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Sec. III, Ch. 1: The Ruby

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158                                   The Ruby
are of dark colour, but considers that " many individual stones may be said to rival the best Burma Rubies." In this opinion, the author, after much experience in dealing with Rubies, both from Burma and Siam, fully concurs.
The Ruby mines of Siam are chiefly situated in the Provinces of Chantaboon and Krat, and can be reached by steamer from Bangkok in less than twenty hours. Rubies are also found in the Sapphire mines of Battambong. It appears that the higher parts of the mountains in these districts consist of greyish granite, and that the rest of the country is largely composed of limestone. The precious stones occur in detrital matter, and have been worked in a primitive manner by means of pits, none of which exceed 24 feet in depth. The workings in the Province of Krat have been visited and reported on by Mr. Dimetri, from whose report some of the following details are taken : The Ruby mines in that province consist of a large number of workings in two principal groups, about 30 miles from each other, known as the mines of Bo Navong and Bo Channa. The Bo Navong mines, cover­ing an area of about 2 square miles, include thousands of holes, two to four feet in depth, near the village of Ban Navong. A coarse yellow or brown sand, forming the surface of the country, rests on a bed of clay, and at the junction is the Ruby-bearing gravel, forming a stratum from six to ten inches thick. The Bo Navong mines have been worked for the last five-and-twenty years, and the Rubies which they have yielded are of a finer quality, though usually smaller, than those of the other workings. The group of Bo Channa mines is situated about thirty miles in a north­easterly direction from Bo Navong.
An excellent description of the Ruby-mines has recently been published by Mr. H. Warington Smyth, who
Sec. III, Ch. 1: The Ruby Page of 366 Sec. III, Ch. 1: The Ruby
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