Equipment exhaust & engine / motor heat Ventilation fans Oxidation of sulphides Blasting Rock temperature Auto compression of air

#3 MinePhase I

#3 MinePhase II

#2 Mine

#1 Mine

Mine DStage 1

Mine DStage 2

Block 1

Block 2

Block 3

1.5°C

12.2°C

17.2°C

24.3°C

31.9°C

ROCK TEMPERATURE

34.7°C

Dry Bulb Increase~ 6°C / 1000m

Wet Bulb Increase~ 4°C / 1000m

WBGT Increase~ 4.6°C / 1000m

AUTO COMPRESSION

3100m

2070m

1400m

850m

General name for several medical conditions caused by working in hot areas.

Hyperthermia, an elevated body temperature due to failed thermoregulation, occurs when the body produces or absorbs more heat than it can dissipate.

Caused by prolonged exposure to excessive heat or heat and humidity.

Occurs when heat is combined with hard physical labour, loss of fluids, fatigue, or some medical conditions.

It may lead to heat related illness, disability or even death.

Dehydration Fatigue Lack of

acclimatization Obesity Drug or alcohol use Previous heat

stroke Kidney or heart

disease

Type or amount of clothing

Age (>40 yrs) Some medications (such

as antihistamines, cold medicines, amphetamines)

Exposure to high temperatures while not working

TYPE OF HEAT STRESS

SYMPTOMS

Heat Fatigue Impaired motor skills.

Heat Rash Sweaty skin, red blotches and extreme itchiness, prickling sensation on skin.

Heat Cramps Painful muscle spasms (usually larger muscles), hard painful lumps, sweaty skin.

TYPE OF HEAT STRESS

SYMPTOMS

Heat Exhaustion Headache, nausea, clammy or pale skin, rapid pulse, weakness, thirst and giddiness.

Heat Stroke Unconsciousness (or, if conscious, confused, staggered walk, agitated), hot dry skin or (rarely) sweating, rapid pulse, body temperature of 41 degrees Celsius or higher.

Employers have a duty under section 25(2)(h) of the Occupational Health and Safety Act to take every precaution reasonable in the circumstances for the protection of a worker. This includes developing hot environment policies and procedures to protect workers in hot environments due to hot processes or hot weather.

For compliance purposes, the Ministry of Labour recommends the Threshold Limit Values (TLVs) for Heat Stress and Heat Strain published by the American Conference of Governmental Industrial Hygienists (ACGIH). These values are based on preventing unacclimatized workers' core body temperatures from rising above 38°C.

Developed by the Heat Stress Committee:• the Occupational Health Centre• elected Health and Safety representative• Engineering• an external Occupational Hygiene consultant.

In accordance with the Occupational Health and Safety Act and Regulations for Mines and Mining Plants.

With the objective of ensuring all employees subjected to high temperatures are protected from undue risk associated with the total heat load while maintaining safe production levels.

Applies to:• all property owned by Kidd Mine and Properties under its

jurisdiction• all Kidd Mine Employees, Contractors and Subcontractors

who conduct work in high temperature environments and their supervisors.

Applies to every work place where the estimated Wet Bulb Globe Temperature exceeds 27.5oC called a “high temperature environment”.

Employer Supervisors Ventilation (Engineering) Workers Occupational Health Centre JOHSC

Employer to ensure:• Supervisors and workers are notified of their

responsibilities• Proper training on the hazards of hot environments; • Appropriate resources, procedures, equipment and

materials are provided & maintained to protect the health and safety of all workers;

• All components of the Heat Stress Program are implemented

Supervisory roles have the primary responsibility for controlling access to and authorizing work in high temperature environments.

Supervisors to:• Conduct daily estimated WBGT & determine appropriate

work/rest regimens for their workers;• Complete the High Temperature Work Record, notify

affected workers and complete their Neil George Card and provide this record to the CPCR (control room) at the end of each shift;

• Ensure that workers have been trained in the hazards of working in hot environments;

• Promptly report all known or suspected heat related incidents to the Occupational Health Center; and

• Take every reasonable precaution to protect worker health.

Workers to:• Participate in required departmental training sessions;• Be familiar with high temperature environments hazards;• Use the appropriate equipment and materials and to

follow the work/rest regimen;• Consult their physician on personal risk factors that may

affect heat tolerance;• Be aware that lifestyle factors affect the health effects of

heat stress and modify lifestyle and/or work;• Promptly report any known or suspected heat related

symptoms;• Stop work and report if feeling heat stress-related

symptoms;• Request supervisor to take temperature measurements.

Occupational Health Centre to:• Provide ongoing health education;• Record all heat related incidents as such in the

accident/incident report.

