLOGY AND MINERAL RESOURCE PO
Page 9 and 10: Further eruptions accompanied by fa
Page 11 and 12: Carbonatites are known to be host o
Page 13 and 14: Tiomin estimates that it will spend
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Page 21 and 22: New Director General New SEAMIC mem
Page 23 and 24: Attachment During the month of July
Page 25 and 26: Shareholders Agreement Conference T
Page 27 and 28: Southern and Eastern African Minera

SOUTHERN AND EASTERN AFRICAN MINERAL CENTRE - SEAMIC

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