Inspecting Highwalls

Category	Sub-Category	Title	Made By	Phone #	Video ID	Date Rec'd	Play, min
Ground Control	Inspection	Inspecting Highwalls	MSHA	304-256-3257	DVD500	2004	11

QUESTIONS

1. The six foot rule means: a) never jump more than 6 feet, b) never approach within six feet of the top edge of a highwall without wearing a properly functioning fall arrest system consisting of a harness, shock absorbing lanyard and tied off to an anchor point that will support at least 5000 lbs, c) never get closer than six feet from cracks near the top edge of a highwall without a properly-functioning fall arrest system.

2. The most important tool for highwall safety is: a) common sense, b) a long, boring, annual refresher training class, c) a good game of jeopardy or tic-tac-toe, d) a swift kick in the butt by your boss, e) inspection by a well-trained competent inspector and corrective action.

3. The three main categories in which rocks or masses of material fall from a highwall are: a) toppling, sliding and circular failure, b) rolling, spalling and sliding, c) popouts, erosion, weather

4. Toppling is where a rock or column of rocks will develop fractures or plains of weakness around its perimeter. T__, F__

5. Toppling will generally be preceded by a)signs of separation on the top of a highwall b)dips down toward the pit, c) both.

6. Sliding failure occur when a plain of weakness is exposed which: a) dips down toward the pit, b) dips at right angles to the pit, c) dips away from the pit.

7. The steeper the dip of plains of weakness, the less chance there is of a failure taking place. T__, F__

8. Circular failure usually occurs in a) weak rock, b) spoil, c) soil, d) waste rock, e)other unconsolidated material, f) all are true.

9. Circular failure: a) usually follows a pre-existing fracture plain, b) is shaped like a circular arc, c) is preceded by signs of bulging and cracks or scarfs on top.

10. Time of the year and weather have little or nothing to do with the way a highwall is inspected. T__, F__

Category	Sub-Category	Title	Made By	Phone #	Video ID	Date Rec'd	Play, min
Ground Control	Inspection	Inspecting Highwalls	MSHA	304-256-3257	DVD500	2004	11

ANSWERS

1. The six foot rule means: a) never jump more than 6 feet, b) never approach within six feet of the top edge of a highwall without wearing a properly functioning fall arrest system consisting of a harness, shock absorbing lanyard and tied off to an anchor point that will support at least 5000 lbs, c) never get closer than six feet from cracks near the top edge of a highwall without a properly-functioning fall arrest system.

2. The most important tool for highwall safety is: a) common sense, b) a long, boring, annual refresher training class, c) a good game of jeopardy or tic-tac-toe, d) a swift kick in the butt by your boss, e) inspection by a well-trained competent inspector and corrective action.

3. The three main categories in which rocks or masses of material fall from a highwall are: a) toppling, sliding and circular failure, b) rolling, spalling and sliding, c) popouts, erosion, weather

4. Toppling is where a rock or column of rocks will develop fractures or plains of weakness around its perimeter. T__, F__

5. Toppling will generally be preceded by a)signs of separation on the top of a highwall b)dips down toward the pit, c) both.

6. Sliding failure occur when a plain of weakness is exposed which: a) dips down toward the pit, b) dips at right angles to the pit, c) dips away from the pit.

7. The steeper the dip of plains of weakness, the less chance there is of a failure taking place. T__, F__

8. Circular failure usually occurs in a) weak rock, b) spoil, c) soil, d) waste rock, e)other unconsolidated material, f) all are true.

9. Circular failure: a) usually follows a pre-existing fracture plain, b) is shaped like a circular arc, c) is preceded by signs of bulging and cracks or scarfs on top.

10. Time of the year and weather have little or nothing to do with the way a highwall is inspected. T__, F__