Chap. XL. ] 
VIZAGAPATAM DISTRICT. 
1049 
at Kodur and Sandanaudapuram ; whilst vredenhurgite (at Garividi) and 
manganmagnetite (at Kodur, Garbham, and elsewhere) have also been 
found. 
Since 1906 the Vizianagram Mining Go. has divided its output into 
manganese-ores and manganiferous iron-ores, all ores with 43% Mn 
and over being classed as manganese-ores, and all ores with 35 — 43% 
Mn and not less than 15% of iron being classed as manganiferous iron- 
ores. As already explained (see page 498) I consider this latter term 
inappropriate as applied to ores with more manganese than iron ; I have 
therefore designated such ores ferruginous manganese-ores, instead of 
' manganiferous iron-ores'. 
The samples taken by me from deposits Nos. 1, 2, 4, 5, 7, 11, 12, 14, 
and 20, were analysed at the Imperial Institute. The results are inserted 
later in the descriptions of the respective deposits ; but the limits 
and mean of these 12 analyses are shown in the following table : — 
Limits. 
Mean. 
32-21 to 49 05 
42-96 
4-80 to 15-70 
11-22 
1-10 to 10-30 
4-29 
0-13 to 0-48 
0-27 
0-50 to 1-85 
0-90 
Manganese 
Iron 
Silica 
Phosphorus 
Moisture 
These can be compared with the analyses of Kodur and Garbham 
ores given by Mr. Turner in the Jour. Iron Steel Inst., No. II of 1896, 
page 160 : — 
Manganese 
Iron 
Silica 
Phosphorus 
Moisture 
I. 
II. 
III. 
IV. 
V. 
48-65 
46-15 
50-35 
45-08 
47-09 
7-10 
10-35 
6-38 
13-23 
10-80 
2-23 
3-20 
3-21 
4-60 
2-45 
0-12 
0-21 
0-24 
0-27 
0-26 
1-10 
1-30 
1-65 
1-80 
1-48 
Note. — I and II. Kodur ore ; III aud IV. Garbham ore; V, Garbham ore (cargo 
test). 
and with the following summary of figures representing the average 
quahty of the ores mined by the Vizianagram Mining Co. They are 
