how were klerksdorp spheres found?
<answer> The 3-Billion-Year-Old Klerksdorp Spheres of Ottosdal. In the small town of Ottosdal, in central North West Province of South Africa, miners working in pyrophyllite mines have been digging up mysterious metal spheres known as Klerksdorp Spheres. <context> The 3-Billion-Year-Old Klerksdorp Spheres of Ottosdal. In the small town of Ottosdal, in central North West Province of South Africa, miners working in pyrophyllite mines have been digging up mysterious metal spheres known as Klerksdorp Spheres. These dark reddish brown, somewhat flattened spheres range in size from less than a centimeter to ten centimeters across, and some of them have three parallel grooves running around the equator.