The diamonds at Kimberley are found in a blue earth, technically known as kimberlite and commonly called "blue ground.".    From Wordnik.com.  [An African Adventure] Reference

These are deep, vertical shafts, usually filled with a mixture of rock types, including the diamond-bearing rock called kimberlite (Figure 1).    From Wordnik.com.  [Signs of the Times] Reference

The project is for a kimberlite mine 150 meters (500 feet) deep.    From Wordnik.com.  [ANC Daily News Briefing] Reference

De Beers was the only company mining kimberlite from underground.    From Wordnik.com.  [ANC Daily News Briefing] Reference

There are several old, exposed, and eroded kimberlite pipes in the area.    From Wordnik.com.  [Eli Rabett's Bait and Switch « Climate Audit] Reference

Around the world there are about 6,000 known diamond-bearing kimberlite pipes.    From Wordnik.com.  [The Ekati Diamond Mine - Success in Canada's North] Reference

De Beers is negotiating with the government for prospection rights for kimberlite.    From Wordnik.com.  [ANC Daily News Briefing] Reference

"A37", could be the second or third largest kimberlite discovered in Botswana to date.    From Wordnik.com.  [ANC Daily News Briefing] Reference

The only other kimberlite operation in Angola is the Catoca mine, also in the northeast.    From Wordnik.com.  [ANC Daily News Briefing] Reference

An area in the northern region of the country was investigated for occurrences of kimberlite rock.    From Wordnik.com.  [ANC Daily News Briefing] Reference

Meanwhile, the machines used to dig diamonds out of kimberlite ore can have hefty carbon footprints.    From Wordnik.com.  [Green Lantern: Environmentally friendly jewelry includes synthetic gemstones] Reference

The diamonds came up in very small kimberlite volcanoes that left behind carrot-shaped volcanic pipes.    From Wordnik.com.  [The Ekati Diamond Mine - Success in Canada's North] Reference

Tsodilo says it has found sub-Kalahari sediments that it interprets as the infill to a kimberlite crater.    From Wordnik.com.  [ANC Daily News Briefing] Reference

The diamonds are easily weathered out of their kimberlite host rock and are washed away by streams and rivers.    From Wordnik.com.  [Diamond] Reference

"The real potential is with the discovery and development of kimberlite mines", an Angola-based diamond expert said.    From Wordnik.com.  [ANC Daily News Briefing] Reference

Natural diamonds are found in kimberlite of ancient volcanic "pipes," found in South Africa, Arkansas, and elsewhere.    From Wordnik.com.  [Carbon] Reference

GABORONE, Botswana - De Beers company has received a mining lease for five kimberlite pipes at Martin's Drift close to the.    From Wordnik.com.  [ANC Daily News Briefing] Reference

As reports on the existence of kimberlite pipes filtered throughout the world in the early 1990's, explorers from as far as.    From Wordnik.com.  [ANC Daily News Briefing] Reference

Miners drill holes in rock faces, insert explosives, and blow out over 1,500 tons of gray kimberlite per blast, twice a day.    From Wordnik.com.  [Digging for Diamonds 24/7 Under Frozen Snap Lake] Reference

The company said it found the kimberlite, or diamond producing ore, deposit in Ngamiland in the northwest corner of Botswana.    From Wordnik.com.  [ANC Daily News Briefing] Reference

It was reported that specific parts of the Kimberley mines - including the primary kimberlite pipes of Bultfontein, Dutoitspan, De.    From Wordnik.com.  [ANC Daily News Briefing] Reference

"Six companies are carrying out aerial surveys and are closing in on areas with diamond-loaded kimberlite rock mines," Singh said.    From Wordnik.com.  [It is raining diamonds in Chhattisgarh.Economic hit men(EHM) descend on Chhattisgarh like vultures] Reference

At least two phases of kimberlite are present at CH-31.    From Wordnik.com.  [The Earth Times Online Newspaper] Reference

It has discovered six diamondiferous kimberlite pipes in the same region.    From Wordnik.com.  [The Earth Times Online Newspaper] Reference

Note: All intercepts below the overburden that are not kimberlite are gneiss.    From Wordnik.com.  [The Earth Times Online Newspaper] Reference

The CH-31 kimberlite is located approximately four kilometres southeast of the CH-7 kimberlite.    From Wordnik.com.  [The Earth Times Online Newspaper] Reference

The observed kimberlite is dominantly volcaniclastic with abundant limestone and shale xenoliths.    From Wordnik.com.  [The Earth Times Online Newspaper] Reference

At each of the discoveries, two inclined holes were drilled across the kimberlite from the same setup.    From Wordnik.com.  [The Earth Times Online Newspaper] Reference

At CH-32, the first hole was drilled at an inclination of 45 degrees and intersected magmatic kimberlite only.    From Wordnik.com.  [The Earth Times Online Newspaper] Reference

It is planned that the Lace kimberlite at the - 240m level will be accessed by the decline in the first half of 2011.    From Wordnik.com.  [IOL: News]

In the second hole at CH-32, drilled at an inclination of 65 degrees, both magmatic and volcaniclastic kimberlite were intersected.    From Wordnik.com.  [The Earth Times Online Newspaper] Reference

The project name "Cut 8" refers to the current open pit mine being expanded to facilitate access to the kimberlite ore at a greater depth.    From Wordnik.com.  [FinanzNachrichten.de: Aktuelle Nachrichten] Reference