The Use Of Airborne Magnetic Data To Help Quantifying The Magnetite Ore Reserve For The Nooitgedacht Pyroxenite-carbonatite Pipe, South Africa
Event name: 13th SAGA Biennial Conference & Exhibition
Session: Session 7 C – Minerals exploration
Publication date: 06 October 2013
Info: Extended abstract, PDF ( 1.4Mb )
The Nooitgedacht pyroxenite Complex situated in the Crocodile River Fragment consists of a number of intrusions, the youngest a nepheline syenite. Three different type carbonatite intrusives occur in the southern and southwestern parts of the complex with interesting accessory minerals, magnetite, apatite, phlogophite, pyrite, calcite and pyrochlore. To augment an ore reserve estimate of the magnetite a 3-dimensional magnetic model of the complex was calculated with compact volume inversion, using the mapped geology and 3 boreholes as constraints. The amount of magnetite was calculated at 725 million tons, and the pyroxenite-magnetite at 1.9 billion tons. The remaining carbonatite, calcite with very low or no magnetic susceptibility may amount to another 6 billion tons.