1841.] Report on the Manganese of the Mergui Province. 853 



the means of tracing the mineral deposit. The Great Tenasserim river 

 has passed through the manganese bed in one spot 2^ miles removed 

 from two other points at which it occurs to the north and south, at 

 both of which it is likewise discovered near the surface by the action 

 of the streams Thuggoo and Therabuen, the probability therefore is, that 

 it is an horizontal deposit, covering many square miles. But without 

 indulging in conjecture, there is sufficient at the localities referred to, 

 to indicate large quantities of manganese ore, which could be collected 

 by penetrating through the soil lying above it, and immediately near 

 the spots in which it is now exposed to the day. 



It occurs in the form of the black oxide, and is the manganese of 

 commerce. It is largely consumed in Europe in the preparation of 

 bleaching compounds, and when pure, is valuable to the manufacturers 

 of glass. 



The soft black ore, No. 1 , is a hydrate of the peroxide of manganese, 

 known under the name of wad. It contains of water two equivalents 

 or 9 per cent. 



Iron, 1.96 grains by analysis. 



Its specific gravity is 1.47. 



The specific gravity of the grey peroxide. No. 4, is 2.46. 



(Signed) G. B. Tremenheere, 

 Capt Executive Engineer, 

 Moulmain, 11th September, 1841. Tenasserim Division. 



5q 



