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
Fucauma Diamond Mine that it planned to restart operations alone. Fucauma Diamond Mine The Fucauma Diamond Mine is a diamond mine under construction in the Lunda Norte Province of Angola. The mine is owned by a consortium of diamond mining companies, the two largest holders being Endiama with 40 percent ownership and Trans Hex with 35% ownership. A feasibility study was done, which included the second phase of bulk sampling and drilling was completed in February 2004. The result of the study was a plan for a US$15 million capital expansion programme, that would lead to a full-scale mining production capacity of 750