File:Annual report of the State Mineralogist for the year ending (1883) (14778296815).jpg

Identifier: annualreportofst10cali (find matches)
Title: Annual report of the State Mineralogist for the year ending ...
Year: 1883 (1880s)
Authors: California State Mining Bureau
Subjects: California State Mining Bureau Mines and mineral resources Gold mines and mining Geology Mineralogy
Publisher: Sacramento : California State Mining Bureau
Contributing Library: University of California, Davis Libraries
Digitizing Sponsor: University of California, Davis Libraries

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was found to expand into several pockets of seven to as much as sixteenfeet in diameter, from which great masses of the asphalt material wereextracted; the whole output from this cut alone was one thousand fourhundred tons. At one point a wall of the ore appeared sideways over-head. This proved to be a spur vein joining the other from the left(southwest) at an oblique angle, its strike being northwest, pitch 42 degreesdue southwest, with a thickness of three to four feet, increasing to sixfeet of clear asphalt about ninety feet from the entrance of the cut.There being at the time a heavy demand for the material, the mainvein was for the time being abandoned for the spur, which wasfollowed on an incline for thirty-eight feet, with a width of ten feet, untilthe level of the present gangway was reached, twenty-six feet below the The variability of thickness and form renders all these measurements only approxi-mate; magnetic bearings arc given; var. 15 degrees east. .elSSSS ,aM :*■ It I
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VENTURA COUNTY. 765 floor of the cut. As the spur vein then appeared to widen on the line ofstrike to northward, it was pursued and was found to expand into ahuge pocket, which, when mined out, formed an irregular chamber aboutthirty feet square by twelve to fifteen (at one point thirty) feet high,from which, inclusive of the incline, some four hundred and fifty tonsof material were obtained. This chamber was found to represent the junction of the main veinwith the spur; on sinking in continuation of the first incline on thespur vein, another expansion was found, constituting an ore masssome fourteen feet wide by twelve feet in thickness, nearly thirty feethigh, standing directly across the main vein. The latter comes in onthe east wall of this chamber with a thickness of three and one halffeet, and continues on the west wall with a face of seven feet, while thespur vein has dwindled down to three feet and apparently tends towedge out. In going down on the main vein, eighty feet back

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