Permafrost by permafrost. Of this area slightly more than half is underlain by continuous permafrost, around 20 percent by discontinuous permafrost, and a little less than 30 percent by sporadic permafrost. Most of this area is found in Siberia, northern Canada, Alaska and Greenland. Beneath the active layer annual temperature swings of permafrost become smaller with depth. The deepest depth of permafrost occurs where geothermal heat maintains a temperature above freezing. Above that bottom limit there may be permafrost, whose temperature doesn't change annually—"isothermal permafrost". Permafrost typically forms in any climate where the mean annual air temperature is less than the
Cempaka diamond mine by LSE-listed Gem Diamonds, started mining operations there in 2005, and in a year had uncovered 50,000 carats of "gem quality" diamonds, it said in a statement. The hundreds hoping for fortune at Indonesia's largest diamond mine http://mashable.com/2015/11/09/campaka-indonesia-diamond-mine/#5XrLagnkdEqk Cempaka diamond mine The Cempaka mine is one of the largest diamond mines in Indonesia and in the world. The mine is located in South Kalimantan, Borneo. The mine has estimated reserves of 32.9 million carats of diamonds. The hundreds hoping for fortune at Indonesia's largest diamond mine 1.2k Share Tweet BY VICTORIA HOSingapore Nov 09, 2015 For the 500 or so