|The Crater, beyond the metal posts of the old gate.|
The Weepah Hills is a more-or-less circular batch of disorganized lowlands, hills, and mountains, with the apparently chaotic to jumbled geologic formations of the area having been horizontally sliced by low-angle faults of probable detachment origin. Tertiary Esmeralda Formation sediments and Quaternary older alluvium cover much of the western part of the hills; a granitic body, the Weepah pluton, probably the same age as the 70 Ma Lone Mountain pluton to the northeast, crops out in a broad area in the northern hills; and a couple small patches of Precambrian Wyman Formation and Reed Dolomite poke through near the central part of the area. The rest of the area is mostly underlain by Cambrian to Ordovician sedimentary formations. Sunshine Mining Company took out a bit of gold at Weepah in the mid 80s; a few other companies have taken a look since then, but so far no additional mining has resulted.
These topo maps show the topography and main features of the area.
|The spliced Goldfield and Tonopah 30 x 60 maps (courtesy USGS).|
|The same map with a few labels.|
|Here, I've thrown on a few lineaments, including one going up Paymaster Canyon, which gives the eastern side of the Weepah Hills a linear look.|
|I'm not sure what this old sign said, but it's totally bitten the dust. And it looks like it got run over by a tracked vehicle of some sort.|
|An old, though not very old, blasting sign.|
At The Monocline, a thin, dark basalt layer caps soft, white sedimentary rocks, which, according to the Esmeralda County report, are part of the Tertiary Esmeralda Formation. These units have been tilted, maybe as much as 10 degrees.
|A closer view of The Monocline and its closer, sister hill, from Google Earth.|
|The Monocline, part of a mine dump, The Crater, and Clayton Valley playa.|
List of minerals at Weepah: Mindat.
Weepah Mine: Western Mining History (info last updated in the 80s or 90s).
Weepah Deep: unpub 1989 info from Sunshine Mining Co and FMC Gold.
Weepah Mine in the County of Esmeralda Nevada: unpub 2008 report—much of this info is good, but ignore the Regional and Local Geology sections.
Weepah Reconnaissance/Submittal Summary: unpub 2014 recon report.
Maldonado, Florian, 1984, Bedrock geologic map of the Lone Mountain pluton area, Esmeralda County, Nevada: U.S. Geological Survey Miscellaneous Investigations Series Map I-1533.
Thesis: Finding an Area
Finding a Thesis: Battle Mountain to Austin to Gabbs
Finding a Thesis: Pole Line Road
Finding a Thesis: Pole Line to Belmont
Finding a Thesis: Klondyke District
Finding a Thesis: A Joshua Tree Aside
Finding a Thesis: Into the Palmetto Mountains
Finding a Thesis: Farther into the Palmetto Mountains
Finding a Thesis: A Bit O' Geology in the Palmetto Mountains
Finding a Thesis: Future Stories from the Palmetto Mountains
Lida Summit Roadcut
Finding a Thesis: Next Stop, Silver Peak!
Finding a Thesis: Coming into Clayton Valley
Finding a Thesis: On the Southern Route to Mineral Ridge
Finding a Thesis: The Northern Route onto Mineral Ridge and a Little Geology
Finding a Thesis: Up to the Millsite and Back