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No doubt geological knowledge is valuable to a miner, and it should assist him in prospecting; but it has never yet enabled any body to find a valuable claim. Distribution of Gold in Quartz. The rich quartz-veins of California extend from Kern River to the Siskiyou, are found on hills, in canons and in vales.
For analogous cases in clay-slate, see Professor Henslow's Memoir in "Cambridge Philosophical Transactions" volume 1 page 379, and Macculloch's "Classification of Rocks" page 351. With respect to both foliation and cleavage becoming tortuous where quartz-veins abound, I have seen instances near Monte Video, at Concepcion, and in the Chonos Islands. See also Mr.
Near Monte Video, where the stratification, as it would be called, of the metamorphic series is, in most parts, particularly well developed, being as usual, parallel to the foliation, we have seen that a mass of chloritic schist, netted with quartz-veins, is entangled in gneiss, in such a manner as to show that it had certainly originated in some process of segregation: again, in another spot, the gneiss tended to pass into hornblendic schist by alternating with layers of quartz; but these layers of quartz almost certainly had never been separately deposited, for they were absolutely continuous with the numerous intersecting veins of quartz.
This is sometimes due to the denudation, or wearing away, of the hills containing quartz-veins that is, where the alluvial gold really was derived from such veins, which, popular opinion to the contrary, is not always the case.
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