Ever since humans realized the intrinsic value of gold, we've constantly searched for - and perfected - ways to find more.
From early methods like panning and trenching, to lode prospectors hunting for rock outcrops and veins, to the invention of drill bits...
In modern times, we use increasingly sophisticated tools and techniques, such as seismic sensors, magnetometry, and gravimetrics to help locate potential gold deposits.
But, after thousands of years of digging for gold, the low-hanging fruit's already been picked. Most remaining deposits are becoming increasingly difficult to find, and increasingly low grade.
Now, a surprising, brand-new gold prospecting tool may be in the offing - one that's far less technologically demanding, and much less invasive.
It seems nature itself has found a way to extract gold from the ground.