Jericho Diamond Mine Jericho Diamond Mine The Jericho Diamond Mine is a dormant diamond mine located in Canada's Nunavut territory. Jericho is Nunavut’s first and only diamond mine. It is located northeast of Yellowknife, Northwest Territories and is accessible by air all year and by winter road from Yellowknife. The project was mined from 2006 to 2008, and produced of diamonds from of kimberlite mined from the open pit operation. Over $200 million was invested in the development of the Jericho operations including the construction of a per day diamond recovery plant, maintenance facility, fuel farm, and offices and accommodation for 225 personnel.
Permafrost evident from temperature measurements in boreholes in North America and Europe. Typically, the below-ground temperature varies less from season to season than the air temperature, with mean annual temperatures tending to increase with depth as a result of the geothermal crustal gradient. Thus, if the mean annual air temperature is only slightly below , permafrost will form only in spots that are sheltered—usually with a northerly aspect—creating "discontinuous permafrost". Usually, permafrost will remain discontinuous in a climate where the mean annual soil surface temperature is between . In the moist-wintered areas mentioned before, there may not be even discontinuous permafrost