But the precious metal is not just underground, it's also in the "tailings" - heaps of grey-white residue left behind by old mining activity.
While the materials and construction methods are similar to standard pylons, one point of departure is the colour - white instead of gun-metal grey.
Among the non-epileptic children, brain activity in an area called the cortex increased when the contrast in the flicker was 20% - the difference between grey and white.
According to the numbers, almost two-thirds of those with white hair and more than fifty percent of the grey-headed claimed to have a six-month emergency savings fund.
He is described as Asian with short dark hair, wearing a grey T-shirt, black trousers and white shoes.
He was wearing a light grey V-neck woollen jumper with a white T-shirt underneath, black baggy jeans and dark shoes.
Etch A Sketch, with its familiar red-frame, grey screen and two white dials, allows children to draw something and shake it away to start again.
Now, this journey is a testament not just to you as individuals, but also to the families that surround you, because your journey began long before you got that first military haircut and put on white-over-grey.
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He is now employing a vision test used by the US Air Force which checks the ability to discriminate between white, black and grey - the lack of which is another symptom often seen in chronic ciguatera.
Before serving in a variety of executive roles at Netscape, AOL and Shutterfly, Grey scouted for the Chicago White Sox in the mid-1990s.
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The glossy stripe from the original white or grey One X has gone, and -- if it's possible -- the plastic feels slightly softer and classier.
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Grey, who won an Oscar as the menacing, white-faced master of ceremony, recalls attending a screening of the new blockbuster "Les Miserables" and immediately being asked questions.
Down on the bustling banks of the Niger in the port of Mopti - the Venice of Mali as the faded tourist posters call it - I find stacks of square white slabs flecked with grey.
As they age, the heads and legs become white and the fleece assumes a colour ranging from blue-grey to light grey.
It propelled its hulking frame out of the battleship-grey waters and twisted through the air, before crashing back into the white surf.
The E71 should arrive in the States -- and yes, with full 3G US bands -- sometime Q3 of this year, and will be available in grey steel and white steel.
The idea of a black-and-white regulation sounds good, but any kind of litigation goes into the grey area because no one knows where the line really is.
Before a decision could be made about how to handle the three self-stickered gents, the situation was complicated by a handsome grey-haired woman at the front of the balcony rising to her feet and applying a white patch to her mouth.
He was wearing a grey hooded top that had lime green laces and front pocket, black shell-type tracksuit bottoms and white trainers.
If you like sleek, minimalist hotel design, you will love the 156-room, five-star Sofitel Vienna Stephansdom, where rooms are decorated entirely in just three colours: white, grey or black.
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