A collection of maps regarding several operations during the Vietnam War.2nd battalion royal australian regiment, 1st battalion the royal newzealand infantry regiment, anzac, anzac battalion, south vietna, south vietnam, operation barossa, operation darwin, operation geraldton, operation paddington, operation cairns, operation atherton, operation ainslie, operation kenmore, operation santa fe, operation canungra, operation lawley, operation forrest, operation duntroon, operation coburg, operation oakleigh, operation pinnaroo, operation ashgrove tram, operation toan thang, phuoc tuy province

Wooden model of a cyanide plant. A cyanide plant was used for dissolving gold from finely divided ores by means of dilute solutions of sodium or potassium cyanides. The model has five metal bins, there is some rust on the bins and scorch mark on the wooden base.mining, equipment, cyanide plant, gold cyanidation (also known as the cyanide process or the macarthur-forrest process) is a hydrometallurgical technique for extracting gold from low-grade ore by converting the gold to a water-soluble coordination complex. it is the most commonly used leaching process for gold extraction. the ore is comminuted using grinding machinery. depending on the ore, it is sometimes further concentrated by froth flotation or by centrifugal (gravity) concentration. water is added to produce a slurry or pulp. the basic ore slurry can be combined with a solution of sodium cyanide or potassium cyanide, however many operations utilize calcium cyanide, which is more cost effective. to prevent the creation of toxic hydrogen cyanide during processing, slaked lime (calcium hydroxide) or soda (sodium hydroxide) is added to the extracting solution to ensure that the acidity during cyanidation is maintained over ph 10.5 - strongly basic. lead nitrate can improve gold leaching speed and quantity recovered, particularly in processing partially oxidized ores.

A black and white photograph of 161 (Indep) Recce flight Officers, in a playful mood. Standing (L to R) Lt Ross Hutchinson (RW), Lt Kev Peacock (RW & FW), 2Lt Peter Garton (FW), 2Lt Don Trick (Operations), 2Lt Blair Weaver (RW), 2Lt Mike Meehan (RW), 2Lt Ross Goldspink (RW). 2Lt Dave McFerran (FW), Sitting (L to R) 2Lt Tom "Rockets" Guivarra MID (FW), Capt Bernie Forrest (Sect. Comd FW), Capt Phil Roberts (2IC), Maj George Constable (O.C.)(FW & RW)(Kia) Capt Peter Robinson (Engr. Officer) Capt John Coggin DFC (RW), 2Lt Adam Frisch (RW). Note (FW = Fixed Wing and RW = Rotary Wingphotograph, 161 recon flt, lt ross hutchinson, lt kev peacock, 2lt peter garton, 2lt don trick, 2lt blair weaver, 2lt mike meehan, 2lt ross goldspink, 2lt dave mcferran, 2lt tom "rockets" guivarra, capt bernie forrest, capt phil roberts, maj george constable, capt peter robinson, capt john coggin, 2lt adam frisch, gibbons collection catalogue

A black and white photograph of Capt Bernie Forest in his 161 (Indep) Recce Flt 'Possum' Cessna aircraft is directed to a parking bay by a member of the unit's ground staff, following an extended mission over the jungles of Phuoc Tuy searching for signs of NVA/VietCong operations.photograph, capt bernie forrest, 161 recon flt, phuoc tuy, nva/vc, gibbons collection catalogue