QUICKSILVER,  PLATINUM,  TIN,  TUNGSTEN, 
CHROMIUM,  AND  NICKEL. 
Tin  has  been  reported  from  several  localities  in  the  United  States, 
but  has  never  proved  to  be  present  in  commercial  quantities.  A  few 
years  ago,  however,  stream  tin  was  discovered  by  a  Survey  party  in 
Alaska.  This  discovery  attracted  much  attention.  During  the  field 
season  of  1903  a  discovery  of  lode  tin  was  made  in  Alaska.  This  is 
the  subject  of  the  paper  presented  below. 
TIN  DEPOSITS  OF  THE  YORK  REGION,  ALASKA." 
By  Arthur  J.  Collie  p. 
INTRODUCTION. 
The  known  occurrences  of  tin  in  Alaska  are  in  what  is  called  the 
York  region  of  Seward  Peninsula.  This  region  derives  its  name 
from  Cape  York,  an  ill-defined  promontory  on  Bering  Sea  about  90 
miles  northwest  of  Nome.  It  extends  northwestward  from  this  cape 
and  includes  Cape  Prince  of  Wales,  the  most  western  point  of  the  con- 
tinent. The  region  has  the  general  form  of  an  isosceles  triangle,  with 
its  apex  at  Cape  Prince  of  Wales  and  its  two  sides  formed  hy  the 
shore  lines  of  the  Arctic  Ocean  and  Bering  Sea.     (See  map,  fig.  6.) 
The  southern  coast  line  is,  in  the  main,  inhospitable  and  unbroken 
by  inlets  or  harbors.  Back  of  narrow  beaches  the  land  usually  pre- 
sents to  the  sea  an  abrupt  escarpment,  giving  it  a  forbidding  aspect. 
On  the  north  the  land  slopes  more  gently  to  the  Arctic  Ocean  and  the 
coast  is  characterized  by  barrier  beaches  which  cut  off  broad  lagoons 
from  the  open  sea.  Such  a  one  is  Lopp  Lagoon,  a  large  body  of  water, 
but  unfortunately  too  shallow  for  any  but  light-draft  boats.  Port 
Clarence,  20  miles  east  of  Cape  York,  is  the  only  harbor  worth  men- 
tioning in  the  region. 
n  r  a  Abstract  of  a  report  in  preparation. 
