Cinnabar City Mine (King George Mine), Spring Valley District, Humboldt Range, Pershing Co., Nevada, USA
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|Latitude & Longitude (WGS84):||40° 18' 46'' North , 118° 5' 49'' West|
|Latitude & Longitude (decimal):||40.3127777778, -118.096944444|
Sec 1 T28N R34E
The Cinnabar City mine was a relatively small producer but is noted for very coarse cinnabar. To refer to this place as a "City", in any sense of the word, suggests delusions of grandeur. The mine is located near the head, the southern end, of a small, north-south oriented canyon. It is approximately 3 miles northeast of the large open pit silver - gold mine centered on Nenzel Hill that was begun by Coeur Rochester in 1986. It is one of a number of mercury mines that dot the periphery of the Rochester District.
At Cinnabar City the bedrock is folded Triassic age limestone that dips east. The ridge on the east side of the canyon is capped by Pliocene age basaltic tuff and basalt flows. The limestone immediately underlying the tuff is a rubbly breccia with tuff in the interstices.
The limestone country rock is transected by high angle calcite veins. The small orebody worked by the Cinnabar City mine is located where one of these calcite veins is truncated by the contact with the overlying tuff. Although the calcite vein does not extend into then tuff and basalt, sparse cinnabar does occur in the tuff above the ore shoot. This suggests that deposition occurred in a very shallow hot spring environment. For the most part deposition immediately preceded the eruption of the basaltic tuff and flows but the waning stages continued after deposition of the tuff. Therefore, mineralization is no older than Pliocene.
Ore came from a single stope and seems to have been very high grade containing very coarse masses of cinnabar in calcite. Production totaled less than 350 flasks.
In October, 1975, when this author visited the locality there were a number of small buildings still standing (site photo) and the mill, up on the hillside, was mostly intact. In some recent photographs seen on the internet the buildings are now gone and the mill is a badly shattered ruin. The red Federal Motor Company truck is still visible in the recent photo's. It appears more faded than 40 years ago and I suspect there are more bullet holes than there were then.
6 valid minerals.
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Bailey and Phoenix (1944), Quicksilver Deposits in Nevada, Nevada Bureau of Mines and Geology, Bulletin 41.