geologic map of the castle mountains, san...

1
QUATERNARY AND TERTIARY DEPOSITS Undifferentiated stream channel deposits Unconsolidated older stream sediment and flood deposits Undifferentiated unconsolidated and calichified pediment and elevated terrace sediments and colluvium Carbonate deposits TERTIARY ROCKS ASSOCIATED WITH AREAS OF MINERALIZATION AND ALTERATION Quartz veins Hydrothermal Breccia Late Early TERTIARY INTRUSIVE ROCKS Diorite sills and dikes Andesite and mafic dikes and plugs Pyroclastic dikes and sills Phenocryst-poor rhyolite dikes Porphyritic rhyolite dikes TERTIARY PIUTE RANGE VOLCANIC ROCKS (PRV) Trachyandesite flows Andesitic agglomerate and volcanic breccia Dacite Volcaniclastic rocks Lahars, debris flows, mudflows, and epiclastic rocks Upper lahars (see JSLA pit map) Lower lahars (see JSLA pit map) Upper Egg Hill debris flows (see JSLA pit map) Lower Egg Hill debris flows (see JSLA pit map) Rhyolite tuff TERTIARY BOULDER CONGLOMERATE AND RELATED ROCKS Boulder conglomerate Arkose (see JSLA pit map) TERTIARY CASTLE MOUNTAINS VOLCANIC SEQUENCE (CMV) Rocks of Hart Peak Trachyandesite and trachydacite flows and domes Trachyandesite and trachydacite dikes and sills Rhyolite flows Rhyolite intrusions Welded rhyolite ash-flow tuff Basalt and trachyandesite Poorly welded rhyolite tuff Volcaniclastic rocks Rocks of Linder Peak Rhyolite pyroclastic-surge tuff and volcaniclastic rocks Cognate-lithic dominant Accidental-lithic dominant Leached-clast bearing vent breccia Rhyolite autoclastic breccias, dome-related block and ash flows, and blocky pumice flows Phenocryst-poor rhyolite Phenocryst-rich rhyolite Late phenocryst-poor rhyolite Rocks of Jacks Well Phenocryst-rich welded rhyolite ash-flow tuff Arkose, mudstone, claystone, and gravel Trachyandesite and minor basalt flows Epiclastic rocks, debris flows, lahars, mudflows, and minor andesitic flow rocks Poorly welded rhyolite tuff Andesitic lithic tuff breccia Basalt and basaltic-andesite flows PEACH SPRINGS TUFF Peach Springs Tuff PREVOLCANIC SEDIMENTARY ROCKS Prevolcanic sedimentary rocks PALEOZOIC ROCKS Paleozoic limestone PROTEROZOIC ROCKS Granite Amphibolite Pegmatite and alaskite Gneiss Well developed schistosity Poorly developed schistosity Tca QTs Qso Qs Tip Tia Tid Tib2 Tib1 Tqz Tipr Tpa Tpag Tpd Tpvs Tpl Tir Tplu Tpll Tpeu Tpel Tpt Tbc Ta Tha Tiha Thr Tihr Thw Thb Tht Thv Tlt Tlbx Tl Tlp Tll Tjw Tjs Tja Tjc Tjt Tjat Tjb Tps Tc Cl Xgr Xa Xp Xg Xgl Xgc Tltc Tlta Tltl MAP 108 GEOLOGIC MAP OF THE CASTLE MOUNTAINS, SAN BERNARDINO COUNTY, CALIFORNIA AND CLARK COUNTY, NEVADA Prepared in cooperation with the California Division of Mines NEVADA BUREAU OF MINES AND GEOLOGY Field work done from 1987 to 1994. Office review by: Ernest Duebendorfer, Northern Arizona University Christopher Henry, NBMG Eugene Smith, UNLV Jon Spencer, Arizona Geological Survey Steve Weiss, Mackay School of Mines Field review by: Christopher Henry, NBMG Eugene Smith, UNLV Steve Weiss, Mackay School of Mines First edition, first printing, 1997 Printed by Banner Printing, Sparks, Nevada Edited by Dick Meeuwig Cartography by Robert Chaney Geologic mapping and printing was supported by Viceroy Gold Corporation. Nevada Bureau of Mines and Geology University of Nevada, Mail Stop 178 Reno, Nevada 89557-0088 Regional Lithologic Map Geologic Map of the Jumbo South–Lesley Ann (JSLA) Pit GEOLOGIC MAP OF THE CASTLE MOUNTAINS, SAN BERNARDINO COUNTY, CALIFORNIA AND CLARK COUNTY, NEVADA Richard C. Capps 1997 0 0.5 1 kilometer 0 0.5 1 mile 0 4000 5000 feet 2000 1000 3000 Scale 1:24,000 See accompanying text for references and a discussion of the geology and gold mineralization of the Castle Mountains. CONTOUR INTERVAL 10 METERS Base map: U.S. Geological Survey 7.5' Quadrangles, Crescent Peak, 1984, Hopps Well, 1984, Castle Peaks, 1984, Hart Peak,1984, Grotto Hills, 1984, and East of Grotto Hills, 1984. 4380 4380 4600 4400 4400 4500 4500 4600 QTs "Jumbo Dome" Tpeu Tpll Tl Tl Tl Tl Tl Tl Ta Tlbx Tlbx Tlbx Tpeu Tpt Tpt Tpt Tpt Tpt Tpt QTs fractures dip 43° to 89° Tpeu Tpeu Ta Tl Tl Tplu Tplu Tplu Tpeu Tplu Tpll Tltl Tib1 Tib1 Tib1 Tlta Tl Tl Tl Tl Tltl Tib1 Tib1 Tbc Tbc Tpt Tib1 Tib2 Tpll Tib1 Tib2 Tplu Tltl Tltl QTs fractures dip 70° to 89° SE Tib1 Tl Tl Tib1 Tib1 Tib1 Tib1 Tib1 Tlbx Tlbx Tlbx Tlta Tib2 Tlta Tlbx Tlp QTs Tlp Tlta Tib1 Tib1 Tltl Tltl Tl Tl Tl Tpel Tpt Tpt Tpt Tpeu Tpel QTs Tib1 Tib2 Tib1 Tlta Tib1 Valley View Mine 0 300 feet 0 100 meters 30 70 85 61 25 65 60 70 80 22 71 75 74 86 85 58 32 45 24 39 74 20 29 35 58 58 89 10 20 10 4 30 20 65 72 30 43 40 54 68 56 67 65 89 83 25 88 Tpel N105000, E101400 N105000, E103600 N103400, E103600 N103400, E101400 164 C a lifo r n ia Nevada Map Area 10 0 kilometers Tertiary Mesozoic Mesozoic-Paleozoic Proterozoic Basaltic and andesitic rocks Granitoid rocks Rhyolitic, trachytic, and latitic rocks Marine sediments and minor volcanic rocks Metamorphic rocks - gneiss, schist, amphibolite, and pegmatites Nipton Woods Mountains Hackberry Mtn Homer Mountain L a n fair V alle y N e w Y ork M ts Lanfair Buttes Castle Mts Mine Piute V alle y Ivanpah Valley C a s tl e M t s Searchlight 93 Nevada California QTs Tca Thw Tc Xg Xgl Xgc Xp Xa Cl Xgr Tjw Tjt Tps Tlt Tltc Tlta Tlbx Tl Tlp Tjs Tjc Tja Tjat Tjb Tll Tha Tltl Thb Tht Thv Thr Tip Tipr Tir Tqz Tib2 Tib1 Tpeu Tia Tia Tid Tiha Tihr Tpel Ta Tpa Tpag Tpvs Tpl Tplu Tpll Tpt Tpd Tbc Qs Qso Surficial Deposits Source unknown Source unknown; possibly locally associated with Thr Source unknown; at least 3 thin tuffs interbedded within rocks of Jacks Well Possible source near Kingman, AZ Ash-Flow Tuffs and Related Rocks Domes, Lavas, and Related Rocks Regional Debris Flows and Related Rocks Intrusive Rocks QUATERNARY TERTIARY PROTEROZOIC PALEOZOIC Prevolcanic Sedimentary Rocks Pre-Tertiary Rocks Rocks Associated with Mineralization and Alteration Bedded Rocks Dome Lavas Thb Xgr QTs Qs Xg Thv Tps Tps Tps Tps Tps Thr Thr Tht Tht Tlbx Tlt Tlt Tlt Tjb Qs Qs QTs Tjc Tjc Tjc Tl Tl Tl Tjb Tjb Tjb Tjb Tjc Tjc Tjc Tps Tps Tps Tl Xgc Xgc Tja QTs QTs Qs Qs Cl Xgl Xgc Tqz Tqz Xgc Tlp Tia Tlt Tlt Tjb Tjc Tjw Tl Tps Xg QTs QTs Thb Tbc Xg Tjb Tjc Tlt Tlt Tlt Thv Thb Tbc Tpa Tpd Thv Tjw Tjw Tps Tps Tjc Thv Thb Tbc QTs Tpa Tjw Tps Xg Tpa Tl Tps Tlp Xg Xg Xg Hart Fault Tjc Thb Xg Section C - C' A' meters 1500 1000 500 A meters 1500 1000 500 California Nevada California Nevada Tbc Thb Tc Tps Xg Xg QTs QTs QTs QTs QTs Thv Tjc Tjc Tjc Tbc Tjt Tjt Tjt Tjc Tjc Tjc Tlt Tlt Tlt Tl Tl Tl Jumbo South deposit Lesley Ann deposit Section C - C' Hart Fault Tltl Tltl Tl Tl Tl Tl Tl Tl QTs QTs QTs Tc Tc Tc Tc Xg Xg Xg Xg Xg Xg Xg Xg Tc Tc Tc Tc Tc Tja Tja Tja Tja Tja Tja Tjc Tjc Tja Tja Tja Tja Tjb Tjc Tlt Tlt Tlt Tps Tps Tpl Tib1 Tib2 Tib2 Tps Tps Tiha Tihr Thr Thb Tbc Tpa Tps Tps Thv Tps Tps Tps Tc Xg Tjc Tps Tpl Tpe B' meters 1500 1000 500 B meters 1500 1000 500 QTs Tjc Tjc Thr QTs Tlt Tps Tps Tja Tps Tjc Tlbx QTs Tl Tja Tja Tjc Tps Tja Tjb Tlp Tl Tl Tl Tlta QTs QTs Tl Tlt Tlt Tl Tl Tl Tlt Tjw QTs Tl Tl Tlbx Tc Tps Tjb Tjc Tjc Tlt QTs Xg QTs QTs QTs Tjc Tlbx Tlbx Tht Tht Tlt Thr Thb Section A - A' Section B - B' Thr Thb Qs Qs Qs Thb Tbc Qso Qso QTs Xgr Thv Tlt Thb Tjb Tqz Tlp Tjw Tjc Tc Tc Xg Xg Xg Tlp Tc Tc Tja Tja Tjb Tja Tjw Tps Tps Tjc Xg Tiha Xg Tps Tc Tc Tjc Tlt Tlt Tlp Tlp QTs QTs Tib1 Tc Tja Xg Tc C' meters 1500 1000 C meters 1500 1000 Qs 15 26 21 8 5 4 2 3 10 17 16 6 1 9 31 25 32 24 23 11 22 30 29 33 19 27 28 12 13 34 35 18 7 50 24 75 34 32 45 32 57 40 25 60 21 45 20 30 86 25 5 12 10 27 50 28 30 20 30 40 35 20 35 24 15 34 45 90 25 18 31 43 55 78 48 24 20 30 20 20 20 10 30 25 22 40 23 25 64 16 18 34 45 55 45 50 35 10 65 20 31 40 25 65 21 80 19 70 12 44 28 24 14 14 80 82 70 54 45 35 60 20 32 16 15 30 25 43 70 71 35 60 38 41 62 75 60 60 70 89 25 65 60 40 40 70 45 60 89 80 10 75 68 80 50 66 77 78 88 62 83 20 20 40 50 12 16 15 10 10 5 17 12 10 20 31 25 5 3 15 65 5 5 5 25 50 30 22 20 55 50 48 25 40 24 20 15 33 3 28 39 30 28 25 20 25 18 25 22 25 30 78 87 60 20 24 20 34 36 16 19 20 32 35 15 30 45 25 28 19 25 15 25 15 28 20 37 20 30 64 10 6 41 40 32 34 45 5 31 12 9 25 38 11 30 20 15 15 12 79 9 75 78 42 30 35 20 32 4 8 6 19 26 15 7 2 21 24 28 25 40 14 47 34 30 50 40 50 29 50 24 14 44 45 27 5 32 7 15 10 36 16 30 28 32 30 20 5 45 25 12 23 32 10 10 32 35 15 25 20 20 5 30 55 25 28 10 49 45 64 56 26 40 4 15 20 24 12 75 24 29 89 58 88 40 34 60 45 35 23 32 18 12 29 C' A B B' A' C 115°07'30" 115°05'00" 35°20'00" 35°22'30" 115°00'00" 115°02'30" 115°05'00" 115°07'30" 35°22'30" 35°20'00" 35°17'30" 35°15'00" 70 43 20 24 ? Contact Dashed where approximately located. Normal fault Showing dip and lineations (defined by slickensides); ball on downthrown side; dashed where approximately located, dotted where concealed, queried where uncertain. On cross sections only, arrows show sense of displacement. Fractures Showing dip; dashed where approximately located. See JSLA pit map. Strike and dip of beds or compaction foliation in ash-flow tuff Inclined Vertical Horizontal Strike and dip of flow foliation in igneous rocks Inclined Vertical Strike and dip of foliation in Proterozoic metamorphic rocks