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The field season being over for most of these parties: Messrs. Oldham, La Touche, and Sub-Assistants Hira Lai 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 {there 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 ever)' 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 i8gi.

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List of Assays and Examinations made it the Laboratory, Geological Survey of Ind,a, during the months of

February, March, and April -91.


Quarta, for gold

l specimens of felsite,
quartaite- and blue
quartz- for gold.

Granulite with garnetO
for opinion.

Pistacite vein in decom-
posed granite, magne-
tite- chalcopyrite and
quartz- for opinion.

Quartz- qunrtz with plates
of specular iron-ore- and

l specimens of quartz, for
gold, and a specimen of
specular iron-ore, for
iron- from the Porahat

l specimens of coal, taken
from the borings in
Hilogoria- for assay.

Specimens of earth and
carbonaceous powder-
with crystals of selenite,
from between the Rosha-
lin and the Gugger
riverO for opinion.

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All the specimens contain lime in small quantities. Two average samples selected from the quantity received (l maunds)- gave the following result:

(') (a)

Moisture ....... g'88 9'0

Volatile matter 54'l6 56 84

Fixed carbon ...... 2l'46 22 96

Ash ........ O2*l0 o"O 1io

ioo'oo O0000

Does not cake, but sinters slightly. » 2 O

Ash—light buff.

Contains a good deal of mineral resin.

Contains- besides cassiterite, a few black grains of wolfram- minute quarta granules- and a few

grains of spinel. Yielded on assay:— 73'52 per cent, of tin (Sn.)

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

February, March, and April i8gr—continued.

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Rongap river
outcrop- Rongraigin
Quantity received-
O0 oz.

Moisture 8'84

Volatile matter 44'>o

Fixed carbon ...... 29 86

Ash ........ '7*20

I "'O

Sp. gr. . . . . . . i'22

Does not cake- but sinters slightly.
Ash—pale red.

A. Chalcopyrite and pyrite, with clay-slate and quartz.

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. Quarta with peach and pyrite.

G. Chalcopyrite and pyrite- in clay-slate.

(O) Fragments of quarta, and titaniferous iron-ore- with decomposed iron-oxides.

(2) Granite with veins and strings of green epidote.

(l) Fragments of hyd rated oxides of iron.

Pieces of dolerite with fresh plagioclase and augite.

(4) Fragments of hydrated iron-oxide.
Titaniferous iron-ore.

(5) Quarta- with pseudomorphous cavities after micaceous iron-ore.

(6) Quarta with films of specular iron-ore.

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