All over our area (HIGHVELD) you will find these boreholes . Hundreds of them were drilled
They were drilled by mining companies for exploration purposes,in the 50's so the geologists could determain what minarals there are here underground and the quality thereoff.In this case COAL for a big company closeby
If you drive in the country in the winter after the felt fiers you would see a lot of them just be alert to lookout for them
???? When last did you dropped a "klippie" in an old borehole and lissened to the sound as it goes down ???? This is your chance