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Slide of the old stamp mill, circa 1950s
Date
1950 to 1959
Archival Collection
Description
The old stamp mill, location unknown. A stamp mill (or stamp battery or stamping mill) is a type of mill machine that crushes material by pounding rather than grinding, either for further processing or for extraction of metallic ores. Breaking material down is a type of unit operation. A stamp mill consists of a set of heavy steel (iron-shod wood in some cases) stamps, loosely held vertically in a frame, in which the stamps can slide up and down. They are lifted by cams on a horizontal rotating shaft. On modern mills, the cam is arranged to lift the stamp from the side, so that it causes the stamp to rotate. This evens the wear on the shoe at the foot of the stamp. As the cam moves from under the stamp, the stamp falls onto the ore below, crushing the rock, and the lifting process is repeated at the next pass of the cam. Each one frame and stamp set is sometimes called a "battery" or, confusingly, a "stamp" and mills are sometimes categorized by how many stamps they have, i.e. a "10 stamp mill" has 10 sets. They usually are arranged linearly, but when a mill is enlarged, a new line of them may be constructed rather than extending the line. Abandoned mill sites (as documented by industrial archaeologists) will usually have linear rows of foundation sets as their most prominent visible feature as the overall apparatus can exceed 20 feet in height, requiring large foundations. Stamps are usually arranged in sets of five. Some ore processing applications used large quantities of water so some stamp mills are located near natural or artificial bodies of water. For example, the Redridge Steel Dam was built to supply stamp mills with process water.
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Slide of the Bowers Mansion, Washoe Valley, Nevada, circa 1970s
Date
1970 to 1979
Archival Collection
Description
The Bowers Mansion was built in 1863 by Lemuel "Sandy" Bowers and his wife, Eilley Orrum Bowers, and is a prime example of the homes built in Nevada by the new millionaires of the Comstock Lode mining boom. The mansion, designed by J. Neely Johnson, a builder and ex-governor of California, combined Georgian Revival and Italianate architectural styles. It was modeled after a design conceived by Eilley based on her recollection of elegant buildings in her native Scotland. Following the death of Sandy Bowers in 1868, Eilley fell on hard financial times. She generated income by renting out rooms in the mansion and hosting parties and picnics on the grounds. The mansion hosted a ball for the women's suffrage movement and was the location of the annual Miner's Ball. The period of 1873–75 was the height of the mansion's popularity. However, this was not enough to overcome Eilley's debts and she finally lost her home to foreclosure in 1876. The mansion was abandoned by the time Henry Riter acquired it and operated it as a resort until 1946. The building is currently owned and operated by the Washoe County Parks Department. Some 500 Nevada families have donated period furniture housed in the mansion. The park blends the historical site with recreational facilities such as a spring-fed swimming pool, picnic areas, and a playground. The Bowers Mansion is located in Washoe Valley, within the Bowers Mansion Regional Park at 4005 Old U.S. Highway 395 North, North Washoe Valley, Nevada.
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Slide of a tufa deposit in Pyramid Lake, Nevada, circa 1970s
Date
1970 to 1979
Archival Collection
Description
The pyramid-shaped island tufa that lies along the east shore of the lake and is the reason the lake was named Pyramid Lake. Pyramid Lake is the geographic sink of the Truckee River Basin, 40 mi (64 km) northeast of Reno. Pyramid Lake is fed by the Truckee River, which is mostly the outflow from Lake Tahoe. The Truckee River enters Pyramid Lake at its southern end. Pyramid Lake has no outlet, with water leaving only by evaporation, or sub-surface seepage (an endorheic lake). The lake has about 10% of the area of the Great Salt Lake, but it has about 25% more volume. The salinity is approximately 1/6 that of sea water. Although clear Lake Tahoe forms the headwaters that drain to Pyramid Lake, the Truckee River delivers more turbid waters to Pyramid Lake after traversing the steep Sierra terrain and collecting moderately high silt-loaded surface runoff. Pyramid Lake is the site of some of the Earth's most spectacular tufa deposits. Tufa is a rock composed of calcium carbonate (CaCO3) that forms at the mouth of a spring, from lake water, or from a mixture of spring and lake water. The explorer John C. Fremont (1845) wrote about the tufas during his 1843-44 expedition and named the lake after the pyramidal-shaped island that lies along the east shore of the lake. The Paiute name for the island is Wono, meaning cone-shaped basket. The Paiute name for the lake is Cui-Ui Panunadu, meaning fish in standing water.
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