Gold Mining Notes. 
49 
ton of rock is ascertained by weighing the resulting gold. 
The following table is furnished by Mr. Attwood : — 
Prospectors 1 and Miners* Gold Table to determine free Gold per ton of 
2000 lbs. average. Sample for working test 4 lb. avoirdupois, 
28,000 grains. 
Weight of 
washed Gold 
4 lb. Sample in 
Grains & tenths. 
Fineness 780 
value per oz. 
$16 12. 
5 Grains. 
4 „ . 
3 »» • 
2 „ . 
1 .. • 
•9 »> • 
•8 „ . 
7 n ■ 
•6 „ . 
*5 ,, ■ 
*4 ,, ■ 
•3 „ ■ 
•2 „ ., 
•1 ,, .. 
83 97 
67 18 
50 38 
33 59 
16 79 
IS " 
13 43 
11 75 
10 07 
8 40 
6 71 
5 03 
3 36 
Fineness 830 
value per oz 
$17 is- 
89 36 
71 49 
53 61 
35 74 
17 87 
16 08 
14 29 
12 51 
10 73 
8 93 
7 14 
5 36 
3 57 
1 78 
Fineness 875 
value per oz. 
$18 08 
94 20 
75 36 
56 52 
37 68 
18 84 
16 95 
i5 07 
13 19 
11 30 
9 42 
7 53 
5 65 
3 76 
Fineness 920 
value per oz. 
$19 01 
$ 99 °5 
79 24 
59 43 
39 62 
19 81 
17 82 
15 84 
13 86 
11 88 
9 90 
7 92 
5 94 
3 96 
1 o8 
The importance of such tests is much insisted on in 
the Reports, and examples are given where their absence 
has occasioned the expenditure of vast sums of money 
which were utterly lost, while the fallacy of gauging the 
value of a rock by pounding in a mortar bits taken here 
and there, and washing out the gold with greasy fingers 
in a horn spoon, and then by means of a magnifying 
glass guessing the gold contents of the rock, is also 
pointed out. 
The weight of the gold which results from the above 
