Nevada State Metal – Silver
With regard to the Comstock Lode, gold, having been discovered at the head of Six-Mile Canyon, Nevada, in 1859, was the first target of miners, but it soon became apparent that the real mineral of importance in the area was silver.
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Delaware State Mineral – Sillimanite
In 1977, the Delaware General Assembly, acting on a proposal by the Delaware Mineralogical Society, established sillimanite as the Delaware State Mineral.
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Illinois State Mineral – Flourite
Fluorite melts at low temperatures and flows through other minerals, such as limestone, which is where it gets its name.
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Nevada Mines Map
The Nevada Mines Map shows the location of the primary minerals that are mined in Nevada for industrial use.
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Historic California Gold Rush Map
In recognition of the California Gold Discovery to Statehood Sesquicentennial (1998-2000) CGS produced the “Map of California Historic Gold Mines” (MM 009) as a poster at the scale of 1:1,500,000. The map shows the location of 13,500 historic California gold mines.
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Benitoite – California State Gem
Benitoite was discovered in 1906 by J.M. Couch at the now well-known Benitoite Gem Mine in San Benito County. The mineral was thought to be sapphire, but jewelers determined that it wasn’t.
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