Hall Mine

Hall Mine Hillsboro Mining District South side of Percha Box Sierra County, NM, USA

Hall Mine Labeled

The current name for this mine, which is located on the south rim of the Percha Box east of Hillsboro, New Mexico, is the Hall Mine.  In the past it was also referred to as the Macy Mine and as the S. J. Macy Claim.  As such it was probably associated with the Vanadinite Mine which is in the vicinity (but on the north rim of the Percha Box).

The trail to the mine (see right) follows an old mining road which starts in Ready Pay Gulch south of NM-152.  This walk is 1.67 miles each way and has the elevation gradient shown below.  The background of the route markings  are from Google Earth with an overlay of the Hillsboro Quadrangle Geologic Map.  The geologic overlay shows that the route starts in an IPm unit, crosses units of Trp, Om, Qao2, and Qay, before arriving at the DP unit where the Hall Mine is located.

Western Mining History lists lead as the primary mineral from the mine with Zinc, Vanadium, Silver, and Copper being listed as secondary minerals.  Mindat list vanadium ores for the mine.  Diggings lists vanadium as the major mineral of interest from the mine with lead and zinc deposits listed as well.

Diggings list the age of the host rock for the mine as late Silurian, this is the Dp unit.  The mineralization occurred in Pliocene rock, probably in a fissure.

At page 276, Lindgren et al. (The Ore Deposits of New Mexico, 1910) notes that “Some vanadium ore is said to have been produced in the Hall mine.”

Harley, in The Geology and Ore Deposits of Sierra County (Bulletin 10) describes the host rock (Dp being Percha Shale) as follows:  “Percha Shale.—Overlying the Fusselman limestone and in unconformable contact with it is the Percha shale of Devonian age, which is 200 to 250 feet thick. It consists of a lower greenish-black part barren of fossils, and an upper  grayish or light greenish-gray part. The outcrops of the Percha shale are restricted to two or three small residual patches on the dip slope of the Fusselman limestone, and to a larger area about half a mile south of the Rio Percha and about due south of the S. J. Macy vanadium mine. Where this formation overlies the silicified Fusselman limestone, the base is silicified and converted to a form of jasper, probably by the same solutions that silicified the underlying limestone.” (pp. 126 - 127)  He does not describe the Hall mine.

Hall Mine Elevation Profile

When I visited the mine on January 5, 2017, I found two shafts.  The photographs in this post are from the most northerly of the shafts.  It had lateral workings just a few feet below the surface.

Hall Mine Hillsboro Mining District South side of Percha Box Sierra County, NM, USA

Diggings lists the major ores as descloizite (lead and zinc vanadate), endlichite, and vanadinite.  The website states that “fissures and faults provided path for mineralized solutions emanating from shallow igneous mass.  Overlying shale formed a barrier trapping the mineral solutions”.

Hall Mine Hillsboro Mining District South side of Percha Box Sierra County, NM, USA

© Robert Barnes 2018