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Engles Mine, Lights Creek Copper deposits (Moonlight Mine; Sulfide Ridge deposits; Lights Canyon deposits), Moonlight Peak, Taylorsville District, Plumas Copper Belt, Plumas Co., California, USA

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Latitude & Longitude (WGS84): 40° 12' 11'' North , 120° 46' 28'' West
Latitude & Longitude (decimal): 40.20306,-120.77444

A former Cu-Au-Ag-Zn mine located 6.9 km (4.3 miles) SE of Moonlight Peak.

Mineralization is a fissure Cu-Au-Ag-Zn deposit. The ore body strikes N60E and dips very steep N at a width of 36.58 meters. Controls for ore emplacement were shear zones in andesite porphyry and diorite. Local rocks include Mesozoic granitic rocks, unit 3 (Sierra Nevada, Death Valley area, Northern Mojave Desert and Transverse Ranges).

Local structures include a fault plane striking N30W, and dipping 60SW, with a vertical throw. The section S of the fault is oxidized.

The Engel Mine area is a part of the Diamond Mountain block, with a width of 20 miles, and a length of over 50 miles. The block has a NW-SE trend and is bounded by a prominent escarpment on the E side. The principal rocks are plutonic, varying from gabbro-diorites to true granites with associated dike rocks. Older plutonic rocks, gabbro, diorite and quartz. The diorites are part of a large batholith of which the western border appears in the Engel Mine area. Other plutonic rocks occur as two stocks. One is predominently of quartz monzonite, while the other is a true granite. Older rocks are more basic, younger rock more acidic. Two types of pre-plutonic rocks are present. The older type is predominently rhyolitic, forming a series of tuffs, the younger type is an intrusive andesite porphyry. The ages of the plutonic rocks are suggested to be late Jurassic. The rhyolite and andesite porphyry are suggested to be Carboniferous.
Comments on the workings information

Workings include underground openings. These workings achieved a vertical depth of over 1,300 feet with 10 levels. There were a numerous amount of workings at the end of 1916. 14,000 feet of development work had been done. In 1927, the following development was done: 8,161 feet of drifts, 4,667 feet of raises, a 78 foot deep shaft and 19,980 feet of diamond drilling.

Production in 1918 was about 9,100,000 pounds of Cu.

Reserves and resources in 1927 were estimated at 352,000 metric tons of ore. Cu at 2.000000 wt-pct (1927).

Mineral List

23 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Tertiary - Lopingian
2.588 - 259.9 Ma
Mesozoic granitic rocks, unit 3 (Sierra Nevada, Death Valley area, Northern Mojave Desert and Transverse Ranges)

Age: Phanerozoic (2.588 - 259.9 Ma)

Stratigraphic Name: Atolia Quartz Monzonite; Coxcomb Granodiorite; Holcomb Quartz Monzonite; Lar Quartz Diorite; Liebre Quartz Monzonite; Mount Pinos Granite; Palms Granite; Sands Granite; Teutonia Quartz Monzonite; White Tank Quartz Monzonite; Vermont Quartz Diorite; Cadiz Valley Batholith; Barcroft Granodiorite; Bass Lake Tonalite; Big Baldy Granite; Boundary Peak Granite; Bridalveil Granite; Burnside Lake Adamellite; Cabin Granodiorite; Cactus Point Granite; Carson Pass Tonalite; Cathedral Peak Granite; Clover Creek Granodiorite; Cottonwood Adamellite; Cow Creek Granodiorite; Dinkey Creek Granodiorite; Ebbetts Pass Granodiorite; El Capitan Granite; Evolution Basin Alaskite; Giant Forest Granodiorite; Half Dome Quartz Monzonite; Hunter Mountain Quartz Monzonite; Inconsolable Granodiorite; Isabella Granodiorite; Johnson Granite Porphyry; Knowles Granodiorite; Lake Edison Granodiorite; Lamarck Granodiorite; Leaning Tower Quartz Monzonite; Lebec Quartz Monzonite; Leidy Adamellite; Lodgepole Granite; Lookout Peak Tonalite; McAfee Adamellite; Mitchell Peak Granodiorite; Mono Creek Granite; Mount Clark Granite; Mount Givens Granodiorite; Pear Lake Quartz Monzonite; Paradise Granodiorite; Pellesier Granite; Pohono Granodiorite; Potwisha Quartz Diorite; Round Valley Peak Granodiorite; Sacatar Quartz Diorite; Sage Hen Adamellite; Sentinel Granodiorite; Stanislaus Meadow Adamellite; Taft Granite; Tamarack Leuco-Adamellite; Tejon Lookout Granite; Tinemaha Granodiorite; Tungsten Hills Quartz Monzonite; Ward Mountain Trondhjemite; Weaver Lake Quartz Monzonite; Wheeler Crest Quartz Monzonite; Whitney Granodiorite. Hunter Mountain Batholith; Inyo Batholith; Sierra Nevada Batholith. Bald Rock Pluton; Bucks Lake Pluton; Bullfrog Pluton; Cartridge Pass Pluton; Cascade Pluton; Dragon Pluton; Grizzly Pluton; Independence Pluton; Merrimac Pluton; Paiute Monument Pluton; Papoose Flat Pluton; Pat Keyes Pluton; Sage Hen Flat Pluton; Santa Rita Flat Pluton; Swedes Flat Pluton; Tuolumne Intrusive Suite; John Muir Intrusive Suite; Shaver Intrusive Suite; Palisade Crest Intrusive Suite; Scheelite Intrusive Suite; Fine Gold Intrusive Suite; Soldier Pass Intrusive Suite; Mount Whitney Intrusive Suite

