Gold Districts of California
Location. This district lies astride the Shasta-Trinity County line in the
general vicinity of the town of French Gulch and includes the Deadwood area to the west.
It is the most important lode-gold district in the Klamath Mountains.
History. French Gulch was originally prospected in 1849 by French miners, from
whom the town received its name in 1856. Clear Creek, which drains the area, yielded large
amounts of placer gold at this time. The Washington mine, discovered in 1852, was the
first quartz mine worked in Shasta County. From around 1900 to about 1914 the output for
the district averaged between $300,000 and $500,000 worth of gold per year. There was some
activity during the 1920s and 1930s, and there has been minor prospecting and development
work since. The value of the total output of the district is estimated at more than $30
Geology. The district is underlain predominantly by slate, shale, and siltstone
of the Bragdon Formation (Mississippian). Copley Greenstone (Devonian) lies to the
northeast and south, and, to the southwest, there is quartz diorite of the Shasta Bally
batholith. In addition, numerous porphyritic quartz diorite and diorite dikes, locally
known as "birdseye porphyry", occur.
Ore Deposits. The quartz veins usually strike west, with a few northwest
exceptions, and range from a few inches to several feet thick. They are predominantly in
the rocks of the Bragdon Formation and often occur near or adjacent to the dikes, which
apparently have had some effect on the localization of the ore bodies. The latter consist
of numerous parallel stringers rather than a single massive vein. Calcite is commonly
present in the veins. The ore contains coarse, free gold usually associated with
considerable pyrite and smaller amounts of galena, sphalerite, arsenopyrite, chalcopyrite,
and occasionally scheelite. Numerous high-grade pockets have been recovered here. A number
of large ore bodies occur in the district, several of which were more than 1000 feet long.
Mines. Accident, American $300,000, Army Batch, Blue Jay, Bright Star, Brown
Bear $15 million, Brunswick $100,000, Calmich, Centennial, El Dorado, Fairview $200,000,
Gambrinus $125,000, Gladstone $6.9 million, Henry Clay $100,000 to $300,000, Highland
$300,000, Honeycomb, Jacoby, J.I.C., Larry, Mad Mule $1 million, Mad Ox $500,000, Milkmaid
and Franklin $2.5 million, Montezuma 7,150+ ounces, Mt. Shasta 8,500 ounces, Niagara $1
million, Niagara Summit, Philadelphia, St. Jude $280,000+, Scorpion 7,140 ounces, Summit
$200,000, Sybel $600,000, Three Sisters $100,000, Tom Green, Truscott, Venecia $500,000,
Vermont and Montezuma, Washington $2.5 million.
Excerpt from: Gold Districts of California, by: W.B. Clark, California
Department of Conservation, Division of Mines and Geology, Bulletin 193, 1970.
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