He used an electron microprobe to analyze geological structures called kimberlite pipes — the places you occasionally (but not often) find diamonds — and discovered that the presence of chromite, ilmenite, and high-chrome, low-calcium garnet did indeed predict a rich strike. ❋ By Carl Hoffman (2008)
The diamonds at Kimberley are found in a blue earth, technically known as kimberlite and commonly called "blue ground." ❋ Isaac Frederick Marcosson (1918)
Most diamonds are found near the place where deep Earth processes blasted them to the surface in special rock material called kimberlite (named for Kimberley, South Africa). ❋ Unknown (2010)
A combination of UG bulk sampling and LDD mini-bulk sampling is required to rigorously evaluate such a large kimberlite, which is buried under some 100 metres of glacial overburden.
These are deep, vertical shafts, usually filled with a mixture of rock types, including the diamond-bearing rock called kimberlite (Figure 1). ❋ Unknown (2009)
Meanwhile, the machines used to dig diamonds out of kimberlite ore can have hefty carbon footprints. ❋ Unknown (2010)
It was 1991, and he had found a kimberlite pipe (buried under 30 feet of glaciated sediment) with a concentration of 68 carats per 100 tons — the first Canadian diamonds ever found. ❋ By Carl Hoffman (2008)
He found half a dozen, but like 98 percent of the kimberlite formations in the world, they didn't contain diamonds in commercially viable quantities. ❋ By Carl Hoffman (2008)
(In kimberlite pipes that have gem-quality stones in commercial quantities, a concentration of 1 carat — 0.2 grams — per 100 tons can be profitable.) ❋ By Carl Hoffman (2008)
Superior had worked with Fipke before, back in his gold mining days, so by the time the company wanted someone to go look for kimberlite pipes northwest of Fort Collins, Colorado, Fipke was the best choice. ❋ By Carl Hoffman (2008)
Fipke got a helicopter and flew back and forth over the Arctic Circle, using a magnetometer to track variations in magnetic field that would suggest kimberlite. ❋ By Carl Hoffman (2008)
Miners drill holes in rock faces, insert explosives, and blow out over 1,500 tons of gray kimberlite per blast, twice a day. ❋ Unknown (2008)
Most of the mining is done around Mirny, where there are rich seams of diamond-bearing kimberlite, and where the biggest man-made hole on earth has been gouged. ❋ Shoumatoff, Alex (2008)
But Fipke and Blusson surmised that the indicators De Beers found had in fact been dragged far from the kimberlite pipe eons ago by a passing glacier. ❋ By Carl Hoffman (2008)
Natural diamonds are found in kimberlite of ancient volcanic "pipes," found in South Africa, Arkansas, and elsewhere. ❋ Unknown (2008)
It was reported that specific parts of the Kimberley mines - including the primary kimberlite pipes of Bultfontein, Dutoitspan, De ❋ Unknown (2007)
Kabbah also said the diamond-rich country had discovered iron ore and bauxite deposits as well as new kimberlite (diamond-bearing rock) deposits, which could be the largest in the country. ❋ Unknown (2007)
The diamonds are easily weathered out of their kimberlite host rock and are washed away by streams and rivers. ❋ Unknown (2007)
And you may be surprised to know that buried beneath Saskatchewan soil, just an hour from Prince Albert at Fort a la Corne, is the world's largest known, diamond-bearing kimberlite field. ❋ Unknown (2005)
