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“Bite-Size Bits of Local, National, and Global History”
“Bite-Size Bits of Local, National, and Global History”
San Jose in Santa Clara County, California — The American West (Pacific Coastal)
 

Shaker-Concentrator

 
 
Shaker-Concentrator Marker image. Click for full size.
By Barry Swackhamer, November 17, 2011
1. Shaker-Concentrator Marker
Inscription. The shaker-concentrator, also known as a shaker table, was used in gravity beneficiation (the concentration of ore) for sorting fine-grained materials, such as heavy cinnabar, from ordinary rock and dust particles. The beneficiation process was carried out on the surface of the shaker bed, which has a slight tilt. The particles to be separated were fed into the shaker from a trough above the bed. At the same time water was applied to the bed from a tank (or simply a garden hose). Due to combination of gravity, inertia, friction and horizontal flow of water, the particles were stratified according to weight and size; heavier material (in the case of cinnabar) moved slower that lighter material, and thus the material were separated.

The exact use of this concentrator from the Guadalupe mine is not known. Concentrators were sometimes used to separate free mercury from the dust captured in the cyclone collector at the output of the rotary furnace or heavy cinnabar from the dust of crushed rock. Old dump rock discarded by miners in the 1800ís was, in their opinion, low-grade ore. In the 1900ís the low-grade rock was considered valuable. The crushing of old dump rock and the concentration of fine rock was often tried, but with mixed results. After 1942, hand sorting and roasting the old rock in rotary furnaces proved to be more economical.
 
Erected 2011 by The California State Society, Daughters of the American Revolution and New Almaden Quicksilver County Park Association.
 
Marker series.
Shaker-Concentrator Marker image. Click for full size.
By Barry Swackhamer, November 17, 2011
2. Shaker-Concentrator Marker
This marker is included in the Daughters of the American Revolution marker series.
 
Location. 37° 10.403′ N, 121° 49.575′ W. Marker is in San Jose, California, in Santa Clara County. Marker can be reached from Almaden Road. Touch for map. The Hacienda Mining Display is a short walk on the Deep Gulch Trail from the Almaden Quicksilver County Park parking lot. Marker is at or near this postal address: 21731 Almaden Road, San Jose CA 95120, United States of America.
 
Other nearby markers. At least 8 other markers are within walking distance of this marker. D Retort and Condensing System (here, next to this marker); Mercury Storage Vault (here, next to this marker); Hoeing Table and Cleaning Tank (here, next to this marker); Gould Rotary Furnace and Condensing System (here, next to this marker); Cornish Pump (here, next to this marker); Skip Loader (a few steps from this marker); Hacienda Mining Display (a few steps from this marker); Mine Air Compressors (a few steps from this marker). Touch for a list and map of all markers in San Jose.
 
Categories. Industry & CommerceNatural Resources
 
Shaker-Concentrator image. Click for full size.
By Barry Swackhamer, November 17, 2011
3. Shaker-Concentrator
Hacienda Mining Display image. Click for full size.
By Barry Swackhamer, November 17, 2011
4. Hacienda Mining Display
 
 
Credits. This page was last revised on June 16, 2016. This page originally submitted on November 26, 2011, by Barry Swackhamer of San Jose, California. This page has been viewed 316 times since then and 38 times this year. Photos:   1, 2, 3, 4. submitted on November 26, 2011, by Barry Swackhamer of San Jose, California. • Syd Whittle was the editor who published this page.
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