EM 411_Pre Assessment Bonus Quiz 3

Shortwall mining has a panel width of ___________.

• 400 ft

• 120 ft

• 610 ft

• 4000 ft

What are the major considerations in designing longwall mining

• sublevel drifts design

• selection of cutting machine

• barrier pillar design

• panel lay-out design

What are the major factors in selecting cutting machines in longwall mining?

• mining height

• cutting resistance

• seam structure

• the pillar strength

In roof strata classification, this type has no main roof or the thickness of the immediate roof is larger than 4x to 6x the mining height.

• Type V

• Type III

• Type IV

• Type II

AFC in longwall mining is used to ____________.

• Cut the coal seam

• carry the coal from the face

• support the roof remotely

• cut the coal face automatically

In sublevel caving, which of the following is the best location for the footwall drift?

• Hangingwall

• The ore

• Footwall

• Surface

In Grizzly system - block caving method, the grizzly level becomes the _________.

• Undercut level

• Production Level

• Haulage level

• Finger raises

In block caving, which of the following are major considerations in the design?

• Drawpoint Spacing

• limits of the mining panels

• Height of Blocks

• Dilution Control

In block caving, this is the last step before undercut blasting, ensuring the ore to commence caving.

• Stoping

• Undercut BLasting

• Ore Drawing

• Longhole Drilling

Which of the following is not a disadvantage of sublevel caving.

• low ore dilution

• subsidence to the surface

• ore loss can occur

• requires extensive development