Nevada Bureau of Mines and Geology - University of Nevada, Reno

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The extent of workings during Vanderburg's visit, which was a combination of the Donnelly and Reeder properties, consisted of eight adits along with lateral workings which total about 2,000 feet. During the current visit it was observed that most all of these workings were caved and have been for some time. Sample #2406 collected, and picture #7 taken here. SELECTED REFERENCES Lincoln, F.C., 1923, Mining districts and mineral resources of Nevada: Reprint 1970, Douglas McDonald pub., Verdi, NV, p. 234. Vanderburg, W.O., 1938, Reconnaissance of mining districts in Humboldt County, Nevada: U.S. Bur. Min. Infor. Circ. 1.C.-6995, pp. 20-21. Willden, R., 1964, Geology and mineral deposits of Humboldt County, Nevada: Nev. Bur. Min. Bull. 59, 154 p. Donnelly District - 2
LOCATION DUTCH FLAT DISTRICT For the purposes of this report the Dutch Flat district includes all of the southern quarter of the Hot Springs Range. This places the Dutch Flat Mine at about the north end of the district and the Red Devil Prospect at the south end. Then, there is an unnamed prospect on the south east corner. Bailey and Phoenix, and also Wilden consider the district as being only on the west slope of the range and extending from the Dutch Flat Mine south to the Red Devil Prospect. All the mines and prospects are on the Osgood Mountain 15-minute topographic map. HISTORY Placer gold was discovered in the district in 1893. It's reported that about $200,000 in gold has been produced from the placers. This figure is based on the price of gold at $35 per ounce. During the first year, production was reported to have been $75,000. Most of this gold was recovered by working with rockers. Water for the rockers was hauled in wagons from Spring Canyon, about one mile from the placer ground. The water was obtained from a well sunk to a depth of 25 feet. Since the late 1930's the placers have been worked intermittantly but not profitably. Lack of a good water supply is the main problem. Cinnabar was noted in the early placer operations, and in 1940 cinnabar was discovered in a fault zone cutting sandstone and shales. The deposits are small and only the Dutch Flat Mine has had any significant production. Total production for the district has probably not exceeded 90 flasks . GEOLOGIC SETTING The bulk of the district is composed of the Cambrian Harmony Formation which is made up of sandstone and shales. North northeasterly of the Dutch Flat Mine is a Tertiary granodiorite intrusive. A contact metamorphic aureole surrounds this intrusive and may be the source of the scheelite in the placer deposits. Asymmetrical, north plunging folds characterize the structure in the Harmony Formation, and these are cut by normal vertical faults which trend northeast and southwest. In the east, southeast portion of the district is an area covered by Tertiary basaltic and andesitic rocks. Locally this unit may include more silicic rocks and even sedimentary rocks. In the southeastern edge of the district is a small cropping of Ordovician Valmy Formation. In this area the unit is composed almost entirely of a medium grgy to white quartzite. ORE DEPOSITS Wilden and Hotz have described the ore deposits of the district as follows: "Two types of lode deposits of two ages are present in the area, Dutch Flat District - 1
Page 1 and 2: UNIVERSITY OF NEVADA RENO NBMG OPEN
Page 3 and 4: Summary of Work Performed Index Map
Page 5 and 6: ) CRIB forms containing location an
Page 7 and 8: - /-\- /- County Line SONOMA-GER LA
Page 9 and 10: ORE DEPOSITS At the Nevada-Superior
Page 11 and 12: LOCATION ANTELOPE SPRINGS DISTRICT
Page 13 and 14: LOCATION ARABIA DISTRICT The Arabia
Page 15 and 16: LOCATION AWAKENING DISTRICT The Awa
Page 17 and 18: Johnson, M. G. (1973) Placer gold d
Page 19 and 20: ORE DEPOSITS The lode deposits at t
Page 21 and 22: Needham, A. B. and Trengrove, R. R.
Page 23 and 24: (Bailey and Phoenix, 1944), and flu
Page 25 and 26: ORE DEPOSITS Only two areas of mine
Page 27 and 28: LOCATION BOTTLE CREEK DISTRICT The
Page 29 and 30: the sheared rhyolite. Workings are
Page 31 and 32: quartz monzonite intrude the Havall
Page 33 and 34: Something less than 1/2 mile south-
Page 35 and 36: LOCATION DEEPHOLE DISTRICT The Deep
Page 37 and 38: adit driven into the pendant(?). If
Page 39 and 40: GEOCHEMICAL RELATIONSHIPS Gold was
Page 41 and 42: displacement in excess of 2,000 fee
Page 43: LOCATION DONNELLY DISTRICT The Donn
Page 47 and 48: SELECTED REFERENCES Bailey, E. H. a
Page 49 and 50: ORE DEPOSITS Most of the mineraliza
Page 51 and 52: shale with lesser carbonaceous lime
Page 53 and 54: Crone, W. R. (1982) The use of Fe/M
Page 55 and 56: mercury mines are of the opalite ty
Page 57 and 58: LOCATION GOLD RUN DISTRICT The Gold
Page 59 and 60: SELECTED REFERENCES Couch, B. F. an
Page 61 and 62: At the Gayer-Moo property, very spa
Page 63 and 64: Mineralization in the district appe
Page 65 and 66: and dip steeply to the vest. .... A
Page 67 and 68: LOCATION IMLAY DISTRICT The Imlay d
Page 69 and 70: apparently did not contain cinnabar
Page 71 and 72: LOCATION INDIAN DISTRICT The Indian
Page 73 and 74: LOCATION IRON HAT DISTRICT The Iron
Page 75 and 76: Southern Pacific Co. (1964) Mineral
Page 77 and 78: silver per ton and a trace gold. Ho
Page 79 and 80: LOCATION JACKSON MOUNTAINS DISTRICT
Page 81 and 82: SELECTED REFERENCES Lincoln, F. C.
