5312/5324 IP Phones User Guide Feature Keys You can use (MENU) on your phone or the Desktop Tool to program the personal keys as feature keys. The Desktop Tool is a browserâbased interface that makes programming quick and easy. For more information on using the Desktop Tool, please contact your System Administrator.312/5324 IP Phones User Guide Feature Keys You can use (MENU) on your phone or the Desktop Tool to program the personal keys as feature keys. The Desktop Tool is a browserâbased interface that makes programming quick and easy. For more information on using the Desktop Tool, please contact your System Administrator.
What is Surface Mining?. Surface mining involves removing the overburden of a mining site to expose the resources below. Overburden consists of the rocks, soil, and mineral deposits that sit over the materials that are to be mined.
Even though that costs even more, an. opencast mining would not be used for that deep excavations and. that process is called âdeep mining. When it comes to design of a mine shaft, there are two options: circular shafts and horizontal shafts (Figure 1, Figure 2). Circular shaft is the most commonly used one. If the shaft should. be deep and shaft diameter is supposed to be more than 4.5 meters, circular shafts are the best choice.