Bulletin, Issue 23 (Google eBook)

Front Cover
State Office, 1902 - Geology
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Page 270 - ... compete with private assayers. The presence of minerals is determined, but not the percentage present. No charges for this service are made to any resident of the State. Many of the inquiries made of this department have brought capital to the development of new districts. Many technical questions have been asked and answered as to the best chemical and mechanical processes of handling ores and raw material. The laboratory is well equipped. THE DRAUGHTIN-GROOM.
Page 272 - Bureau began in 1893. No other State in the Union attempts so elaborate a record, expends so much labor and money on its compilation, or secures so accurate a one. The State Mining Bureau keeps a careful, up-to-date, and reliable but confidential register of every producing mine, mine-owner, and mineral industry in the State. From them are secured, under pledge of secrecy, reports of output, etc., and all other available sources of information are used in checking, verifying, and supplementing the...
Page 263 - ... make a collection of typical geological and mineralogical specimens, especially those of economic and commercial importance, such collection constituting the museum of the...
Page 224 - ... extensive width. One tunnel is in 46 feet. There is a shallow shaft 10 feet deep. The' greater part of the work is against the face of the bluff, where the veins are exposed. The copper ores are sulphides, oxides, and green carbonate, and it is said that they carry values of $4 to $5 in gold per ton. FRESNO COUNTY. About 30 miles of the foothill copper belt measures the narrowest part of the large and important county of Fresno, which stretches from the crest of the Sierra Nevada range for nearly...
Page 128 - Humboldt County, a distance of seven miles. Owners. CB Bulger and others, Anada. Trinity County. Rainbow Group. This property, consisting of nineteen claims, is situated in the Mattole mining district, sixty miles south of Eureka, in sections 19, 30, and 32, township 1 south, range 1 east; also in sections 12 and 19, township 1 south, range 1 west.
Page 159 - ... and the vein is perpendicular. There is a crosscut on the vein 10 feet in length, with no wall discovered. A good quality of iron and copper pyrites is shown in face of cut. The same class of ore is traced northerly by cuts for 900 feet. On the Orient claim a tunnel has been driven 150 feet. On the mountain side and following the course of the proposed tunnel twelve ledges are encountered, all exposed by open cuts. The widest vein is found near the, apex of the hill and is about 13 feet wide....
Page 167 - County. The Monmouth and Climax claims are owned by JF Dempsey of Smartsville. with this tunnel, as that number outcrop on the hillside. The course of this vein is east of north. The thirteen parallel veins vary from 5 to 30 feet in width on the outcrops. All of them show chalcopyrites. A shaft near the hilltop follows the 100-foot vein pitching to the east, which shows some very good red oxide, carbonate, and sulphide ores. The formation that incloses the mineral is a hard diabase. The Last Chance...
Page 210 - ... is known to be 50 feet long, 4 feet wide, and over 100 feet deep. It consists of a dark-colored sulphide ore, said to carry from 6 to 12 per cent of copper and $2.50 in gold. Carbonates of copper predominate down to the 100-foot level, where it all changes into MARIPOSA COUNTY COPPER CLAIMS. sulphides. The vein is traced through the whole length of the property and extends both ways into other properties. There are several openings on the main vein, some of which were made in the sixties. The...
Page 263 - It shall be his duty: to collect statistics concerning the occurrence and production of the economically important minerals and the methods pursued in making their valuable constituents available for commercial use ; to make a collection of typical geological and mineralogical specimens, especially those of economic...
Page 30 - The above statement does not inform us what ton was used as a basis of calculation for a period when the short, long, and Welsh tons were variously so used, and it does not distinguish between copper ores and copper matte. It, however, corresponds in a general way with the annual condition of the industry. When transcontinental railroads were established copper shipments began to be also made by rail, and the statistics of exports by sea became still less a reliable measure of production. From the...

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