96 37 



Minerals Continued Page 



manganese ____ ....... _ ....... /fg 



metacinnabar __________________ 



millerite ...................... 



native mercury. .................. 9S 



87, 134, 142, 145, 146, 166, 171. 177 

 P a ' ................ - ........ ------------ 96, IDt 



re .................................... ... 96 



pilinite .......................... _ ........ 96 



- ............... 95.96,97,98,158 



---------- 27, 61, 95, 96, 99, 101, 104 



serpentine ...... . ....... _ .......... ___ 51,57, 104 



stibnite .................... _____ 9g gg 



sphalerite ....... _ .............. 96 98 



tiemannite ..... _ ...... 9697 



Upper Cretaceous rocks of Santa Clara 



Hills. ......... _ ................ gg 



Miners' Fund ...... __________ ..... 1S , 



Mines outside New Almaden mine... 191 



America.. 



------ .............. - ...... ISO 



Enriquita .......... ..... ............... /M.191 



Providencia ............. _ ..... ____ /5/, 191 



San Antonio ............. _ ......... ltS,l9\ 



San Francisco workings ....... ' 146 



San Mateo mine ....... _ ....... ... jgg t JQJ 



Senator.... ...... ------- .......... ["'_" , sg [ m 



submarginal quicksilver ore. ........ ;7/ 



Monterey formation _______________ jO 



Monterey shale ..... _____ ..... 

 folds ____ 





Moreno area ....... ____ ..... ......... 18 3 



Morgan Hill quadrangle _____ 21 43 



Mount Umunhum.. ......... 13578791 



New Almaden Co., Ltd.. 193 



New Almaden Corp S, 194 195 



New Almaden district, submarginal quick- 



silver ore jfj 



New Almaden mine 7 



9, 17, 33, 34. 46, 58, 62, 82/84, 85, 88^ 

 95, 97, 98, 102, 107, 112, 113, 115, lit, 

 123, 124, 125, 118, 133, 161, let, 173 

 in, 17S, 185, 186, 19b. 



concentration of ore 106 



Day tunnel 00 



98, 110, 126, 136, 1ST, 138, 139, 146, 171, 

 175, 187, 193, 194. 

 deepest quicksilver mine in the world 122 



discovery. __ ng 



Laventura stope m 



production '_'_ ~/r9,"/8/,~183, 188 



yield of quicksilver. _ _ 10 j 



New Almaden mine area, anticline 130 



New Almaden mine property us ISO 



New Almaden mines, history ' 17e 



New Almaden Mining Co., quoted.. m 



New Ouadalupe Mining Co . . . 164 



Newbold's Sons & Co. I9 , 



^R- :::::::~i92,,9s 



North Randol area n2 } y 



Buena Vista shaft ~ 9S, '141,1 86, \go 



Church shaft. M1 



history.. ..... "______ 141 



location and extent of workings m 



North Randol ore body 113, 123, 143, 173, 185 



concentration of ore ' jgg 



North Randol stope jig 



Randol shaft. 139 



HI, Ht, US, 144, 184, 186, 190 



Randol tunnel 171 



Santa Isabel shaft. ... .. 125, 141, 142, 18S 



Old Douglass Ranch quarries. 



Old Hill area 



Ore deposits.. .. 



ite 



163 

 96 



INDEX 



P Page 



Pantin, Jose 1 Henrique, cited ....... 23 24 



Permanente Cement Co ........ 212324 



Placer cinnabar deposit _____ ' \ e9 



yield of quicksilver ____ lm les 



Precipitation ............... 



Present investigation ____ 7 



Pressure, ore deposition. ...... j 23 



Previous work _____ ......... 



Process of serpentinization ....... a j 2 



Production, of quicksilver, future. ... \n 



total, New Almedan mines. us 



Prospect shaft No. 2 ________ 



Providencia mine... ......... 



hlstor y ...... - ....... '---"."";,,. 



location and extent of workings ___________ 151 



Lower Providencia tunnel ____ 151 M 



Pyroclastic rocks _____ ..... ss 



[ 91 



' 



116 

 lie 



',' 



4* 



10,76 







Quarries, limestone 



sandstone 



Santa Teresa Hills .. "$, 



Quartz-actinolitc schist 



Quartz-muscovite schists. .. 

 Quaternary alluvium... 



