Ann: Quarterly Activities Report, page-14

Bizzo does your comment include prior knowledge of this release from the company ?
it is not specified but I suspect they will use sodium di isobutyl xanthate which bonds to sulfhydryl /sulfide groups allowing separation of the ore. Dow 250 is a resin used for fractionation but looks to be used for flotation also. 
im curious to know why copper sulfate is used. For redox? The chloride would allow formation of the auruchloride ion which may make it very easy soluble extract...oh well I'm just an organic chemist not a metallurgical one. 

	treated using Gravity Concentration and Flotation methods;
1	o Testwork shows that 94% and 93.6% gold is recoverable in the Dubbo
2	and Mystery samples respectively using this process;
3	o Only environmentally benign reagents are used to achieve these
4	recovery levels;
5	o Design of pilot plant is underway.
6
7	Testwork Overview
8	Gold at the Talisman Mine is hosted in three major quartz veins, namely, the
9	Maria, Mystery and Crown/Welcome. Of these three the Maria vein is the major
10	contributor containing approximately 91% of the mines 469,000 Oz AuEq Mineral
11	Resource within the Dubbo, Bonanza and Woodstock Zones. The average grade of
12	the resources in these zones is estimated at 22.0g/t, 23.6g/t and 6.3g/t AuEq
13	respectively with some 313,000 Oz lying in the Dubbo Zone. (please see
14	announcement of
15	https://www.asx.com.au/asxpdf/20170905/pdf/43m2d5v2hnybjc.pdf) Exploration in
16	this area has yielded some spectacular results, notably hole BM 37 which
17	yielded 1.8 m @ 656g/t Au and 2080g/t Ag.
18	The Mystery Vein is a newly discovered vein that is highly prospective and a
19	potentially significant contributor to the future of the mine.
20	The metallurgical testwork was designed to deliver reliable and repeatable
21	results which will be used to inform engineering studies and cost estimates
22	both for pilot testwork during the Bulk Sampling Project and to inform design
23	in an updated Pre-Feasibility Study.
24	Testwork examined the processing path, post mining, as illustrated below:
25
26	There are four stages to the metalurgical process once ore has been mined and
27	crushed to a suitable feed size:
28	1) Grinding of ore to a suitable size to liberate gold;
29	2) Recovery of free milling gold in a gravity concentrator
30	3) Flotation of the concentrator tails to recover additional gold
31	4) Final recovery of gold from concentrate
32
33	Processing - Grinding
34
35	An important output from the testwork was to determine the optimal grind size
36	to liberate gold contained in the ore. Grinding (or milling) of ore takes
37	place in a ball mill and is the most expensive and energy intensive part of
38	the process. The finer the grind size required the more energy and time is
39	taken up. Two grind sizes were tested here with ore initially milled to p80
40	passing 106?m and again to p80 passing 53?m.
41
42	Processing - Gravity Concentration
43
44	The milled product was pulped to 50 % solids and the resultant pulp was
45	subjected to gravity concentration via a Knelson Centrifugal Concentrator.
46	The primary concentrate was upgraded via careful hand panning to provide
47	final concentrate mass yield approaching that of operating Knelson
48	installations. Final free gold concentrate (pan concentrate) was assayed via
49	total fusion to eliminate sampling error and nugget effect. Secondary
50	concentrate (pan tailing) and final tailings were dried, weighed and split
51	for Au assay.
52	Results from this show that 61.3% of gold in Dubbo ore, and 81.9% of gold in
53	Mystery ore can be recovered directly through this process.
54	Processing - Flotation
55
56	Tailings from the gravity concentrator were pulped to 20% solids and
57	subjected to single stage flotation with the addition of copper sulphate,
58	sodium isobutyl and Dow 250 which are all environmentally benign reagents.
59	This process resulted in recovery of an additional 32.7% of gold from Dubbo
60	ore and 11.7% from Mystery ore, yielding overall recoveries of 94% and 93.6%
61	respectively. Variance of recovery rates between the two grind sizes was
62	insignificant. This is comparable to the recovery achieved from Talisman ore
63	which has previously been treated using a cyanide leach process. Importantly,
64	the gravity and flotation process will produce inert tailings with low
65	sulphide levels.
66
67	Processing - Gold Recovery
68
69	On exit from the flotation tanks the concentrate can either be sold directly
70	on the market or the gold recovered on a shaker table and smelted.
71	These results are very pleasing with recovery rates nearing those attained
72	from similar tests involving cyanide leaching. Essentially this means that,
73	following pilot testing, the company will be able to use only environmentally
74	benign reagents for gold recovery which supports the company in its goal for
75	the Talisman Mining operation to be a responsible, environmentally
76	sustainable operation.
77	Chief operating officer and principal mining engineer Wayne Chowles said "The
78	results of this testwork provides the necessary hard data with which to
79	proceed with forward planning and takes us an important step closer to
80	realizing the potential of this magnificent orebody