Imagens das páginas

The field season being over for most of these parties : Messrs. Oldham, La Touche, and Sub-Assistants Hira Lal and Kishen Singh are returning to headquarters. Mr. P. N. Datta, having broken down through sickness, will also return to head-quarters.

Dr. Noetling remains in Upper Burma, being closely associated with the Financial Commissioner's office at Rangoon in connection with the settlement of the demarcation and leasing of the Yenangyoung and Minbu oil-fields. He is also engaged on exploration duty at the possible occurrence of coal in the Myingyan district. We do not entertain any hopeful expectation of coal being met with on that side of the Irrawaddi valley; but it is necessary to set the point at rest, in view of the proposed construction of a railway branch in that direction.

Mr. Middlemiss is on deputation with the Black Mountain Expedition.

Mr. Griesbach availed himself of privilege leave for three months on the 9th April.

The Director was on tour in Lower and Upper Burma from the 12th of March to the 29th of April, when, besides other work, the tin exploration in Tenasserim and the coal and oil exploration in Upper Burma were inspected. The results of the tin exploration are very promising at Maliwun, Thabawleik, and on the Little Tenasserim river; so much so that įthere is every reason for concluding that the ultimate development of these tracts under a system of encouraged Chinese labour, similar to that of Perak, will prove a fruitful source of revenue in the Mergui district. A most important find in the neighbourhood of Maliwun is that of a stanniferous zone of rocks—which, for practical purposes, may be called a 'reef'which is evidently one of the sources of the tin-bearing gravels in that region. The legitimate inference arising out of this discovery is that, as the pathless and dense jungle becomes cleared in places from the hills confining the alluvial tracts, very many more such stanniferous zones shall be found, possibly of sufficient richness to offer inducement even for the starting of European mining when the country shall have become more opened out and populous.

The Yenangyoung and Minbu oil-fields were next visited, when it was most satisfactory to find that the structure of the former field has been thoroughly and successfully studied by Dr. Noetling, while his demarcation of the area into convenient blocks has been judiciously aligned with a persistent anticlinal, the crest of which is the gathering or collecting zone of, oil assemblage on that side of the Irrawaddi river.

So far, this oil development is progressing very favourably; the production is on the increase, while the supply of oil remains undiminished. There is likewise every prospect of the oil-bearing zone, having a productive extension for many miles to the northward of the present area, because the anticlinal, though much squeezed and even broken in many places, preserves a persistent strike to the northward for over 160 miles, as far as Mingin on the Chindwin river. As it is, there is the oil-field of Yanangyat, which is also being demarcated, and further oil indications, north-west of Pokoku and south-east of Kongma, on the same line.

The Minbu field below Yenangyoung, but on the right bank of the river, is also being demarcated. It lies on a parallel anticlinal, the northerly and southerly extensions of which have yet to be tracked out.

List of Reports and Papers sent in to Office for publication or record

during February, March, and April 1891.

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. Report on the coal-fields of the
Northern Shan States.

Appear in the current

Records, Geological . Note on the reported Namsèka Ruby-l/ Survey of India.

mines in the Mainglon State.

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. Translation of a portion (Ceylon Will appear in the Re.

and Salemi of M. Al. Lacroix' | cords, Geological Sur.
Contributions de l'étude des vey of India, for August
gneiss à pyroxène et des roches next.
à wernerite.

List of Assays and Examinations made in the Laboratory, Geological Survey of India, during the months of

February, March, and April 1891.

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Yielded on assay :

43.89% of tin (Sn.) | 69:66 % of tin (Sn.) | 36-56% of tin (Sn.) 44:80 % of tin (Sn.)
Contains large quanti. Contains iron, manga. Contains iron pyrites, Contains large quanti.

ties of iron, manga nese, and tungsten mica, quartz, felspar ties of iron, manga.
nese, and tungsten, in small quantities and wolfram mixed nese, and tungsten,
derived from the only. The best with the cassiterite. derived from the wol-
wolfram mixed with sample of thefour.

fram mixed with the the cassiterite.


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All the specimens contain lime in small quantities. Coal taken from surface Jas. Rollo, Executive Two average samples selected from the quantity received (3 maunds), gave the following result :beds and sides of the Engineer, Naga Hills


(2) upper reaches of the division. Moisture

9:10 Doigrung river, in the

Volatile matter .

• 54'36

56.84 Mikic and Rengma

Fixed carbon

• 23:46

22'96 Hills, Naga Hills dis

Ash . . . . . .

. 12*30

I1'10 trict.


Does not cake, but sinters slightly.
Ash-light buff.

contains a good deal of miner al resin.
Tin-ore, from Maliwún, Dr. H. Warth, Geolo | Contains, besides cassiterite, a few black grains of wolfram, minute quartz granules, and a few
for assay.
gical Survey of India. grains of spinel. Yielded on assay :-

73.52 per cent. of tin (Sn.)

List of Assays and Examinations made in the Laboratory, Geological Survey of India, during the months of

February, March, and April 1891-continued.

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Moisture .
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Fixed carbon
Ash . .







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100'00 Sp. gr.

Does not cake, but sinters slightly.

Ash-pale red.
Cerussite, impregnated GILLANDERS, ARBUTH-

with lead-oxide, from NOT, & Co., Calcutta.

Sambalpur, for assay.
Galena, from Sambalpur,

for assay.
7 specimens of minerals P. N. Bose, Geological | A. Chalcopyrite and pyrite, with clay.slate and quartz.

from Sikkim, for deter: Survey of India. B. Talcose-schist with pyrite, chalcopyrite, bornite, copperas and blue vitriol with small traces of

C. Chalcopyrite and pyrite, in clay-slate.
D. Talcose-schist.
E. Pyrite.
F. Quartz with peach and pyrite.

G. Chalcopyrite and pyrite, in clay-slate.
6 specimens of minerals, O. L. Fraser, Indian (1) Fragments of quartz, and titaniferous iron ore, with decomposed iron oxides.
for determination, | Museum.

(2) Granite with veins and strings of green epidote.
(3) Fragments of hydrated oxides of iron.

Pieces of dolerite with fresh plagioclase and augite.
(4) Fragments of hydrated iron-oxide.

Titaniferous iron-ore.
(5) Quartz, with pseudomorphous cavities after micaceous iron-ore.
| (6) Quartz with films of specular iron-ore.

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