113 
usual sampling methods would be apt to miss them. IsTevertheless I 
think that it is preferable to regard the lode primarily as a gold lode, 
and that if a treatment plant should be erected later on it should simply 
he a gold mill of the usual type, with concentrators of the Wilfley or 
Card type to catch any coarse wolfram that may he present. If the 
percentage obtained by these concentrators should justify it, slimers for 
saving fine wolfram could be added. In order to ascertain whether the 
ore presents any difiiculty to this form of treatment, I have had amalga¬ 
mating and cyanide tests made at the Geological Survey laboratory. 
Mr. Bayly^s report, appended hereto, shows a total extraction of 79 per 
cent, by amalgamation and cyanide, the consumption of the latter being 
high. As a preliminary test, however, it must he regarded as quite 
satisfactory; cyanide consumption would most likely be largely reduced 
when handling on the larger scale. 
[13.5.14.] 
Amalgamation and Cyanide Tests. 
The following tests were made by Mr. P. G. W. Bayly at the Geological Survey 
laboratory. 
Repoii, Nos, 104-109. 
Samples—Quartz., &c. 
Locality—Lintons (Bass and Watson’s Mine). 
Sender—H, Herman, Director of Geological Survey. 
Assays {previously reported). 
Field 
No. 
No. 
Gold. 
Silver. 
Bismuth. 
Tungstic Acid 
WO,. 
dwt. gr. 
dwt. gr. 
1 
104 
3 22 
1 
7 
Strong trace 
Nil 
2 
105 
3 22 
1 
7 
Strong trace 
Nil 
3 
106 
2 15 
1 23 
Slight trace 
Nil 
4 
107 
3 22 
2 15 
Strong trace 
Trace 
5 
108 
1 23 
3 14 
Trace 
Trace 
6 
109 
(Ironstone) 
6 12 
5 
6 
Trace 
Nil (Sn. nil) 
Treatment. 
A bulk sample was made by taking equal portions of Nos. 104-108. 
to 60 mesh. 
Assay of bulk :— 
Gold 
Bi. 
WO3 
2 dwt. 15 gr. 
0.13 per cent. 
Trace 
This was crushed 
A. Amalgamation test—- 
Extraction 
1 dwt. 8 gr. = 50 per cent. 
B. Cyanide test— 
Extraction 
Cyanide consumed 
Lime required for acidity 
Time 
1 dwt. 8 gr. = 50 per cent. 
.. 0’31 lb. per ton ore. 
2 lb. per ton of ore. 
.. 24 hours. 
A further experiment was made in which the ore was first amalgamated and then the 
residues treated with cyanide— 
dwt. gr. 
Extracted by amalgamation .. . . 0 22 = 35 per cent. 
Extracted by cyanide (24 hours) .. 1 4 = 44 per cent. 
Total extraction .. .. . . 2 2 = 79 per cent. 
Cyanide consumed 
Lime required 
3 lb. per ton of ore. 
2 lb. per ton of ore. 
