SARAWAK MINERALS. — BI J. S. GEIKIE. 197 
disseminated through the ores, but also found in an 
earthy form, and occasionally in large translucent 
crystals. 
Other localities which have been noted are at Gading 
and M’rau, Ulu Skiyam in Dyke rocks, at Puak in 
Limestone, also Ulu Sadong, Sariki, Baram etc. 
Orpiment .—Found associated with Realgar. 
Stibnite .—The most common ore of Antimony. 
For many years Antimony formed the chief mineral 
export of the country but with the fall in value of the 
metal and the gradual exhaustion of the deposits the 
production is now merely nominal. This mineral is 
widely distributed, having been found in Upper Sara¬ 
wak, Lundu, Samarahan, Sadong, the Batang Lupar, 
Sariki, Bintulu etc.; however only the Upper Sarawak 
deposits have proved to be of any value. 
The common forms in which Stibnite is found are 
large granular lumps, masses of acicular crystals or 
finely disseminated in veinstone. 
A rare form has the appearance of black wool. 
Galena .—Of occasional occurrence with the Anti¬ 
mony and Gold Ores of Upper Sarawak and has also 
been found in a small vein in Santubong Mountain. 
Zinc Blende .—The black variety is found in one or 
two places in Upper Sarawak but is of no economic 
value. 
Cinnabar .—Deposits of Cinnabar are found in Upper 
Sarawak at Tegora and Gumbang, the former was 
exhausted some years ago, but at the latter the ore was 
found to be too poor to work. 
At Tegora the Cinnabar occurred as an impregnation 
in a series of much shattered shales and sandstones 
which form a hill at the foot of the Bungo Range of 
mountains. During mining operations the whole top 
of the hill was removed and a large chamber excavated 
in the hill itself. 
Traces of Cinnabar have also been found in the 
Samarahan and Sadong districts. 
Chalcopyrite— Occasionally found in a few of the 
Upper Sarawak ores. 
