The Mother Lode region of California . -terville, superintendent. Yosemite Hydraulic Mine.—It is 10 miles east of Groveland. Thecompany has built 11 miles of ditch flume and pipe-line the past year,and made preparations to carry on hydraulic mining on an extensivescale; the scarcity of water, however, has affected operations seriously. When working full force 20 men are employed. W. J. Pender of Groveland, superintendent. 148 CALIFORNIA STATE MINING BUREAU. MADERA COUNTY. As it was necessary to pass through Madera County in going intoMariposa, a brief examination of two mines was made while in
The Mother Lode region of California . -terville, superintendent. Yosemite Hydraulic Mine.—It is 10 miles east of Groveland. Thecompany has built 11 miles of ditch flume and pipe-line the past year,and made preparations to carry on hydraulic mining on an extensivescale; the scarcity of water, however, has affected operations seriously. When working full force 20 men are employed. W. J. Pender of Groveland, superintendent. 148 CALIFORNIA STATE MINING BUREAU. MADERA COUNTY. As it was necessary to pass through Madera County in going intoMariposa, a brief examination of two mines was made while in thatcounty. In the neighborhood of Grub Gulch prospecting is activelybeing prosecuted, and also in the direction of Coarse Gold, but lack oftime precluded visiting that section the past season. The Rex Mine.—This is a new property at Grub Gulch. It has beenopened within the past few months. An inclined shaft has been sunk Ver-Tical Cross SectionRex /^INEr Grub Gulch. Madera County. .^^j^b Pi5placen?en+ of Older^V^ by Later Vzlr?.. Fig. 36. to a depth of 100 feet at an angle of 40 degrees to the eastward. At adepth of 50 feet from the surface in this shaft, the Rex vein, which isfrom a few inches to 14 inches in width and rich in free gold, was foundintersected by another vein, known as the Bullion, which dips to thewestward at an angle of 60 degrees, cutting the dip of the formationnearly at right angles and displacing the Rex vein. The formation in THE MOTHER LODE REGION—MADERA COUNTY. 149 which these veins occur is mica schist. That portion of the Rex vein inthe neighborhood of the shaft has been opened by a series of shallowpits, and by means of these the direction of its strike can be traced alongthe surface. After passing the Bullion vein, which in strike intersectsthe Rex vein at a low angle, the Rex vein does not appear in line withthe croppings on the farther side of the Bullion vein. However, fartherto the northward is a vein which has the physical characteristi
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectminesandmineralresou
