The Quarterly journal of the Geological Society of London . en extremely rich. Passing over the hillat the head of this, I came into another ravine of equal or greaterlength and steepness, called Jackass Gulch, trending in the same linewith the former, but falling into the Stanislaus in the direction ofCarsons Hill. On the other side of the river, another rich ravine(called Indian Gulch) commences and runs nearly to the top of Car-sons Hill. Carsons Hill Quartz Mining Works.—After crossing the river,by means of a ferry established at this place, I ascended CarsonsHill, and witnessed the works
The Quarterly journal of the Geological Society of London . en extremely rich. Passing over the hillat the head of this, I came into another ravine of equal or greaterlength and steepness, called Jackass Gulch, trending in the same linewith the former, but falling into the Stanislaus in the direction ofCarsons Hill. On the other side of the river, another rich ravine(called Indian Gulch) commences and runs nearly to the top of Car-sons Hill. Carsons Hill Quartz Mining Works.—After crossing the river,by means of a ferry established at this place, I ascended CarsonsHill, and witnessed the works being carried on there in quartz-mining. The hill is composed of chlorite-slate, rises to the elevationof 500 feet above the level of the river, and is pierced by the quartz-vein already mentioned, which is easily traced down both sides, butprojects above the summit like a massive wall. A cross-section ofthe vein (fig. 4) shows it to be wedge-shaped, being about 20 feet Fig. 4.—Section of the Quartz-vein in Carsons Hill: fromthe N. W. Height 200 micaceous slate. Chloritic slate. Quartz-vein, containing large pieces of slateand auriferous in its upper portion. in thickness at the top and decreasing to about one foot at the bottomof the hill. In its thickest part it imbeds large masses of the slate, 1854.] WILSON CALIFORNIA GOLD-FIELDS. 315 which seem to have fallen into the rent, previously to or during theformation of the quartz-vein. It was in the highest part of this vein, and on its lower side(fig. 4), that the gold was first discovered, and it was certainly therichest portion of the rock ; for, having been tried at different eleva-tions, it is found to lose all traces of gold as it descends. At the topof the hill the quartz-vein was in a state of decomposition, and of areddish colour ; and, besides gold, it here contained a large amountof iron and slight traces of copper ; but the lower part of the veinbecomes white, glassy, and hard, and void of all traces of me
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