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Ch. 2: Precious Gem stones in 1893

Ch. 2: Precious Gem stones in 1893 Page of 36 Ch. 2: Precious Gem stones in 1893 Text size:minus plus Restore normal size   Mail page  Print this page
700                         Mineral resources.
The revenue for 1892-'93 was 35,000 rupees and for the year 1893-'4, 52,000 rupees.
LAPIS LAZULI.
One of the many remarkable objects in the Montez collection, Anthropological Building, at the World's Fair, was an immense mass of lapis lazuli measuring 26 inches by 14 by 8, and weighing 360 pounds, found in a stone grave in the vicinity of Chankas, Peru. The lapis lazuli was of a fine blue color and this is one of the largest masses known. In the Montez collection there was also a number of small idols and figurines of light green and dark green turquoise, the blue color having been destroyed by burial, if it had ever existed. These were obtained in the same region of Chankas, in a stone grave. With them were some small animals made of sodalite mistaken for lapis lazuli, also found ill the vicinity of Chankas, near Cuzco, Peru. The entire collection has been acquired by the Field Columbian Museum at Chicago.
LABRADORITE.
The original locality on the coast of Labrador has been prospected for the past two years, and Lloyd & Taber, of New York, have obtained an extensive Government grant of the only available deposits, from which they have already obtained four tons of good material.
GEM EXPLORATION IN CEYLON.
Mr. Barrington Brown in January, 1893, presented a report on gem-mining to the Ceylon Gem and Mining Syndicate, limited. In this report he says that the rock formations of the island are chiefly gneiss, permeated occasionally by graphite, garnet, and occasional beds of limestone, and suggests that the latter may be the source of the spinels which are occasionally found with the rubies and sapphires.
In the districts visited the gems are generally found in beds of gravel called Ulan by the natives. Usually a number of beds of this Ulan occur, one over the other, separated by strata of alluvial matter in the form of mold or clay. The problem which presents itself to those in the syndicate is to find inexpensive methods of working the lower beds of gravel; as the upper strata have undoubtedly been frequently worked in the search for gems during the many centuries in which gem mining has been carried on by the Singalese, as well as by the natives of India, who have visited the island for this purpose. There is only one instance mentioned of valuable gems being found in the main mass of gneissoid rock. They are always found in the gravel, and hence the rocks have never been searched. Mining is entirely carried on in the beds of streams and rivers, both ancient and modern, where the gems must have either fallen from the overhanging rocks, or come from the wearing down of rocks at some distance from the river by tributary streams.
Ch. 2: Precious Gem stones in 1893 Page of 36 Ch. 2: Precious Gem stones in 1893
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US Geol. Surv. 1893. Gemstones, Metals.
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