. The prospector's field-book and guide in the search for and the easy determination of ores and other useful minerals. earing by evapora-tion or absorption. Frequently, cellular quartz has been found withgold within the cells, the material which surroundedthe gold having become decomposed, and, thusreleasing the undecomposed gold, the latter is foundin the cells of the quartz. Gold, therefore, is to be expected and looked forin granitic regions (Fig. 46), and in those rocks andfrom those gravels and sands which owe their originto such regions. It requires much judgment, gen-eral exploration,
. The prospector's field-book and guide in the search for and the easy determination of ores and other useful minerals. earing by evapora-tion or absorption. Frequently, cellular quartz has been found withgold within the cells, the material which surroundedthe gold having become decomposed, and, thusreleasing the undecomposed gold, the latter is foundin the cells of the quartz. Gold, therefore, is to be expected and looked forin granitic regions (Fig. 46), and in those rocks andfrom those gravels and sands which owe their originto such regions. It requires much judgment, gen-eral exploration, and knowledge of the region beforethe prospector can, with probability, expect to meetwith gold, or before he should begin the search. GOLD. 127 But with a full knowledge of the geologic conditionof the country, and acting in accordance with theabove facts, the prospector will soon come upontraces of gold, if any exist. In looking for indications, the prospector shouldnever pass an ironstone blow-out without ex-amination, as, according to the German aphorism, the iron hat covers the golden head, or as the Fig. Section showing the two conditions under which gold is usually found in rock and Structure of the Ural Mountains.—a. Granitic and gneiss rockspenetrated with greenstones and porphyrytic rocks containing gold finelydisseminated, b. Micaceous, talcose, and argillaceous slaty rocks, snpposedto be Laurentian and Cambrian, c. Silurian and Devonian strata, d. Car-boniferous, limestone and grits, e. Coal measures. /. Permian and newerrocks. O, G, O G. Drift, filling hollows in rocks with gold, especially at thebase of the drift. Cornishman puts it, iron rides a good ironstone outcrop may cover a gold, silver,copper or tin lode. Besides the general instructions given above, con-siderable study should be devoted to the peculiarand seemingly irregular deposits of gold where itdoes not appear to have been washed down from anyhigher levels. For instance, in
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