Collection: Books and Periodicals

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Title: 1895 Pictorial History of Nevada County, California (979.437 COM (622.342 NEV, PH 1-4))(2000) Collection Type: Books and Periodicals Catalog #: 979.437 COM (622.342 NEV, PH 1-4) Author: W. F. Prisk, J. E. Poingdestre, and Samuel Butler. Foreword and index by David A. and Ardis H. Comstock. Publisher: Grass Valley: Comstock Bonanza Press Related Items: Directories > Nevada County Mining Review (622.342.NEV)(1895) Pamphlets > Grass Valley and Vicinity (PH 1-4)(Circa 1895) Published: 2000 Copyright: In the public domain or published before 1925 Subjects: Nevada County, Grass Valley, Nevada City, Mines, Mining Industry, Who's Who, 19th Century, 1890s Notes: Full title: 1895 Pictorial History of Nevada County, California: Reissue of "Nevada County Mining Review" compiled by William Frederick Prisk Jr. and the staff of the Grass Valley Daily Morning Union and "Grass Valley and Vicinity" compiled by J. E. Poingdestre with an historical sketch by Samuel Butler: To which has been appended a new foreword and a comprehensive index compiled by David A. and Ardis H. Comstock. vi, 186 pages. # of Pages: 194 Download PDF: User Login Required Download OCR Text: User Login Required

Metadata By: Bill Wetherall Printed or handwritten: All printed text Date Scanned: 2024-07-21 19:24:05 Scanning Equipment: CZUR Book Scanner Item Sourced From: TIFs First Created: 2024-08-07 22:21:34 Last Updated: 2024-12-07 05:53:36

Original Held At: Searls Historical Library Location: 161 Nevada City Hwy, Nevada City, CA 95959

Page: of 194  

«heehee GRASS VALLEY AND VICINITY NEVADA COUNTY REDUCTION WORKS. MattMAN & THompson, Proprietors. Highest market price paid for gold-bearing sulphurets. Personal attention given to assaying sulphurets or ore. Small tests by chlorination and amalgamation a specialty. Plans and specifications furnished for chlorination works of any desired capacity. Will superintend construction of same. To outsiders who are unfamiliar with the chlorination process, a few words of explanation may be of interest. The gold-bearing quartz ledges in this vicinity carry from one to five per cent of sulphurets, the larger portion the sulphide of iron, with smaller quantities of the sulphides of lead, copper, zinc, arsenic, and antimony. The suphurets are saved in the mills of the various mines by conducting the pulp, after the free gold has been extracted by amalgamation, over concentrators of the endless belt variety, which separate the sulphurets from the quartz by reason of the difference in their specific gravities. The concentrates are sold by the mines, as no one mine in the Grass Valley district at present makes sulphurets in sufficient quantity to warrant the erection of their own chlorination plant. In extracting the gold by chlorination, the sulphurets are first roasted in a long reverberatory furnace to expel the sulphur and so disintegrate the particles as to allow the action of the chlorine gas throughout. After they have been roasted they are cooled and placed in tubs with false bottoms and sand filters; chlorine gas made in lead generators is then conducted by lead pipe into a hole in the bottom of the tub, and when the gas has risen through the ore, the tub is covered and sealed. The gas is allowed to act on the ore for thirty-six hours, during which time the gold in the sulphurets is converted into a chloride of gold, which is then leached out with water and precipitated with sulphate of iron. This precipitate is filtered, dried, melted, and poured into moulds. iN eg (ast NEVADA COUNTY REDUCTION WORKS. » 160..