Description: Mesozoic granite, quartz monzonite, granodiorite, and quartz diorite

Comments: Sierra Nevada, Death Valley area, Transverse Ranges and Mojave Desert. Primarily granodiorite, tonalite, quartz monzonite, and granite ranging in age from Late Triassic to Late Cretaceous. Includes some rocks as old as Permian and possibly a few as young as Tertiary. Three main periods of emplacement (Triassic, Jurassic, and Cretaceous); wide variety of rock types

Lithology: Major:{granodiorite}, Minor:{granite,tonalite,quartz diorite,quartz monzonite}, Incidental:{diorite, quartz syenite, quartz monzodiorite, gabbro, trondhjemite, monzonite, monzodiorite, pegmatite, alaskite, aplite}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

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Dana, Edward Salisbury (1892), System of mineralogy, 6th. ed., 1134 pp., Wiley & Sons, New York: 1096.

Diller, J.S. (1905), Mineral resources of the Indian Valley region, California, USGDS Bulletin 260: 47.

Kunz, George Frederick (1905a), Gems, jewelers’ materials, and ornamental stones of California: California Division Mines Bulletin 37, 171 pp.: 102.

Turner, Henry Ward & A.F. Rogers (1914), A geologic and microscopic study of a magmatic copper sulphide deposit in Plumas County, California, and its modification by ascending secondary enrichment: Economic Geology: 9: 373, 377, 379.

Rogers, Austin Flint (1916), The so-called graphic intergrowth of bornite and chalcocite: Economic Geology: 11: 587.

Graton, Louis Caryl & D.H. McLaughlin (1917), Ore deposition and enrichment at Engels, California: Economic Geology: 12: 15, 18, 19, 20, 34.

Knopf, Adolf & Charles A. Anderson (1930), The Engels copper deposits, California: Economic Geology: 25: 14-35; […Geol. Zentralbl., Band 42: 366 (1930)]: 27, 30.

Nelson, W.I. (1930), Mining Methods and Costs at the Engles Mine,
Plumas County, California, U.S. Bureau of Mines Information Circular 6260, 23p.

Anderson, Charles A. (1931a), The geology of the Engels and Superior mines, Plumas Co., California, with a note on the ore deposits of the Superior mine: University of California, Department of Geological Science Bulletin: 20: 321.

Averill, Charles V. (1937), Mineral resources of Plumas County: California Division Mines Report 33: 93-98.

Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged, 834pp.: 196, 539.

Gentry, G.G. (1952), Engle Mine, Plumas County, California; U.S. Bureau of Mines, DMEA Report 2161. 12p.

Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 71, 79, 111, 114, 130, 133, 144, 161, 175, 176, 219, 226, 238, 253, 277, 295, 332, 337, 352, 364, 366.

Smith, A.R. (1970) Trace elements in the Plumas Copper Belt, Plumas County, California. California Division of Mines and Geology Special Report 103: 3-26.

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 88 (map 3-3), 90, 94, 97, 99, 136, 150, 161, 173, 298, 370, 372, 377, 380, 384, 490, 514.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10034127, 10109418 & 10261965.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060630

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