318  BIBLIOGRAPHY    OF    NORTH    AMERICAN    GEOLOGY 
Spurr  (Josiah  Edward) — Continued. 
9.  The  ore  deposits  of  Tonopah,  Nevada  (preliminary  report). 
U.  S.  Geol.  Surv.,  Bull.  no.  219,  34  pp.,  1  pi.,  4  figs.,  1903. 
Gives  a  brief  history  of  the  discovery  and  development  of  this  mining  district,  and  describes 
the  geologic  structure  and  history  of  the  region,  the  periods  and  nature  of  mineralization, 
and  the  occurrence  of  the  ores  and  their  relation  to  the  geologic  structure. 
10.  Relation  of  rock  segregation  to  ore  deposition. 
Eng.  &  Mg.  Jour.,  vol.  76,  pp.  54-55,  1903. 
Discusses  the  origin  of  ore  deposits. 
11.  The  ore  deposits  of  Tonopah,  Nevada. 
Eng.  &  Mg.  Jour.,  vol.  76,  pp.  769-770,  illus.,  1903. 
Describes  the  geologic  structure  of  the  region  and  the  occurrence  of  the  ore  deposits  of  precious 
metals. 
12.  A  consideration  of  igneous  rocks  and  their  segregation  or  differentiation  as  related 
to  the  occurrence  of  ores. 
Am.  Inst.  Mg.  Engrs.,  Trans.,  vol.  33,  pp.  288-340,  1903. 
Discusses  the  relations  of  igneous  rocks  and  ore  deposits,  and  the  origin  of  the  latter. 
13.  [In  discussion  of  paper  by  Waldemar  Lindgren,  "The  geological  features  of  the 
gold  production  of  North  America."] 
Am.  Inst.  Mg.  Engrs.,  Trans.,  vol.  33,  pp.  1081-1083,  1903. 
Discusses  the  age  of  certain  gold  deposits  in  Alaska. 
14.  The  application  of  geology  to  mining. 
Intern.  Mg.  Cong.,  Proc.  5th  sess.,  pp.  80-86  [1903]. 
15.  [Genetic  classification  of  ore  deposits.] 
Abstract:  Science,  new  ser.,  vol.  17,  p.  274,  1903. 
16.  The  relation  of  faults  to  topography. 
Abstract:  Science,  new  ser.,  vol.  17,  p.  792,  1903. 
17.  Preliminary  report  on  the  ore  deposits  of  Tonopah,  Nevada. 
U.  S.  Geol.  Surv.,  Bull.  no.  225,  pp.  89-110,  1  pi.  (geol.  map),  4  figs.,  1904. 
See  no.  9  above. 
18.  Ore  deposits  of  Silver  Peak  quadrangle,  Nevada. 
U.  S.  Geol.  Surv.,  Bull.  no.  225,  pp.  111-117,  1904. 
Describes  the  general  geology  and  the  character  and  occurrence  of  the  gold  and  silver  ore 
deposits  and  the  mining  operations. 
19.  Notes  on  the  geology  of  the  Goldfields  district,  Nevada. 
U.  S.  Geol.  Surv.,  Bull.  no.  225,  pp.  118-119,  1904.  ■ 
Describes  the  general  geology  and  the  occurrence  of  gold-bearing  quartz  veins.  * 
20.  Coal  deposits  between  Silver  Peak  and  Candelaria,  Esmeralda  County,  Nev. 
U.  S.  Geol.  Surv.,  Bull.  no.  225,  pp.  289-292,  1904. 
Describes  the  general  geology  of  the  region,  the  character  and  occurrence  of  the  coal,  and 
the  outlook  for  development. 
21.  Alum  deposit  near  Silver  Peak,  Esmeralda  County,  Nev. 
U.  S.  Geol.  Surv.,  Bull.  no.  225,  pp.  501-502,  1904. 
Describes  location,  occurrence,  character,  and  origin  of  this  deposit. 
22.  The  Silver  Peak  region,  Nevada. 
Eng.  &  Mg.  Jour.,  vol.  77,  pp.  759-760,  4  figs.,  1904. 
Describes  the  character,  occurrence,  and  origin  of  the  gold  and  silver  ore  deposits. 
23.  Geology  applied  to  mining.     A  concise  summary  of  the  chief  geological  princi- 
ples, a  knowledge  of  which  is  necessary  to  the  understanding  and  proper  exploi- 
tation of  ore  deposits  for  mining  men  and  students. 
New  York,  The  Engineering  and  Mining  Journal,  326  pp.,  70  figs.,  1904. 
24.  Faulting  at  Tonopah,  Nevada. 
Abstract:  Science,  new  ser.,  vol.  19,  pp.  921-922,  1904. 
25.  The  ores  of  Goldfield,  Nev. 
U.  S.  Geol.  Surv.,  Bull.  no.  260,  pp.  132-139,  2  figs.,  1905. 
Describes  the  general  geology,  and  the  character  and  occurrence  of  the  veins  and  the  origin  of 
the  gold  ores. 
