358 A, LIVERSIDGE. 
‘The loose easily removed scale of a second lot of sheathing from 
Circular Quay was assayed, but was first roasted and then extracted 
with pure sulphuric acid before scorification and cupellation. As 
will be seen from the results, this scale was richer in silver, the 
gold was very irregular, and was found to contain platinum derived 
. from the H,SO,, hence the amounts are omitted. The H,S0, 
had probably taken it up from the platinum stills used in concen- 
trating it. 
Silver. 
oz. dwt. grs. 
100 grains gave 25 12 5:12 per ton. 
100 2 19-84 ” 
99 2 17 19°8 
200 : BS 8 56, 
200 s Mm Vise <; 
100 a 16 410-562, 
100 ; 18 11 10-08 __,, 
(k) Mr. Hickson forwarded to me a supply of sheathing from 
the square piles of the original Queen’s Wharf, Newcastle, where 
it had been exposed for probably thirty-five years. 
The outer scale, which could be removed by a spatula, was 
dissolved as usual in pure nitric acid and the residue scorified and 
cupelled. Two assays of 150 grains each gave 
2 oz. 8 dwt. 18 grs. per ton of silver, but no gold 
1 oz. 3 dwt. 11 grs. 
Then 200 grains of the hard and adherent scale a this, with 
scrapings of the metal itself gave— 
6 oz. 10 dwt. 16 grs. per ton of silver. 
6 ” 1 ” 12:4 ” el 
Next the metal sheathing itself, dissolved in sulphuric acid, a 
after removal of the above two scrapings, gave— 
6 oz. 8 dwt. 15-3 grs. of silver per ton. 
134 
? a 
The amounts of gold are omitted since the ee were found . 
contain platinum, 
(/) Mr. Hickson also forwarded some of the old sheathing fro” a 
the bottom of the lighter « Topsy ” which was built in 1881, 
had been employed at Newcastle. 
ee ier 
