Regulation 232The manager of a gold processing plant shall in relation to that processing plant ensure that(a) transfer of cyanide from the storage facilities into metallurgical process streams is performed safely and effectively without exposing production personnel, the public or the environment to the possible impacts of cyanide;(b) pumps, pipelines, flanges, valves and gaskets are not constructed of aluminium or aluminium alloys, magnesium or magnesium alloys, brasses and any tinned or galvanized materials in order avoid to the severe corrosion effects of caustic cyanide solution on these materials;(c) flanges on installed pipe work used for conveying cyanide solutions exceeding one percent strength are minimised and where the use of flanges is unavoidable, suitable flange covers are installed;(d) main solution valves are preferably stainless steel ball valves with polytetrafluoroethylene seats and seals;(e) pipelines are stress relieved before installation when heat tracing is performed to avoid the severe corrosion that can occur with heated, caustic cyanide solutions;(f) only gaskets made from clinkerite or red neoprene are used on pump, valve and pipe flange joints;(g) positive displacement pump discharge lines are fitted with a pressure relief valve venting back into the storage tank and the pressure relief system is maintained according to a scheduled maintenance plan;(h) where a ring main feed system is used, the return cyanide solution is discharged back into the same tank feeding the cyanide dosing pump;(i) each cyanide pipeline is inspected routinely and written procedures are established to deal with leaks;(j) each cyanide pipe, including lagged pipes, is painted dark violet at intervals along the entire length of the pipeline;(k) each cyanide pipeline is clearly identified to show whether it carries, calcium or sodium cyanide, and has an arrow indicating the direction of flow;(l) labels and arrows are placed at regular intervals on lagged pipelines;(m) where flake or briquette cyanide are directly transferred to process streams, the area is well ventilated and an audible alarm installed at the discharge point to alert plant personnel before the transfer and the transfer is covered by a specific procedure;(n) manual transfer of flake or briquette cyanide is performed only by a trained, competent person wearing the prescribed cyanide specific personal protection equipment;(o) containers or drums used for transfer remain fully closed until they reach the point of entry into the process streams;(p) discharge points of cyanide into process streams(i) enter at a point which will create the lowest possible risk of exposure to personnel;(ii) are risk assessed and a HCN gas detecting system installed at that point with an audible alarm to alert plant personnel;(iii) enter the process stream at a point where the pH is maintained above 10.5 and which is well ventilated at all times and on-line pH monitoring is conducted including a linked audible alarm to alert personnel if the pH drops below 10.5; and(v) are not close to control rooms or buildings and control rooms or buildings are situated downwind from the discharge points;(q) there is a procedure that governs evacuation from the discharge points of cyanide and the preventive measures to be taken; and(r) acid, acidic solutions or low pH water does not enter at the same point where cyanide is discharged into the process unless it has been properly neutralised up to a pH of at least 10.5.