. The universal assistant, and complete mechanic : containing over one million industrial facts, calculations, receipts, processes, trade secrets, rules, business forms, legal items, etc., in every occupation, from the household to the manufactory. pressure of super-incumbent rocks during millions of years, in forming rf)Cks cf ] limarygraywacke from sand, and primary slates from clay. In ex]iloring or pros-pecting for mineral veins, it is well to remember that gold is not confined BOW TO FIIfD MINEBAIi pEPOSITS. J>3$ to one class of rocks. In Mariposa, Cal., some gold-bearing quartz veinsa
. The universal assistant, and complete mechanic : containing over one million industrial facts, calculations, receipts, processes, trade secrets, rules, business forms, legal items, etc., in every occupation, from the household to the manufactory. pressure of super-incumbent rocks during millions of years, in forming rf)Cks cf ] limarygraywacke from sand, and primary slates from clay. In ex]iloring or pros-pecting for mineral veins, it is well to remember that gold is not confined BOW TO FIIfD MINEBAIi pEPOSITS. J>3$ to one class of rocks. In Mariposa, Cal., some gold-bearing quartz veinsare in granite; but tlie largestiiiul richest are in slate :^We notedOncida,Keystone, Kiireka and Springhill veins arc also in slate, to;;etlicr with themost valuable veins in Amador. The vein oC the Eureka had a thirkne^s ofG ft. at its outcrop on the surface of the ground; and dotvn to a depth 6tloOO ft., to which it has been worked, the thickness and value has con-stantly increased with the sinking. In the Calaveras district, rich gold-bear-intr quartz veins are found both in liniCftono and granite; in Tuolumne tharichest veins occur in granite Im tlie Alt;i district the wall-rock is serixsotine, with white talc iii the richest Fig: 1. Ground plan of the intersection of lodes in the Ipmmelfalirt min«. Tlie engraving, sketched by Weis^^enbach, shows the appearancepresentedby the intersection of two veins in the Ilimmelfalirt mine, near Freiburg,Germany. Jletallic ores exist in four ways : 1. In irregular masses. 2. In fissurogor veins crossing the strati and filled witii tiic ore, combined ^vith somematrix. 3. In regular interstratified layers Or beds, and 4. Intermixed iasuirill fragments among rocks. A knowledge of geology and geometry is of the utmost value to thepractical miner to aid him in ascertaining the location of mineral deposit.,and to operate to the best advantage in obt:iiiiing possession of them. Theinstruments used are : 1. The compas
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Keywords: ., bookcentury1800, bookdecade1870, booksubje, booksubjecttechnology