Inclined Vertical Strike and dip of joint Inclined Sample location for age analysis 65 60 40 16 50 34 35 82 65 75 43 72 50 40 48 60 58 75 43 75 55 35 19 40 20 45 54 75 85 68 83 79 29 73 38 54 35 73 20 69 60 5 73 QTs QTs QTs Qs Qs Qs Qs Qs Qs Qs Qs Tid Qs Qs Qs Qs QTs QTs QTs QTs QTs QTs QTs QTs QTs QTs QTs QTs QTs QTs Cl QTs QTs QTs QTs QTs QTs QTs QTs QTs QTs QTs QTs QTs QTs QTs QTs QTs QTs Qs Qs Qs Qs Qs Qs Tpa Tpa Tpa Tpa Tpa Qs Qs Tpt Tpa Tpa Tpag Tpag Tpa Tpa Tbc Tbc Tbc Tbc Qs Qs Tia Qs QTs Qs Qs Qs Tc Qs Qs Qs Qs QTs QTs QTs QTs QTs QTs QTs QTs QTs QTs QTs QTs QTs QTs QTs QTs QTs QTs QTs QTs Qs Qs QTs QTs Qs Qs Qs Qs Qs Qs Qs Qs Qs Tps Tps Tc Tps Tps Tjat Tps Qs Qs Qs Qs Qs Qs Qs Qs Qs Qs Qs Qs Qs QTs QTs QTs Qso QTs Tpl Tpl Tid Thb Thb Thb Thb Thb Tpl Tja Tc Tps Xgl Xgl Xgl Xgl Xgl Xgl Xgl Xgl Xgl Xgl Xgl Xgl Xgl Xgl Xgl Xgl Xgl Xgl Xgl Xgl Xgl Xgl Xgc Xgc Xgc Xgl Xgl Xgl Xgl Xgl Xgc Xgc Xgc Xgc Xgc Xgc Xgc Xgc Xgc Xgc Xgc Xgc Xgc Xp Xp Xa Xa Xa Xa Xa Xa Xa Xa Xa Xa Xa Xa Xp Tiha Tps Tps Tps Tps Tps Tps Tps Tps Tps Tpl Tpl Tpa Tpa Tpa Tpa Tpd Tbc Tps Tps Xp Xp Xp Xp Xp Xp Xp Xp Xp Xp Xp Xp Xp Xp Xp Xgc Xa Xp Xp Xp Xp Xp Xp Xp Xp Xp Xp Xp Xp Xp Xp Tjc Tjc Tjc Tjs Tjw Thv Thv Tht Tbc Tlt Tlt Thb Thb Thv+Tht Thv+Tht Thv+Tht Thb Thb Thv Thv QTs QTs QTs QTs QTs QTs Xg Xg Qso QTs Xgr Xgr Xgr Xgr Tps Tps Tps Tht Tib1 Thb Thb Thb Thb Thb Thb Thb Thb Thb Thb Tbc Thb Thb Thb Thb Thb Thb Thb Thb Thb Thb Thb Thb Thb Thb Tbc Tbc Tbc Tbc Tbc Tca Tca Tca Tbc Tbc Thv Thv Thv Tht Tht Tht Tht Thv Thv Qs Thv Thv Thv Tpl Thv Thv Thv Thv Thv Thb Thb Thb Thb Thb Thb Thr Tihr Tihr Tihr Tihr Thr Thr Tl Tl Xg Tl Tl Tl Tl Tl Tl Tl Tl Tl Tl Tlp Tlp Tl Tl Tl Tl Tl Tl Tl Tl Tl Tl Tll Tl Tl Tl Tl Tl Tl Tl Tl Tl Tl Tl Tl Tl Tl Tl Tib1 Tib1 Tl Tl Tl Tl Tl Tl Tl Tl Tl Tl Tl Tl Tl Tia Tia Tbc Tl Tia Tia Tl Tl Tlta Tl Tl Tl Tl Tl Tl Tht Tht Tht Tht Tht Tht Tht Tht Tht Tht Tht Tht Thv Thv Thv Thw Thw Tht Tia Tia Tir Tir Tir Tir Tir Tir Tir Tia Tia Tid Tid Tia Tir Tir Tip Tir Tipr Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlbx Tlt Tlt Tlt Tlt Tlt Tlt Tlt Tlt Tlp Tlp Tlp Tlp Tlp Tlp Tlp Tlp Tlp Tlp Tlp Tlp Tlp Tlp Tlp Tip Tip Tlp Tlp Tlp Tlp Tlp Tlp Tlp Tltc Tlp Tiha Tiha Tiha Tiha Tiha Tiha Tiha Tiha Tihr Thr Thr Thr Thr Thr Thv Thb Thb Tiha Tib1 Tib1 Tiha Tiha Tlp Tlp Tlp Tlp Tlp Tlp Tl Tlp Thb Tid Tlt Tpl Tpl Tjw Tjw Tjw Tjw Tjw Tjw Tjw Tjs Tjs Tja Tja Tja Tja Tja Tja Tjs Tjs Tjs Tjs Tjs Tjs Tjs Tjs Tja Tjt Tjt Tjt Tjt Tjt Tjb Tjb Tjb Tjb Tjb Tjb Tjb Tjb Tjb Tlta Tjb Tjt Tjt Tjt Tjt Tjb Tjc Tjc Tjc Tjc Tjc Tjc Tjc Tjc Tjc Tjc Tjc Tjw Tjc Tjc Tjc Tjc Tlta Tlta Tlta Tlta Tlta Tltl Tltc Tltc Tltc Tltc Tltc Tltc Tltc Tltc Tltc Tib1 Tlta Tlta Tiha Tpl Tlta Tlta Tlta Tlta Tlta Tlta Tlta Tlta Tlta Tlta Tlta Tlta QTs Tha Tha Tca Tlta Tlta Tlta Tlta Tlta Tlta Tlta Qs QTs Qs QTs Qs QTs Tlta Tlta Thb Thv Thv Thb Thb Thv Tlta Tlta Tjc Tjc Tjc Tjc Tjc Tjc Tjw Tjw Tjt Tjs Tjs Tjs Tjs Tqz Tja Tja Tjw Tjw Tjs Tia Tjb Tjb Tjb Tjb Tjb Tjc Tjc Tjc Tjc Tjc Tir Tir Tir Tir Tir Tir Tir Tir Tir Tip Tir Tir Tir Tir Tia Tia Tia Tir Tir Tir Tir Tjc Tjc Tjc Tjc Tjt Tjb Tjb Tjb Tjb Tja Tjs Tjw Tjw Tjb Tjb Tjb Tjb Tjb Tjb Tjb Tjc Tjc Tjc Tjb Tjb Tjb Tir Tjb Tjb Tht Thb Tjs Tlt Tlt Tlt Tlt Tlt Tlt Tlt Tlt Tlt Tlt Tlt Tlt Tlt Tlt Tlt Tlt Tpt Tlp Tlp Tpd Tl Tpl Tpl Tpl Tpl Tpl Tpa Tpl Tpl Tpl Tpl Tpl Tpa Tpa Tpa Tpa Tpa Tpa Tpa Tpa Tpa Tpa Tpa Tpa Tpa Tpvs Tpa Tpa Tpag Tlt Tlt Tlt Tlt Tlt Tlt Tlt Tlt Tlt Tqz Tqz Tqz Tqz Tbc Tqz Tqz Tqz Tqz Tqz Tqz Tqz Tqz Tqz Tqz Tqz Tqz Tqz Tib1 Tlt Tlt Tlt Tlt Tlt Tlt Tlt Tlt Tlt Tlt Tlt Tlt Tlt Tlt Tlt Tlt Tlt Tlt Tlt Tlt Tlt Tlt Tlt Tl Tl Tll Tl Tl Tlt Tlt Tlt Tll Tll Tll Tll Tir Tlt Tlbx Tlt Qs Qs Qs QTs QTs QTs QTs QTs QTs Qs Qs Qso Thb Xgr QTs QTs QTs Xa Xa Xa Xa Xp Xgl Xgl Xgl Xgl Xgl Xgl Xgl Xgl Xgl Xgl Xgl Tps Thb Thb Thb Thb Xgr Tht Tbc Thb Thb Thb Thb Thb Tht Tht QTs QTs QTs QTs QTs Qs Qs Qs Qs Qs QTs QTs QTs Xgl QTs Tip Tia Xgl Xgl Thb Xgr Tlt Tlt Tlt Tlt Tlt Tlt Tlt Tlt Tl Tl Tlt Tlt Tia Tia Tia Tia Tia Tia Tia Tia Tia Tqz Tqz Tqz Tqz Tqz Tqz Tlp Tl Thb Thb Thb Thb Thv Thv Thv Thv Thv Thv Thb Thb Tja Tja Tja Tht Tht Tid Tid Tip Tlt Tlp Tlp Tid ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? R a z o r back Fa u l t JSLA PIT biotite-rich garnet-bearing opaline silica and hydrothermal breccia leucocratic baked contact zone Xgl (cataclasite) fault scarp Tca (colluvium) H a r t F a ult Piute Range "Razorback Butte" "Linder Peak" "Egg Hill" " N o rth w e st Rim " N135,000 N135,000 N125,000 N125,000 N115,000 N105,000 N95,000 E100,000 E110,000 E100,000 E110,000 E130,000 E120,000