Joint Health & Safety Committee to:• Annually review the Heat Stress Program implementation;• Make recommendations to the employer for

improvement.

Use an instrument capable of determining the WBGT; Weekly measurement taken by ventilation technicians to

determine the actual WBGT where temperatures exceed 26ºC;

Temperatures posted on surface on a weekly basis; Supervisors take daily estimates of the WBGT where

temperatures may exceed 26ºC; If WBGT temperatures are above designated limits, the

supervisor determines the work/rest regimen; This information is recorded on the High Temperature Work

Record, on each worker’s Neil George Card and then provided to CPCR at the end of the shift;

Ventilation technicians record the temperature from the supervisor’s record on to the appropriate map in the WBGT glass cabinets. This information is used to modify the program annually.

Wet Bulb Globe Temperature Index (WBGT)- Measures Human Heat Stress Exposure

Dry Bulb (DB) - Measures Ambient Air Temperature

Wet Bulb (WB) - Measures Cooling Effect of Air Movement

Black Bulb Globe (GT) - Measures Radiant Heat

RH300 Digital Psychrometer by Extech

Carried by all Supervisors

Available through our safety equipment dispensing (vending) machines

Inexpensive & disposable

Should be replaced every 6 months (reduced accuracy)

Determines Wet and Dry Bulb Temperatures

WBGT = 30% Dry Bulb + 70% Wet Bulb

Light: • Equipment operation• Light construction work• Deckman• Electrician terminating

cables Moderate:

• Explosives loading• Installing flexible ducting• Moderate construction work• Installing pipes• Mechanics

Heavy: • Jackleg operation• Heavy construction work• Diamond driller rod pulling• Alimak set up or stripping• Scaling• Installing ground support• Removing electrical wires

Very Heavy:• Shoveling• Manual muck removal

If the job task is not covered in the work classification, the following definitions are used for determining the workload of a job task.

• Light: sitting with moderate arm and leg movement; welding; using small power tools; standing with some walking about.

• Moderate: rapid or forceful arm movements; walking with moderate lifting/pushing; hammering nails; tying rebar

• Heavy: heavy assembly work on a non-continuous basis; intermittent heavy lifting with pushing or pulling; shoveling dry sand; walking slowly upgrade.

• Very heavy: heavy lifting on a continuous basis, walking steadily upgrade.

  Work Demands

 Work / Rest Regimes Light Moderate HeavyVery

Heavy

100% Work 29.9 28.0 -

75% Work 31.0 29.0 27.5 -25% Rest        50% Work 32.0 30.0 29.0 28.050% Rest        25% Work 32.5 31.5 30.5 30.075% Rest        Stop work and correct 32.6 31.6 30.6 30.1

2010

Acclimatization is the ability to work effectively in the heat by gradually getting used to your environment.◦ 20% per day increase for new workers.

Some workers take longer than others to become fully acclimatized (individual factors). ◦ A schedule is in place for becoming acclimatized

After 7 days off of work your resistance to heat decreases and have to be re-acclimatized upon your return.

2010

Lunch should be light and cool. Critical Step: Replace the water and salt that is

lost through sweat. Drink plenty of water throughout the day ( at least 1 Litre per Hour).

Avoid alcohol & caffeine as it dehydrates the body. Water is the best replacement.

A worker may lose up to 7 to 10 litres of water in sweat over one shift.

Water intake must equal the sweat produced. Most workers drink less fluid than needed. Suggested amounts 250 ml every 20 minutes (8L

per day). Ensure the refuge stations are well stocked with

bottled water and encourage workers to drink water.

Monitoring the color of urine is a good way of evaluating your hydration level

2010

An essential aspect of heat stress management is the education and training of all personnel with potential exposure to the underground heat environment;

Kidd Training Programs:• Job Induction – Heat Stress Awareness and Questionnaire• Heat Stress Review• Heat Stress Test• Heat Stress Training for Supervisors• Supervisor Heat Stress Test• Estimated WBGT Procedures for Supervisors• WBGT Meter Test Procedure

A mandatory pre-hire medical surveillance is done for all personnel who are to be assigned to high temperature jobs.

An optional surveillance program is provided for all workers who would like to have heat-related health symptoms identified and/or monitored.

Heat stress incidents are placed in the employee’s medical file.

Temperature monitoring reports and associated work/rest regimes

Heat-related incident/accident reports Training records Medical surveillance records Program review and modification records

2010

Physical discomfort

Irritability and anger

Poor judgment

Slower mental and physical reactions

Diverting attention from the job

Thank you for your attention and I’ll be

pleased to address any comments or questions!