CMSP Safety, Health & Risk Management 4 — Questions and Answers
Question 1: Under MSHA Part 48, what is the minimum annual refresher training required for experienced miners?
- 4 hours
- 8 hours (Correct answer)
- 16 hours
- 24 hours
Correct answer: 8 hours
30 CFR Part 48 requires that all miners receive a minimum of 8 hours of annual refresher training regardless of their experience level.
Question 2: Which of the following is an example of an engineering control for managing dust exposure in an underground coal mine?
- Requiring miners to wear N95 respirators
- Installing a water sprayer system on the continuous miner's cutting head (Correct answer)
- Rotating miners to limit individual dust exposure time
- Posting warning signs at high-dust areas
Correct answer: Installing a water sprayer system on the continuous miner's cutting head
Water spray systems mounted on cutting equipment suppress dust at the source, an engineering control that reduces dust generation rather than relying on behavior or PPE.
Question 3: A CMSP candidate is reviewing an incident rate calculation. Which formula correctly computes the OSHA Total Recordable Incident Rate (TRIR)?
- (Number of incidents × 100,000) ÷ Total hours worked
- (Number of incidents × 200,000) ÷ Total hours worked (Correct answer)
- (Number of incidents × 1,000,000) ÷ Total hours worked
- (Number of incidents ÷ Total hours worked) × 100
Correct answer: (Number of incidents × 200,000) ÷ Total hours worked
TRIR = (Number of recordable incidents × 200,000) ÷ Total hours worked, where 200,000 represents the base for 100 full-time employees working 50 weeks × 40 hours.
Question 4: What condition must exist before a miner can exercise the right to refuse work under Section 103(g) of the Mine Act?
- Any condition the miner finds personally uncomfortable
- A condition that could reasonably be expected to cause death or serious physical harm (Correct answer)
- Any MSHA citation issued in the past 30 days
- A condition observed by at least two miners simultaneously
Correct answer: A condition that could reasonably be expected to cause death or serious physical harm
Section 107(a) of the Mine Act allows miners to withdraw from imminent danger areas — conditions where there is a reasonable expectation of death or serious physical harm before the hazard can be eliminated.
Question 5: Which gas is most commonly associated with asphyxiation hazards in confined spaces and abandoned mine areas due to its colorless, odorless nature and displacement of oxygen?
- Carbon monoxide
- Hydrogen sulfide
- Carbon dioxide (Correct answer)
- Methane
Correct answer: Carbon dioxide
Carbon dioxide (CO₂) is heavier than air, colorless, odorless, and displaces oxygen in low-lying areas and enclosed spaces, causing asphyxiation without warning.
Question 6: In conducting a risk assessment for ground control in an underground mine, which factor most directly influences the choice of roof support system?
- The mine's annual production tonnage targets
- The geomechanical properties of the strata and rock mass rating (Correct answer)
- The number of workers assigned to each section
- The proximity to surface infrastructure
Correct answer: The geomechanical properties of the strata and rock mass rating
Rock Mass Rating (RMR), Q-system values, and geomechanical properties (strength, jointing, groundwater) directly determine the required type and density of roof support.
Question 7: Which MSHA standard requires mine operators to develop and follow a written emergency response plan (ERP)?
- 30 CFR Part 46
- 30 CFR Part 75.1502 (Correct answer)
- 30 CFR Part 56.4101
- 30 CFR Part 100
Correct answer: 30 CFR Part 75.1502
30 CFR Part 75.1502 requires underground coal mine operators to have an approved mine emergency evacuation and firefighting program, including a written emergency response plan.
CMSP Safety, Health & Risk Management 4
Under MSHA Part 48, what is the minimum annual refresher training required for experienced miners?