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Page 1: GEOLOGIC MAP OF THE CASTLE MOUNTAINS, SAN …cappsgeoscience.com/wp-content/uploads/2015/07/m108plate.pdf · Ash-Flow Tuffs and Related Rocks Domes, Lavas, and Related Rocks Regional

QUATERNARY AND TERTIARY DEPOSITS

Undifferentiated stream channel deposits

Unconsolidated older stream sediment and flood deposits

Undifferentiated unconsolidated and calichified pediment and elevated terrace sediments and colluvium

Carbonate deposits

TERTIARY ROCKS ASSOCIATED WITH AREAS OF MINERALIZATION AND ALTERATION

Quartz veins

Hydrothermal Breccia

Late

Early

TERTIARY INTRUSIVE ROCKS

Diorite sills and dikes

Andesite and mafic dikes and plugs

Pyroclastic dikes and sills

Phenocryst-poor rhyolite dikes

Porphyritic rhyolite dikes

TERTIARY PIUTE RANGE VOLCANIC ROCKS (PRV)

Trachyandesite flows

Andesitic agglomerate and volcanic breccia

Dacite

Volcaniclastic rocks

Lahars, debris flows, mudflows, and epiclastic rocks

Upper lahars (see JSLA pit map)

Lower lahars (see JSLA pit map)

Upper Egg Hill debris flows (see JSLA pit map)

