CHAPTER XXIV. 
ECONOMICS & mmmG-continued. 
Valuation and Chemical Campasition of Manganese- 
ores. 
Valuation of manganese-ores — Mining Journal prices — Schedule of the Carnegie 
Steel Company — Requirements made less stringent during K06 — Special prices — 
Valuation of ores for chemical purposes — Nomenclature of manganese-ores and 
manganiferous iron-ores — Ferruginous manganese-ores. 
Tables of analyses of Indian ores — Summary of tables of analyses— Analyses 
of Indian ores expected by buyers. 
Analyses of manganese-ores of the World — Analyses of cargoes of Indian and 
foreign ores landed at Middlesborough — Analyses of the manganese-ores of the 
world. 
The less important constituents of Indian manganese-ores — Alumina — Baryta — 
Lime — Magnesia — Potash — Soda — Arsenic — Sulphur — Cobalt and nickel — Copper- 
Lead — Zinc — Titanium — Combined water — Carbon dioxide. 
Valuation of Manganese-ores. 
As has been explained on a previous page, the price per ton of man- 
j^.^. J 1 ■ ^ ganese-ore obtained on its delivery c.i.f. at the 
a puc b. ^^^^ of destination is subject to great variations 
according to the price per unit of manganese. On pages 415-6 is given 
a table showing the fluctuations in the price per unit of manganese for 
ores of different grades since 1890, as quoted in the Mining Journal. The 
variations are illustrated by a diagram (fig. 23) on page 417. On 
pages 447-9 I have considered the relation between the prices of man- 
ganese-ore at different times and the Indian output 
The prices given in these tables are for the three grades into which 
manganese-ores are, for commercial purposes, classified : — 
1st grade .. .. 50% Mn. and upwards 
2nd grade ., .. 47—00% Mn. 
3rd grade .. .. 40—47% Mn. 
As an example of the way in which the schedule of prices is apphed 
we can take the case of a 52% ore from the Central Provinces in January 
1907. The average price at this time was 15| pence per unit. The price 
then per ton paid or this ore would be •^-^''^^-^-=67 shillings and 2 pence 
per ton = £3 -7-2. 
