India using NASA’S Mars tech to find Earth metals

NEWDELHI: An advanced remotesensing technology developed by US space agency NASA to map minerals on the moon and Mars is being used in India for the first time to prospect for gold, diamonds, platinum and rare earth elements.

Rare earth metals are a group of 17 elements with many similar properties and are often found together in geologic deposits. They’re in high demand across the world because of their use in high technology devices such as smart phones, digital cameras, computer hard disks, fluorescent and light-emitting-diode (LED) lights and computer monitors, among others.

“In its pursuit for minerals, the GSI is going to use ultra-modern remote sensing technology to find lead, zinc, copper, gold, diamond and platinum, among others. This will be used for the first time in India,” Dinesh Gupta, director general, Geological Survey of India (GSI).

“Rare earth metals such as lanthanum, cerium, holmium and lutetium among others are a group of 17 elements, which have chemical similarities. They are not rare at all. They are called “rare” because it is unusual to find them in a pure form,” Gupta said. China has almost 40% of the world’s known reserves of rare earth metals, but because most of the reserves are untapped (or are not viable to tap) it produces almost 80% of rare earth metals sold every year. Called Advanced Visible Infra-red Imaging Spectrometer-next Generation (AVIRIS-NG), the sensor-based technology that will now be used in India has been proved effective for mapping surface mineralogy on earth, the moon and Mars.

“AVIRIS-NG is being used by Australia, USA, Canada and South Africa,” said Gupta. The AVIRIS-NG sensor was mounted on an ISRO aircraft to get hyperspectral images of 14 mineralised blocks across India, including in Jhagadia in Gujarat, Udaipur in Rajasthan, Chhatarpur in Madhya Pradesh and Kuhikhobna in Maharashtra, among others. GSI signed a MOU with the National Remote Sensing Centre (NRSC), a wing of the Indian Space Research Organisation (ISRO), on September 5, to analyse data to trace the minerals from the hyperspectral images taken by ISRO in three phases – October to November 2015, January to February 2016, and April to May 2018. “Over the next three years, scientists from the GSI and NRSC-ISRO will analyse the airborne hyperspectral data to look for surface signatures of mineralisation in those 14 promising areas,” he said.