Lower Egg Hill debris flows (see JSLA pit map)

Rhyolite tuff

TERTIARY BOULDER CONGLOMERATE AND RELATED ROCKS

Boulder conglomerate

Arkose (see JSLA pit map)

TERTIARY CASTLE MOUNTAINS VOLCANIC SEQUENCE (CMV)

Rocks of Hart Peak

Trachyandesite and trachydacite flows and domes

Trachyandesite and trachydacite dikes and sills

Rhyolite flows

Rhyolite intrusions

Welded rhyolite ash-flow tuff

Basalt and trachyandesite

Poorly welded rhyolite tuff

Volcaniclastic rocks

Rocks of Linder Peak

Rhyolite pyroclastic-surge tuff and volcaniclastic rocks

Cognate-lithic dominant

Accidental-lithic dominant

Leached-clast bearing vent breccia

Rhyolite autoclastic breccias, dome-related block and ash flows, and blocky pumice flows

Phenocryst-poor rhyolite

Phenocryst-rich rhyolite

Late phenocryst-poor rhyolite

Rocks of Jacks Well

Phenocryst-rich welded rhyolite ash-flow tuff

Arkose, mudstone, claystone, and gravel

Trachyandesite and minor basalt flows

Epiclastic rocks, debris flows, lahars, mudflows, and minor andesitic flow rocks

Poorly welded rhyolite tuff

Andesitic lithic tuff breccia

Basalt and basaltic-andesite flows

PEACH SPRINGS TUFF

Peach Springs Tuff

PREVOLCANIC SEDIMENTARY ROCKS

Prevolcanic sedimentary rocks

PALEOZOIC ROCKS

Paleozoic limestone

PROTEROZOIC ROCKS

Granite

Amphibolite

Pegmatite and alaskite

Gneiss

Well developed schistosity

Poorly developed schistosity

Tca

QTs

Qso

Qs

Tip

Tia

Tid

Tib2

Tib1

Tqz

Tipr

Tpa

Tpag

Tpd

Tpvs

Tpl

Tir

Tplu

Tpll

Tpeu

Tpel

Tpt

Tbc

Ta

Tha

Tiha

Thr

Tihr

Thw

Thb

Tht

Thv

Tlt

Tlbx

Tl

Tlp

Tll

Tjw

Tjs

Tja

Tjc

Tjt

Tjat

Tjb

Tps

Tc

Cl

Xgr

Xa

Xp

Xg

Xgl

Xgc

Tltc

Tlta

Tltl

MAP 108 GEOLOGIC MAP OF THE CASTLE MOUNTAINS, SAN BERNARDINO COUNTY, CALIFORNIA AND CLARK COUNTY, NEVADAPrepared in cooperation with the California Division of MinesNEVADA BUREAU OF MINES AND GEOLOGY

Field work done from 1987 to 1994.

Office review by: Ernest Duebendorfer, Northern Arizona University Christopher Henry, NBMG

Eugene Smith, UNLVJon Spencer, Arizona Geological Survey

Steve Weiss, Mackay School of Mines

Field review by: Christopher Henry, NBMG Eugene Smith, UNLV Steve Weiss, Mackay School of Mines

First edition, first printing, 1997Printed by Banner Printing, Sparks, NevadaEdited by Dick MeeuwigCartography by Robert Chaney

Geologic mapping and printing was supported by Viceroy GoldCorporation.

Nevada Bureau of Mines and GeologyUniversity of Nevada, Mail Stop 178Reno, Nevada 89557-0088

Regional Lithologic Map

Geologic Map of the Jumbo South–Lesley Ann (JSLA) Pit

GEOLOGIC MAP OF THE CASTLE MOUNTAINS,SAN BERNARDINO COUNTY, CALIFORNIA

AND CLARK COUNTY, NEVADARichard C. Capps

1997

0 0.5 1 kilometer

0 0.5 1 mile

0 4000 5000 feet20001000 3000

Scale 1:24,000

See accompanying text for references and a discussion of the geology and gold mineralization of the Castle Mountains.

CONTOUR INTERVAL 10 METERS

Base map: U.S. Geological Survey 7.5' Quadrangles, Crescent Peak, 1984, Hopps Well, 1984, Castle Peaks, 1984, Hart Peak,1984, Grotto Hills, 1984, and East of Grotto Hills, 1984.

4380

4380

4600

4400

4400

4500

4500

4600

QTs

"JumboDome"