Quicksilver Mining Co 8, 181, 182, 183 "193 



quoted 



Quicksilver ore bodies 



America mine ,., 



Central stope area 



Cora Blancaarea... lsl 



Enriquita mine. 



loo 



grade , m 



Guadalupe mine 



Harry area 



high-grade ore 



localization 



mode of occurrence.. 



North Randol area 



possibilities for finding new /jj 



production, America mine lso 



Bernalmine -'-'-"'.' 5S, 1S9 



Central stope area lse 



Cora Blanca mine /n 



Enriquita mine lst 



Guadalupe mine } eg ter 



Harry area '.'.'.'.'. 133,134 



North Randol area 



Providencia mine 



San Antonio mine 156 158 



San Francisco area ._ 



San Mateo mine 



San Pedro area 



Santa Mariana area ito 



Santa Teresa mine 58 169 



Senatormine _ ' , fo 



South Randol area. 



Velascoarea 



Victoria area .#o 



Yellow Kid Jr. prospect 



Providencia mine Ift 



relation to intrusi ve rocks 



relation to mineral springs t gg 



relations to structural features no 



San Antonio mine y 



San Francisco area.. t , 7 



San Mateo mine jgo 



San Pedro workings 1S g 



Santa Mariana area /^ 



Senatormine 1S1 



silica-carbonate rock, relation between ore 

 and contact with rocks of Francis- 

 can group m 



South Randol area 546 



Velasco area 



Victoria area.. lss 



- -.- 707 



14I 





H5 

 ' 



205 



Page 

 Quicksilver ore deposits, relation of faults to 



development 90 



Quicksilver ores, age ttl 



depth of deposition 



submarginal m 



Quicksilver production, placer cinnabar de- 169 



P 8it - 169 



R 

 Radiolaria 2g 27 2g 



Randol, J.B vn~iat,m,m 'm 



Randol area, Randol ore bodies i3 9 



Randol stope 



Reduction furnaces 



Rincou fault 



Rotary furnace plant, Mine Hill 



Rotary furnaces.. 



Mine Hill... 



859* 

 '191 



194,195 



San Antonio mine. 



8 



iss 191 



' 



Lower San Antonio tunnel.. 155 



submarginal quicksilver ore /// 



Upper San Antonio tunnel 155 



San Andreasfault 79 



San Francisco area j^g J7 3 I7f 



Arcialore body _ ' 14g 



Curasco ore body 



Garfield shaft. See Washington shaft. 



history t ,g 



location and eitent of workings.. 146 



Manilla ore body _. 140 



New World ore bodies 113,'l'48M7 187 



New World stope _ ' 95 



San Francisco opencut 146, 147, 19^ 195 



San Francisco shaft 14$ 147' 137 



Warren ore body. ' 14 g 



Warren stope ore body 



Washington shaft 146,U9,187 188 



San Juan Bautista quadrangle 



San Mateo mine 104. 108, 115, 168, 172 191 



history.. - tee 



location and eitent of workings lie 



San Pedro-AImaden area ,/g 



San Pedro area, history j ig 



San Pedro tunnel 



San Ramon tunnel. 



San Pedro workings _ 145 //# 



Sandstone, Eocene, Santa Teresa Hills. 69 



Upper Cretaceous rocks in Santa Teresa 



Hills.. _ _ m 



Santa Clara formation 10,75 82 90 122 



faults ' ' jp 



Santa Clara mine 177 



Santa Clara Mining Association 153 



Santa Clara Mission 177 



Santa Cruz quadrangle... 2! 



Santa Lucia granodiorite 45 



Santa Mariana area, history //o 



location and eitent of workings us 



Lower Santa Mariana tunnel ug 



Mariana Road (or Upper Marian No. 2) 



tunnel. 



148 



Upper Santa Mariana (or Carter) tunnel.. 148 



submarginal quicksilver ore 



Santa Teresa block __ .. W,90 93 



Santa Teresa Hills. .3, 6, 10. 13, 33, 39, 40, 42, 47, 48, 58, 



65,Sr,90,91,94,95,/*fi, 169 

 Santa Teresa mine . 95 I6g 



production of quicksilver .. 5g,'^9 



Schenck, H. G., quoted '71 



Schneider, P. S 15g 



Schuette.C.N '-'-'.'-'.'.' 137~m, 194 



quoted _ 124 



Scott, Robert -"-"-.."._.]_ 193 



Scott furnace 159, teg, 164. 169, ISS, 188. 193 



Scope of the report ._ 3 



Sedimentary rocks, chemical gj 



clastic... 



