Ch. 3: Precious Gem stones in 1914

Ch. 3: Precious Gem stones in 1914 Page of 97 Ch. 3: Precious Gem stones in 1914 Text size:minus plus Restore normal size   Mail page  Print this page
GEMS AND PRECIOUS STONES.                                  333
This vein carried bluish-white transparent quartz, crude feldspar crystals, and green tourmaline crystals, some inclosing red to violet-colored cores. None of the crystals was transparent, but some were translucent.
At the locality 2 miles north of West Chesterfield, a little blasting and excavation work has been done in an outcrop of pegmatite on the nearly flat summit of the hill. The outcrop is about 100 feet long in a west of north direction and nearly 40 feet wide. Part of it stands a few feet above the ground. The country rock is fine dark-colored garnet schist belonging to the Conway schist. It strikes north with a dip of 70° E. The texture of the pegmatite varies from fine to medium coarse. Microcline feldspar occurs in crystals ranging up to 10 inches across. A little spodumene was found in the massive pegmatite. Small veins carrying yellowish-green mica, in crystals 1 to 2 inches in diameter, with quartz, feldspar, beryl, and black tourmaline cut across the pegmatite with a northwest strike. The beryls are rather plentiful and occur in crystals ranging from small size up to 2 inches thick. They are bluish-green in color but opaque or only translucent. A few of the mica crystals inclose opaque greenish-blue crystals of tourmaline of pencil size. Some of the quartz has a translucent milky color.
The pegmatite carries cavities or pockets, and one that has been opened on the east side of the outcrop is 2 feet across and 1 to 8 inches high. It has been stripped of any good specimens it may have contained, but fragments of the lining left in the pocket consisted of crude crystals of clevelandite, opaque bluish-green and indigo-blue tourmaline, bunches of greenish mica, and spodumene. The presence of pockets in this ledge makes it a favorable looking place for further prospecting, since gem tourmalines are usually found in pockets and not frozen in the rock.
Two new turquoise deposits were developed in Nevada in 1914. One of these, owned by J. F. Campbell, of Colusa, Cal., is located in the Hot Springs mining district on the east side of Reese River valley, about 35 miles south of Battle Mountain, Lander County; and the other, owned by the Cortez Turquoise Co., of Pasadena, Cal, is near the old mining camp of Cortez, along the Lander-Eureka County line, about 35 miles south of Beowawe. Information regard­ing these deposits and the quality of the turquoise was kindly given by Mr. L. A. Dees, of Los Angeles, and the owners of the properties. Mr. Dees has cut and sold some of the turquoise from both mines. The Campbell mine was discovered in October, 1914, and worked only a short time during the winter. About 300 pounds of matrix, includ­ing some pure turquoise of good quality, was taken out during this time. The pure turquoise has been selling at $1 a carat in Los Angeles. It is described as having a good blue color, with but little green, and as being hard with smooth texture. Some of the matrix has also yielded attractive gems.
The mine of the Cortez Turquoise Co. was discovered by Johnny Francis, a Shoshone Indian, several years ago. The assessment work was done by the Indian for several years and in 1914 the claim was leased to a miner who is reported to have taken out 500 pounds
Ch. 3: Precious Gem stones in 1914 Page of 97 Ch. 3: Precious Gem stones in 1914
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US Geol. Surv. 1914. Gemstones, Metals.
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