Tpeu

TpllTl

Tl

Tl

Tl

Tl

Tl

TaTlbx

Tlbx

Tlbx

Tpeu

Tpt

Tpt

Tpt

Tpt

Tpt

Tpt

QTs

fractures dip43° to 89°

Tpeu

Tpeu

Ta

Tl

Tl

Tplu

Tplu

Tplu Tpeu

Tplu

Tpll

Tltl

Tib1

Tib1

Tib1

Tlta

Tl

TlTlTl

Tltl

Tib1

Tib1

Tbc

Tbc

TptTib1

Tib2

Tpll

Tib1

Tib2

Tplu

TltlTltl

QTs

fractures dip70° to 89° SE

Tib1

Tl

Tl

Tib1Tib1

Tib1

Tib1

Tib1

Tlbx

Tlbx

Tlbx

Tlta

Tib2

TltaTlbx

Tlp

QTs Tlp

TltaTib1

Tib1

Tltl

Tltl

Tl

TlTl

Tpel

Tpt

Tpt

Tpt

Tpeu Tpel

QTs

Tib1Tib2

Tib1

Tlta

Tib1

Valley View Mine

0 300 feet

0 100 meters30

7085

61

25

65

6070

80

22

7175

74

86

85

58

32

45

24

39

74

20

29

35

58

58

89

10 20

10

4

30

20

65

72

30

43

40

54

68

5667658983

25

88

Tpel

N105000,E101400

N105000,E103600

N103400,E103600

N103400,E101400

164

California

Nevada

Map Area

100

kilometers

Tertiary

Mesozoic

Mesozoic-Paleozoic

Proterozoic

Basaltic andandesitic rocks

Granitoid rocks

Rhyolitic, trachytic,and latitic rocks

Marine sediments andminor volcanic rocks

Metamorphic rocks -gneiss, schist, amphibolite,and pegmatites

Nipton

Woods Mountains

HackberryMtn Homer

Mountain

Lanfair Valley

New

York

Mts

LanfairButtes

Castle MtsMine

PiuteValley

Ivanpah

Valley

Cas

tleM

ts

Searchlight

93

NevadaCalifornia

QTsTca

Thw

Tc

Xg Xgl Xgc Xp Xa

Cl

Xgr

Tjw

Tjt

Tps

Tlt Tltc Tlta Tlbx Tl Tlp

Tjs Tjc Tja Tjat Tjb

Tll

Tha

Tltl

ThbTht

Thv

Thr

Tip

TiprTir

Tqz

Tib2

Tib1

Tpeu Tia

Tia

TidTihaTihr

Tpel

Ta

Tpa Tpag Tpvs TplTpluTpll Tpt Tpd

Tbc

Qs

Qso

Surficial Deposits

Source unknown

Source unknown;possibly locally

associated with Thr

Source unknown; at least3 thin tuffs interbedded within

rocks of Jacks Well

Possible sourcenear Kingman, AZ

Ash-Flow Tuffs andRelated Rocks

Domes, Lavas, andRelated Rocks

Regional Debris Flows and

Related Rocks

Intrusive Rocks

QU

ATE

RN

AR

YT

ER

TIA

RY

PR

OT

ER

OZ

OIC PA

LEO

ZO

IC

Prevolcanic Sedimentary Rocks

Pre-Tertiary Rocks

Rocks Associated withMineralization and

Alteration

Bedded Rocks Dome Lavas

Thb

Xgr

QTsQs

Xg

Thv

Tps TpsTps

TpsTps

Thr

Thr

ThtTht

Tlbx TltTlt Tlt

TjbQs QsQTsTjc

TjcTjc

Tl

Tl

TlTjb

Tjb

TjbTjbTjc TjcTjc

TpsTpsTps

Tl

Xgc

Xgc

TjaQTs QTsQs

QsCl

Xgl

Xgc

TqzTqz

Xgc

Tlp Tia

Tlt

Tlt

Tjb Tjc

Tjw

Tl

Tps

Xg

QTs QTs

ThbTbc

Xg

TjbTjc

TltTlt

Tlt

ThvThb

Tbc

TpaTpd

ThvTjw

Tjw

Tps TpsTjc

Thv

Thb Tbc

QTs

Tpa

Tjw

Tps

Xg

Tpa

Tl

Tps

Tlp

XgXg

Xg

Hart Fault

Tjc

Thb

Xg

Section C - C'

A'meters

1500

1000

500

Ameters

1500

1000

500

California Nevada

California Nevada

TbcThb

TcTps

Xg Xg

QTs QTs QTsQTs QTs

Thv

Tjc Tjc

Tjc

TbcTjt Tjt Tjt

TjcTjcTjcTlt Tlt

Tlt

Tl

TlTl

Jumbo South deposit

Lesley Ann deposit

Section C - C'

Hart FaultTltl

Tltl

Tl

Tl

Tl

TlTl

Tl

QTsQTs QTs

Tc Tc Tc

Tc

Xg

XgXg

Xg

Xg

XgXg

Xg

Tc

Tc TcTcTc

Tja

Tja

Tja Tja

TjaTja

Tjc Tjc

Tja Tja

Tja

Tja

Tjb

TjcTlt

Tlt

Tlt

Tps Tps

Tpl Tib1

Tib2

Tib2

TpsTps

Tiha

Tihr Thr

Thb

TbcTpa

TpsTps

Thv

TpsTps

Tps

Tc

Xg

TjcTps

Tpl Tpe

B' meters

1500

1000

500

Bmeters

1500

1000

500

QTs

TjcTjc

ThrQTs

Tlt

TpsTps

Tja

Tps

Tjc

TlbxQTs

Tl

TjaTja

Tjc

Tps

Tja

TjbTlp

Tl

Tl

Tl

TltaQTs QTsTl

TltTlt

Tl

Tl

Tl TltTjw

QTsTl

Tl

Tlbx

Tc Tps

Tjb TjcTjc

Tlt

QTs

Xg

QTs QTsQTs

Tjc

Tlbx TlbxTht

Tht

Tlt

ThrThb

Section A - A'

Section B - B'Thr

ThbQs Qs Qs

Thb TbcQso Qso QTs

Xgr

Thv Tlt

Thb

Tjb

Tqz

Tlp

TjwTjc

Tc Tc

XgXg Xg

Tlp

Tc Tc

TjaTja

Tjb

Tja

Tjw

TpsTps

Tjc

Xg

Tiha

Xg

Tps

TcTc

TjcTlt

TltTlpTlp QTs

QTs

Tib1

Tc

Tja

XgTc

C'meters

1500

1000

Cmeters

1500

1000

Qs

15

2621

8

5 4

2

310

17

16

6

1

9

31

25

32

24

23

11

22

30

29

33

19

27

28

12

13

34

35

18

7

50

24

75

34

32

45

32

57

40

25

60

2145

20 30

86

25

5

12

10 27

5028

30

20

3040

35

20

35

24 1534

45

9025

1831

43

55

78

48

24

20

30

20

20

20

10

30

25

22

4023

25

64

1618

34

45

55

45

50 3510

65

20

3140

25

65

218019

70

12

4428 24

14

14

80

82

70

54

45

35

60

20

32

16

15 30

25

43

7071

35

60

38

41

62

75

60

60

70

89

25

65

60

40

40

70

45

6089

80

10

75

68

8050

66

77

78

88

62

83

20

20

4050

12

16

15

10105

17

12 10

20

31

25

5

315

655

5

5

25

50

30

22

20

55

50

48

25 40

24 20

15

33

328

39

30

28

25

20

25

1825

22

25

30

78

87

60

20

24

20

34 36

16

19

20

3235

1530 45

25

28

19251525

15

28

20

37 20

30

64

106

41

40

32

34

45

5

31

12

9

25

38

11

30

20

1515

12

79

9

75

78

42

30

35

20

32

48

6

19

2615

7

221

24

2825

4014

4734

30

50

40

50

2950

24

14

44

45

27

5

32

7

15

10

36

16

30

28

32

30

20

5

45

25

12

23

32

10

10

32

35

15

25

20

205

3055

25

28

10

49

45

6456

26

40

4

15

20

24

12

75

2429

89

5888

4034

60

45

35

23

32

1812

29

C'

A

B

B'

A'

C

115°07'30" 115°05'00"

35°20'00"

35°22'30"

115°00'00"115°02'30"115°05'00"115°07'30"

35°22'30"

35°20'00"

35°17'30"

35°15'00"

70

43

20

24

?

