
Afghanistan has become the first country whose surface minerals have been mapped from the air.
The US Geological Survey released the results of a "hyperspectral imaging" effort, in which reflections of light from the ground are analysed. Different minerals - as well as snow or vegetation - reflect specific colours, resulting in a "mineral map".
The map comprises more than 800 million data points corresponding to an area of 440,000 sq km, some 70% of the country. In a series of 28 flights over 43 days, the USGS gathered the data from a height of 15,000m, using a camera to capture sunlight reflected from the ground. Each "pixel" of the camera was analysed and correlated with the materials that reflect at a given colour. The USGS public release of the data includes two maps: one of iron and iron-bearing minerals, and one of minerals principally containing carbon, silicon, or sulphur.
But it remains to pin down which economically viable minerals are where, an effort for which the USGS's hyperspectral imaging expertise was enlisted. Afghanistan is known to have vast reserves of oil, gas, copper, cobalt, gold and lithium. In 2010, the Afghan ministry of mines claimed a value of its reserves of nearly a trillion dollars, then carrying out tours to promote investment in them. In late 2011, a consortium of Indian companies inked a deal to begin mining some of the country's large stores of iron.
Source: BBC



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