Page 83 and 84: of manganese oxides occur in rocks
Page 85 and 86: andesitic volcanic rocks that have
Page 87 and 88: LOCATION JUNCO AREA For the purpose
Page 89 and 90: LOCATION JUNIPER RANGE DISTRICT The
Page 91 and 92: LOCATION KENNEDY DISTRICT The Kenne
Page 93 and 94: Borlaasca Mines are along the main
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LOCATION LkKE DISTRICT The Lake dis
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Willden, R., and Speed, R. C. (1974
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Northwest of Leadville, approximate
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LOCATION LEONARD CREEK DISTRICT The
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from 3.8 to 140 ppm gold. Silver va
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ORE DEPOSITS The mineral deposits a
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LOCATION MILL CITY (CENTRAL) MINING
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present, and all samples showed det
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GEOCHEMISTRY In addition to iron th
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ORE DEPOSITS The mercury deposits a
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Papke, K. G. (1979) Fluorspar in Ne
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SELECTED REFERENCES Johnson, M. G.
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minor amounts of tremolite, pyrrhot
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LOCATION OPALITE (CORDERO) DISTRICT
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McKee, E. 8. (1976) Origin of the M
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LOCATION POTOSI MINING DISTRICT The
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has been mined from two localities
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LOCATION POVERTY PEAK DISTRICT The
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In 1954 Sonoma Mines, Inc. acquired
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LOCATION RABBIT HOLE DISTRICT The R
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LOCATION RAGGED TOP DISTRICT The Ra
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Vanderburg, W. 0. (1936) Reconnaiss
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quartz is commonly crushed and occu
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In the south-southwest portion of t
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district, the silver-bearing quartz
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LOCATION ROSEBUD DISTRICT The Roseb
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LOCATION ROSE CREEK DISTRICT The Ro
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LOCATION RYE PATCH DISTRICT The Rye
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LOCATION SAN EMIDIO DESERT - LAKE R
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"cabin" a few hundred feet. It tren
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LOCATION SCOSSA DISTRICT The Scossa
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LOCATION SEVEN TROUGHS DISTRICT The
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tin, and one contained high molybde
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SELECTED WFERENCES Stager, H. K. (i
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LOCATION SIERRA DISTRICT The Sierra
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Jones, R. B. (1984) Directory of Ne
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of the old Spring City tovnsite. Th
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LOCATION SPRING VALLEY DISTRICT The
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LOCATION STAGGS DISTRICT The Staggs
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LOCATION STAR DISTRICT The Star dis
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of Tertiary sedimentary rocks, alth
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LOCATION TABLE MOUNTAIN DISTRICT Th
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There are two fluorspar properties
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Wallace, R. E., Silberling, N. J.,
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thrust fault separates two of these
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LOCATION TOBIN ANTI SONOMA RANGE MI
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SELECTED REFERENCES Bailey, E. H.,
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ORE DEPOSITS The tungsten deposits
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LOCATION TREGO HOT SPRINGS AREA The
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SELECTED REFERENCES Kerr, P. F. (19
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APPENDIX A
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Sample Number 492 495 Sample Descri
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Sample Number Location Sample Descr
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Sample Number 1490 Location Sample
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Sample Number Location Quad: Sulphu
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Sample Description Sample Number Lo
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Sample Number 2258 I Sample Descrip
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Sample Number Sample Description Se
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Sample Number 2319 2320 2321 2322 2
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Sample Number 2337 2340 2341 2342 2
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Sample Number 2358 2359 I I Quad Ad
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Sample Number Lccation Sample Descr
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Sample Number 2411 I UTM Sample Des
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Sample Number quad: p~ Location Don
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Sample Number Sample Description Qu
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Sample Description Sample Number 1
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Sample Number sac 2 - 31N -. R -~ 3
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Sample Number 2554 2558 2559 25hn Q
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Sample Number 2572 Location . Sampl
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Sample Number 2589 25!xL-. I Locati
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Sample Description Sample Number Lo
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Sample Number Location Quad: Sec: S
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- aJ c U .r( -d aJ L > aJ Y -4-4 M
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Sample Number 2h70 2672 Location Sa
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Sample Number Location auaa: L_ovel
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Sample Number 2719 L/ZO 2721 I uTM
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Sample Number Location I 2801 I Qua
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Sample Number 2824 2827 Location cu
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Sample Number Location Quad 3-aes t
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Sample Number 2904 2905 I Sample De
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Sample Number Location Quad: Fox Ru
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Sample Number 2937 2939 --z%42- Loc
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Sample Number 2951 Location Sample
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Sample Number 2966 2967 Location Qu
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Sample Number 2982 1 aul Railroad P
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Sample Description I I Sample Numbe
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Element Semi-Quantitative Spectrogr
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Element Semi-Quantitative Spectrogr
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Element Fe % (.05) Mg % (.02) Ca %
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- , Semi-Quantitative Spectrographi
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1 ' I Element Fe % ( 05) Mg % ( 02)
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Element Fe % ( 05) Mg % ( 02) Ca %
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. Semi-Quantitative Spectrographic
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ilement r05) "' rO2) ca "5) Ti b02)
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, Semi-Quantitative Spectrographic
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Element Fe % (.05) Mg % (.02) Ca %
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! Element Fe % (.05) Mg % (.02) - C
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Semi-Quantitative Spectrographic An
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'"05) " "2) 'a r05) Ti i!O02) hl n
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- Semi-Quantitative Spectrographic
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. Semi-Quantitative Spectrographic
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Element Sr (100) i v 1 (1 01 W (50)
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Nevada Bureau of Mines and Geology - University of Nevada, Reno

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