Overman Interview Questions and Answers

The minimum length of underground blasting cable depends on various factors.

• The length of the cable depends on the distance between the blasting site and the control room.

• The type of explosive used and the amount of charge also play a role in determining the cable length.

• Generally, the cable length can range from 100 to 1000 feet.

• It is important to follow local regulations and guidelines when determining the minimum length of underground blasting cable.

The gradient of a haulage road refers to the slope or incline of the road surface.

• The gradient is typically expressed as a percentage or ratio, indicating the rise or fall over a certain distance.

• A steeper gradient means a more challenging road for vehicles to navigate.

• For example, a 10% gradient means the road rises 10 units vertically for every 100 units horizontally.

Safety devices used in dumpers include seat belts, roll-over protection systems, backup alarms, and emergency stop buttons.

• Seat belts to protect the driver in case of sudden stops or accidents

• Roll-over protection systems to prevent the dumper from tipping over

• Backup alarms to alert people around the dumper when it is reversing

• Emergency stop buttons for immediate halting of operations in case of emergencies

Stripping ratio is the amount of waste rock that must be removed to extract a given amount of ore.

• Stripping ratio is calculated by dividing the volume of waste rock by the volume of ore.

• A high stripping ratio indicates that a lot of waste rock must be removed to access a small amount of ore.

• Stripping ratio is an important factor in determining the economic feasibility of a mining operation.