http://b4hntuy3fimfh2227vf4f74emnya7p35i5brtqujs6leqvtclfwvjbqd.onion/doc/physics/diamonds-crookes/The%20Project%20Gutenberg%20eBook%20of%20Diamonds,%20by%20William%20Crookes..html
Paterson, taken from a paper read by him
to the Geologists’ Association, gives a
graphic picture of the early days of the
Kimberley Mine: “The New Rush diggings (as the Kimberley [27] Mine was at first called) are all going
forward in an oval space enclosed around
by the trap dyke, and of which the larger
diameter is about 1000 feet, while the
shorter is not more than 700 feet in length.