Excerpt from The Geology and Ore Deposit of the Reese River District Lander County Nevada

The veins in the quartz monzonite correspond in attitude to most of the diverse sets of joint planes traversing. That rock, although in each locality particular trends of veins predominate. Most of the productive veins on Lander Hill range in strike from N. 20° W. To N 40° W., and dip 25° - 45° ne. In the southwestern part of the district most veins strike N. 20° - 60° E. And dip steeply northwest. Farther east the principal veins strike nearly north and dip both east and west. In the southeastern part of the district the more. Persistent veins strike N. 10° 40° E. And dip steeply. Locally the vein pattern is reticulate, and throughout the district innumerable minor veins cross and branch from the main ones. Many of the discontinuities and irregularities in the veins result from the complexity of the original vein systems rather than from later fracturing. Ore shoots are in part related to cross fractures and intersections of veins. Postmineral faults are widespread, but displacements on them are commonly small.

The veins are genetically related to the quartz monzonite. Vein filling began when the temperature of the rock was high and continued until it had dropped markedly. The vein-forming solutions migrated through preexisting openings, mainly joints, that were modified and enlarged by movements during mineraliza tion. In a few places vein quartz distinctly different from that in most of the veins is present. Its character suggests that it formed at lower temperatures and pressure, possibly during the volcanism that occurred long after the main period of mineralization.

The Reese River district has been intensively prospected. Most of the prom ising areas have been tested. Exploration beneath the old workings on Lander Hill and in the relatively undeveloped area around the Union mine seems to offer better chances for finding ore like that originally mined than exploration in localities farther from the original discoveries. The veins in outlying areas seem, in general, lower in grade. They contain some metals other than silver, but, with the possible exception of gold, these hardly seem of significance with reference to the future of the district. Some of the veins in the quartzite are sufficiently large to be mined by cheaper methods than those applicable on Lander Hill.

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