Annual report of the State Mineralogist for the year ending ... (1883)
California State Mining Bureau · Sacramento : California State Mining Bureau · leaf 827
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… … 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…
California State Mining Bureau · Mines and mineral resources · Gold mines and mining · Geology · Mineralogy
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