Permafrost - A thermal condition where ground material stays at or below 0°C for two or more years.

 

Portal Intake - The surface entrance to a drift, tunnel, adit, or entry.

 

Preliminary Assessment Study -The initial stage of the feasibility study in which the accuracy of the factors involved such as costs and revenues is ±25%.

 

Probable Mineral Reserve - The economically mineable part of an Indicated, and in some circumstances a Measured Mineral Resource demonstrated by at least a Preliminary Feasibility Study. This study must include adequate information on mining, processing, metallurgical, economic, and other relevant factors that demonstrate, at the time of reporting, that economic extraction can be justified.

 

Proven Mineral Reserve - The economically mineable part of a Measured Mineral Resource demonstrated by at least a Preliminary Feasibility Study. This Study must include adequate information on mining, processing, metallurgical, economic, and other relevant factors that demonstrate, at the time of reporting, that economic extraction is justified.