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Harrison Mine (New England Mine; Grizzly Mine; January Mine; Ruby Mine), Knoxville area, Knoxville District, Coast Ranges, Yolo Co., California, USA

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Harrison Mine, Knoxville area, Knoxville District, Coast Ranges, Yolo Co., California, USA 
A former Hg mine located in secs. 26 & 35, T12N, R5W, MDM, 4.0 km (2.5 miles) NW of Knoxville (Napa County) and 1 mile S of the Reed Mine. Discovered in 1868. First production was 1917. Production years included 1917-1918,, 1937-1945. Owned by V. W. Harrison and others. MRDS database stated accuracy for this location is 100 meters.

Mineralization is Pliocene in age and is hosted in Late Jurassic serpentinite. The ore body strikes N42W and dips NE at a width of 4.57 meters and a length of 15.24 meters. Controls for ore emplacement included a broad NW-trending fault zone. Franciscan sediments and serpentine constitute the major rocks of the district while Knoxville strata occur E of the ore district. These are overlain by Pleiocene- Pleistocene Sonoma volcanics, which are rhyolitic tuffs and agglomerates of basalt andesite and rhyolite. Prior to the Upper Pleiocene, the rocks were folded and faulted, giving major NW structural trends. Many of the Hg deposits occur along the flanks of a major anticline. The sediments have been hydrothermally bleached and kaolinized while the serpentine has undergone silica-carbonation. Ore bodies include those in silica carbonate rock (most abundant), bodies along faults in Franciscan sandstone, occurrences along contacts with basalt dikes, and bodies in brecciated chert. Local rocks include ultramafic rocks, chiefly Mesozoic, unit 3 (Coast Ranges and Western Klamath Mountains).

Local structures include a serpentine - Knoxville Fault contact.

Workings include underground openings with a length of 249.94 meters and an overall depth of 38.1 meters. Most of the workings are now inaccessible.

Production data are found in: U.S. Bureau of Mines file data.

Analytical data results: Assays ran to 4 pounds/ton maximum (DMEA report).

Production results: Year: 1962: Hg, estimated accuracy of ^61 pounds Hg/ton (22,560 grams/metric ton).


var: Picotite

8 entries listed. 5 valid minerals.


Becker, George F. (1888b), Geology of the quicksilver deposits of the Pacific slope: USGS Monograph 13, atlas: 233.

Aubury, Lewis E. (1903), The quicksilver resources of California: California Mining Bureau Bulletin 27: 117.

Forstner, W. (1908), Quicksilver Resources of California: California Division of Mines and Geology Bulletin 27, 270 pp.

Bradley, W.W. (1918), Quicksilver resources of California, with a section on metallurgy and ore dressing: California Mining Bureau. Bulletin 78, 389 pp.

Ransome, Alfred Leslie & J.L. Kellogg (1939), Quicksilver resources of California: California Division Mines Report 35: 353-486.

Averitt, Paul (1945), Quicksilver deposits of the Knoxville district, Napa, Yolo, and Lake Counties, California: California Division Mines Report 42: 84-88, Pl. 6.

O'Brien, J.C. (1950), Mines and Mineral Resources of Yolo County, California, California Journal of Mines and Geology (Report 46): 46(3): 433, 459-460.


Holmes, G.H. (1965) Mercury in California. US Bureau of Mines Information Circular 8252.

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 53, 125.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10040775 & 10190131.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0061130020.

Bailey, E.H., USGS, personal files.
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