Contact Dashed where approximately located.

Normal fault Showing dip and lineations (defined by slickensides); ball on downthrown side; dashed where approximately located, dotted where concealed, queried where uncertain. On cross sections only, arrows show sense of displacement.

Fractures Showing dip; dashed where approximately located. See JSLA pit map.

Strike and dip of beds or compaction foliation in ash-flow tuff

Inclined Vertical Horizontal

Strike and dip of flow foliation in igneous rocks

Inclined Vertical

Strike and dip of foliation in Proterozoic metamorphic rocks

Inclined Vertical

Strike and dip of joint

Inclined

Sample location for age analysis

65

60

40

16

50

34

35

82

65

75

43 7250

40

48

60

58

75

43

75

55

35

19

40

20

45

54

75

85

68

8379

2973

38

54

35

73

2069

60

5

73

QTs

QTs

QTs

Qs

Qs

Qs

Qs

Qs

Qs

Qs

Qs

Tid

Qs

Qs

Qs

Qs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTsQTs

QTs

QTs

QTs

Cl

QTs

QTs

QTs

QTsQTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

Qs

Qs

Qs

Qs

Qs

Qs

Tpa

Tpa

Tpa

Tpa

Tpa

Qs

Qs

Tpt

Tpa

Tpa

Tpag

Tpag

Tpa

Tpa

Tbc

Tbc

Tbc

Tbc

Qs

QsTia

Qs

QTs

Qs

Qs

Qs

Tc

Qs

Qs

Qs

Qs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs

QTs QTs

QTs

QTs

QTs

QTs QTsQs

Qs

QTs

QTs

Qs

Qs

Qs

Qs

Qs

Qs

QsQs

Qs

Tps

TpsTc

Tps

Tps

Tjat

Tps

Qs

Qs

Qs

Qs

QsQs

Qs

QsQs

Qs

Qs

Qs

Qs

QTs

QTsQTs

Qso

QTs

Tpl

Tpl

Tid

Thb

Thb

Thb

Thb

Thb

Tpl

Tja

Tc

Tps

Xgl

Xgl

Xgl

Xgl

Xgl

Xgl

Xgl

Xgl

XglXglXgl

Xgl

XglXgl

Xgl

Xgl

Xgl

Xgl

Xgl

Xgl

Xgl

Xgl

Xgc

Xgc

Xgc

XglXgl

Xgl

Xgl

Xgl

Xgc

Xgc

Xgc

Xgc

Xgc

Xgc

Xgc

Xgc

Xgc

Xgc

Xgc

Xgc

Xgc

Xp

Xp

Xa

Xa

Xa

Xa

Xa

Xa

Xa

Xa

Xa

Xa

Xa

Xa

Xp

TihaTps

Tps

Tps

Tps

Tps

Tps

TpsTps

Tps

TplTpl

Tpa

Tpa

Tpa

Tpa

Tpd

Tbc

Tps

Tps

Xp

Xp

Xp

Xp

Xp

Xp

Xp

Xp

XpXp

Xp

Xp

Xp

Xp

XpXgc

Xa

Xp

Xp

Xp

Xp

Xp

Xp

Xp

Xp

Xp

Xp

Xp

Xp

Xp

Xp

Tjc

Tjc

Tjc

Tjs

Tjw

Thv

Thv

Tht

Tbc

Tlt

Tlt

Thb

Thb

Thv+Tht

Thv+Tht

Thv+Tht

Thb

Thb

Thv

Thv

QTs

QTsQTs

QTs

QTs

QTs

Xg

Xg

Qso

QTs

Xgr

Xgr

Xgr

Xgr

Tps

Tps

TpsTht

Tib1

Thb

Thb

Thb

Thb

Thb

Thb

Thb

Thb

Thb

Thb

Tbc

Thb

Thb

Thb

Thb

Thb

ThbThb

Thb

Thb

Thb

Thb

Thb

Thb

Thb

Tbc

Tbc

Tbc

Tbc

Tbc

Tca

Tca

Tca

Tbc

Tbc

Thv

Thv

Thv

Tht

Tht

Tht

Tht

Thv

Thv

Qs

Thv

Thv

Thv

TplThv

Thv

Thv

Thv

Thv

Thb

Thb

Thb

Thb

Thb

Thb

Thr

Tihr

Tihr

Tihr

Tihr

Thr

Thr

TlTl

Xg

Tl

Tl

Tl

Tl

Tl

Tl

Tl

Tl

Tl

Tl

Tlp

Tlp

Tl

Tl

Tl

TlTl

Tl

Tl

Tl

Tl

Tl

Tll

Tl

Tl

Tl

Tl

Tl

Tl

Tl

Tl

Tl

Tl

Tl

Tl

Tl

Tl

Tl

Tib1

Tib1

Tl

Tl

Tl

Tl

Tl

TlTl

Tl

Tl

Tl

Tl

Tl

Tl

Tia

Tia

Tbc

Tl

Tia

Tia

Tl

TlTlta

Tl

Tl

Tl

TlTl

Tl

Tht

Tht

Tht

Tht

Tht

Tht

Tht

Tht

Tht

Tht

Tht

Tht

Thv

Thv

Thv

Thw

Thw

Tht

Tia

Tia

Tir

Tir

Tir

Tir

Tir

Tir

Tir

Tia

Tia

Tid

Tid

Tia

Tir

Tir

Tip

Tir

Tipr

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

TlbxTlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlbx

Tlt

Tlt

Tlt

Tlt

Tlt

Tlt

Tlt

Tlt

Tlp

Tlp

Tlp

Tlp

Tlp

Tlp

Tlp

Tlp

Tlp

Tlp

Tlp

Tlp

Tlp

Tlp

Tlp

Tip

Tip

Tlp

Tlp

Tlp

Tlp

Tlp

Tlp

Tlp

Tltc

Tlp

Tiha

Tiha

Tiha

Tiha

Tiha

Tiha

Tiha

Tiha

Tihr

Thr

Thr

Thr

Thr

Thr

Thv

Thb

Thb

Tiha

Tib1

Tib1

Tiha

Tiha

Tlp

Tlp

Tlp

Tlp

Tlp

Tlp

Tl

Tlp

Thb

Tid

Tlt

Tpl

Tpl

Tjw Tjw

Tjw

Tjw

Tjw

Tjw

Tjw

Tjs

Tjs

Tja

Tja

Tja

Tja

Tja

Tja

TjsTjs

Tjs

Tjs

Tjs

Tjs

Tjs

Tjs

Tja

Tjt

Tjt

Tjt

Tjt

Tjt

Tjb

Tjb

Tjb

Tjb

Tjb

Tjb

TjbTjb

TjbTlta

Tjb

Tjt

Tjt

Tjt

Tjt

Tjb

Tjc

Tjc

Tjc

Tjc

Tjc

Tjc

Tjc

Tjc

Tjc

TjcTjc

Tjw

Tjc

Tjc

Tjc

TjcTlta

Tlta

Tlta

Tlta

Tlta

Tltl

Tltc

Tltc

Tltc

Tltc

Tltc

Tltc

Tltc

Tltc

TltcTib1

Tlta

Tlta

TihaTpl

Tlta

Tlta

Tlta

Tlta

Tlta

Tlta

Tlta

Tlta

Tlta

Tlta

Tlta

Tlta

QTs

Tha ThaTca

Tlta

Tlta

Tlta

Tlta

TltaTlta

Tlta

Qs

QTs

Qs

QTs

Qs

QTs

Tlta

Tlta

Thb

Thv

ThvThb

Thb

Thv

Tlta

Tlta

Tjc

Tjc

Tjc

Tjc

Tjc

Tjc

Tjw

Tjw

Tjt

Tjs

Tjs

Tjs

Tjs

Tqz

TjaTja

Tjw

TjwTjs

Tia

Tjb

Tjb

Tjb

Tjb

Tjb

Tjc

Tjc

Tjc

Tjc

Tjc Tir

Tir

Tir

Tir

Tir

Tir

Tir

Tir

TirTip

Tir

Tir

Tir

Tir

Tia

Tia

Tia

Tir

Tir

TirTir

Tjc

Tjc

Tjc

Tjc

Tjt

Tjb

Tjb

Tjb

Tjb

Tja

Tjs

Tjw

Tjw

Tjb

Tjb

Tjb

Tjb

Tjb

Tjb

Tjb

Tjc

Tjc

Tjc

Tjb

Tjb

Tjb

Tir

Tjb

Tjb

Tht

ThbTjsTlt

Tlt

Tlt

Tlt

Tlt

Tlt

Tlt

Tlt

Tlt

Tlt

Tlt

Tlt

Tlt

Tlt

Tlt

TltTpt

Tlp

Tlp

TpdTl

Tpl

Tpl

Tpl

Tpl

Tpl

Tpa

Tpl

Tpl

Tpl

Tpl

Tpl

Tpa

Tpa

Tpa

Tpa

Tpa

Tpa

Tpa

Tpa

Tpa

Tpa

Tpa

Tpa

Tpa

TpvsTpa

TpaTpag

Tlt

Tlt

Tlt

Tlt

Tlt

Tlt

Tlt

Tlt

Tlt

Tqz

Tqz

Tqz

Tqz

Tbc

Tqz

Tqz

Tqz

Tqz

Tqz

Tqz

Tqz

Tqz

Tqz

Tqz

Tqz

Tqz

Tqz

Tib1Tlt

Tlt

Tlt

Tlt

Tlt

Tlt

Tlt

Tlt

Tlt

Tlt

Tlt

Tlt

Tlt

Tlt

Tlt

TltTlt

Tlt

Tlt

TltTlt

Tlt

Tlt

Tl

Tl

Tll

Tl

Tl

Tlt

Tlt

Tlt

Tll

Tll

Tll

TllTir

Tlt

Tlbx

TltQs

Qs

Qs

QTs

QTsQTs

QTs

QTs

QTs

Qs

Qs

Qso

Thb Xgr

QTs

QTs

QTs

Xa

Xa

Xa

Xa

Xp

Xgl

Xgl

Xgl

Xgl

Xgl

Xgl

Xgl

Xgl

Xgl

Xgl

Xgl

TpsThb

Thb

Thb

Thb

Xgr

Tht

TbcThb

Thb

Thb

Thb

Thb

Tht

Tht

QTs

QTs

QTs

QTs

QTs

Qs

Qs

Qs

Qs

Qs

QTs

QTs

QTs

Xgl

QTs

Tip

Tia

Xgl

Xgl

Thb

Xgr

Tlt

Tlt

Tlt

Tlt

Tlt

Tlt

Tlt

Tlt

Tl

Tl

TltTlt

TiaTia

Tia

Tia

TiaTia

Tia

Tia

Tia

Tqz

Tqz

Tqz

Tqz

Tqz

Tqz

Tlp

Tl

ThbThb

Thb

Thb

Thv

Thv

Thv

Thv

Thv

Thv

Thb

Thb

Tja

Tja

TjaTht

ThtTid

Tid

TipTlt

Tlp

TlpTid

??

??

??

??

?

?

??

?

?

?

?

?

?

?

Razo

rbac

k

Fault

JSLA PIT

biotite-rich

garnet-bearing

opaline silica andhydrothermal breccia

leucocratic

bakedcontactzone

Xgl (cataclasite)

fault scarp

Tca (colluvium)

Har

tFa

ult

Piu

te

Ran

ge

"RazorbackButte

"

"LinderPeak"

"EggHill"

"Nor

thw

est

Rim

"

N135,000 N135,000

N125,000 N125,000

N115,000

N105,000

N95,000

E100,000 E110,000

E100,000 E110,000 E130,000E120,000