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Lost Grass Valley Gold Rush History of the Wilhelm & Binkleman Pioneer Families by Waldo C.F. Potter (2024) (374 pages)
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Page: of 374
84
richest part of the vein was found in the Pennsylvania
and Empire mines above the 4,600-foot level, where a
larger percentage of the total drift length than in the
EXPLANATION
Stope
Aititude’Sbave sea level
500
Mine level
lower levels in the North Star mine was through stopable ore. .
Pennsyloania vein—The Pennsylvania vein strikes
north and dips at an average angle of 40° W. Lindgren
traced the outcrop for 1,000 feet north of the shaft but
was unable to trace it to the south. On the 1,000-,
1.100-. 1.400-. 1.700-. and 3.400-foot levels (nl. 32)
201
Ficure 60.~Map showing workings on the Pennsylvania and W. Y. 0. 0. veins and the upper part of the X vein. Stoped areas are outlined with a dash line.
GOLD QUARTZ VEINS OF GRASS VALLEY, CALIFORNIA
the vein is fairly continuous and has been followed
north from its junction with the X vein for about 4,000
feet. As the drifts approach the contact between
granodiorite and Calaveras formation, the vein undulates on the strike and splits into many branches, and
the gold content is too low to justify stoping. In the
lower levels the width of the vein ranges from less than
1 foot to 3 feet or more. The vein walls are generally
sharp; gouge of variable width and position is present;
and the auartz is commonly sheared or brecciated.