MINERALOGICAL DESCRIPTION OF THE ISLAND OF BANKA. 7^1 
tions of a semi-metallic lustre, the surface covered with small tu¬ 
bercles, very ponderous. 
2. Bog-Iron-ore, the fracture exhibiting laminee of irregular 
disposition, the interstices filled with oclireous earth, 
3. Red-Iron-stone of a prismatic or rhomboidal form. I col¬ 
lected various specimens here which are completely regular ; some 
fragments are trapezoidal. 
4. Red-Iron-stone , the form approaching to stalactitic. 
5. Red-Iron-stone, the fracture regularly striped with alternate 
bands disposed horizontally or circularly in concentric layers. 
6. Red-Iron-stone, the fracture cellular, the cavities filled with 
substances ot different colours. 
7. Red-Iron-stone, approaching the nature of Bog-Iron-ore. 
8. Compact Red-Iron-stone similar to the cement of the Pou- 
dingues of Sungie Baru, the fracture dark coloured and shewing 
minute particles of quartz. 
The establishment, above mentioned, is situated near the south¬ 
ern boundary of the stratified district surrounding the mountain Ma- 
numbing. Numerous remains of Tin-mines are found in the vicinity : 
these exhibit the usual appearances of deserted mines, a naked sur¬ 
face or an incipient vegetation. Extensive aqueducts are also re¬ 
maining ; the supply of water was obtained from the numerous ri¬ 
vulets flowing from the mountain M$nu tubing or from the branches 
of the rivers Teluk Roibya and Minto-Tawar. These remains ex¬ 
tend towards the acclivities of the Manumbing. Beyond the district 
in which the separate granite rocks project from the surface with 
the siliceous substances usually found at the mines, I collected 
rounded fragments of Red-Iron-stone. The strata here, particu¬ 
larly to the east-ward have been very rich in ore of Tin, and very 
larg*e quantities of that metal were formerly prepared in the district 
of Minto; in the account of the mines, I shall mention those situa¬ 
tions in which, according to the account of the natives, some ore is 
still remaining. 
Many of the former mines were situated on the banks of the ri¬ 
ver Minto-Tawar, and the fragments carried down the stream and 
collected during the dry season, in the bed of the river, will explain 
in some degree, the constitution of the strata in which they were 
worked. I shall mention them in the order of the abundance in 
which they were found. 
1. Red-Iron-stone in fragments tabular or variously excavated 
