January 2006 (PDF 2.9 MB) - Barrick Gold Corporation

0DWHULDO 6DIHW\ 'DWD 6KHHW
NOTE: HCN is a decomposition product which may be released in a solid or liquid sodium cyanide spill.
For solid or liquid sodium cyanide spill see MSDS’s for solid or liquid sodium cyanide (3,4).
Immediate action required. Clear area of all unprotected personnel and move upwind. Increase ventilation.
Wearfull protective equipment (see PERSONAL PROTECTION above) to prevent skin and eye contamination
and inhalation of highly toxic hydrogen cyanide gas (liberated upon contact with water).
7. HANDLING AND STORAGE
Storage: Not applicable as hydrogen cyanide is a decomposition product of sodium cyanide.
This material is a Scheduled Poison S7 and must be stored, maintained and used in accordance with the
relevant regulations.
8. EXPOSURE CONTROLS / PERSONAL PROTECTION
National occupational exposure limits
Peak
Limitation/
Ceiling Limit
STEL Carcinogen
Category
10 ppm 11 mg/m3 ’Sk’
Notices
As published by National Occupational Health and Safety Commission (Worksafe Australia).
Exposure Standard (TWA) is the time-weighted average airborne concentration over an eight-hour working day,
for afive-day working week over an entire working life. According to current knowledge this concentration should
neither impair the health or, not cause undue discomfort to, nearly all workers.
Peak limitation - a ceiling concentration which should not be exceeded over a measurement period which should
be as short as possible but not exceeding 15 minutes.
’Sk’ Notice - absorption through the skin may be a significant source of exposure. The exposure standard is
invalidated if such contact should occur.
These Exposure Standards are guides to be used in the control of occupational health hazards. All atmospheric
contamination should be kept to as low a level as is workable. These Exposure Standards should not be used
as fine dividing lines between safe and dangerous concentrations of chemicals. They are not a measure of
relative toxicity.
Engineering measures: Ensure ventilation is adequate to maintain air concentrations below Exposure
Standards. Hydrogen cyanide gas is lighter than air DO NOT enter confined spaces where gas may have
collected. Refer to AS 2865 for requirements for entry to confinedspaces.
Personal protection equipment: Orica Personal Protection Guide No.1, 1998: J - OVERALLS, RUBBER
BOOTS, FACE SHIELD OR AIR MASK, GLOVES (L), APRON.
Avoid all contact. Use with adequate ventilation. Wear polypropylene disposable overalls, elbow-length
impervious gloves, enclosed rubber boots. Wear full-face respirator (Type B2 or B3 gas filter combined with
Class P3 particulate filter) orair supplied mask meeting the requirements of AS 1715 and AS 1716. Always wash
Product name: HYDROGEN CYANIDE GAS Substance Key: 000032505901
Issued: 24.02.2000 Version: 1.0 Page: 4 of 8