SLATE    DEPOSITS    OE    CALIFORNIA    AND    UTAH. 
421 
located,  having  no  large  dumping  area  available  near  the  quarries. 
Neither  quarry  has  gone  deep  enough  to  get  really  good  slate,  which 
might  have  been  found  at  a  greater  depth. 
San  Francisco  Slate  Company  quarry. — This  quarry  is  located  inT. 
11  N.,  R.  10  E.,  within  a  quarter  mile  of  that  of  the  Chili  Bar  Slate 
Company,  but  on  the  north  side  of  the  river  and  west  of  the  Placer- 
ville-Kelsey  road.  The  principal  opening  was  located  about  600  feet 
north  of  the  river,  at  an  elevation  of  150  feet  above  its  bank.  A 
tramway  led  down  to  the  dressing  yards,  which  were  situated  at  the 
river  bank. 
The  cleavage  of  the  slates  in  the  large  opening  strikes  about  N.  30° 
W.,  and  has  an  almost  vertical  dip.  No  slate  has  been  quarried  here 
since  1897.  A  large  stock  of  trimmed  slates  is  still  piled  in  the  dressing 
yard,  and  many  of  these  have  already  discolored  badly. 
Transportation  and  market. — The  Eldorado  County  slates  have 
practically  no  competition  on  or  near  the  Pacific  coast,  while  the 
Eureka  quarry  has  recently  placed  large  shipments  in  Hawaii  and 
Guam.  Until  recently  the  principal  problem  has  been  the  transpor- 
tation of  the  slates  from  the  quarry  to  the  railroad.  This  was  formerly 
done  by  wagon  hauling  over  a  0-mile  stretch  of  very  hilly  road. 
During  the  last  season,  however,  the  Eureka  Slate  Company  has 
installed  an  aerial  tramway  system  from  its  quarry  to  a  point  near 
Placerville.  This  tramway  is  an  engineering  feat  of  no  mean  order, 
the  crossing  of  the  South  Fork  of  American  River  being  the  principal 
difficulty  encountered. 
Production  of  roofing  slate  i?i  California. — The  following  table, 
compiled  from  figures  given  in  various  volumes  of  Mineral  Resources 
of  the  United  States,  shows  the  amount  and  value  of  California  slate 
production  for  a  number  of  years: 
California  production  of  roofing  shite,  1890-190 1. 
Year. 
Quantity. 
Value. 
Year. 
Quantity. 
Value. 
1890 
1891. 
Squares. 
8, 104 
4,  000 
8,  500 
$18,089 
24, 000 
21,000 
1896 
1897 
Squares. 
4,  597 
1,000 
400 
928 
8,  500 
2,500 
$20, 888 
7,000 
1892 
1898. 
1898 
1899 
1900 
1901 
2,  700 
6,  642 
1894 
900 
1,500 
5,  850 
10,  500 
26, 500 
1895 
18,  608 
UTAH. 
For  some  years  past  a  small  amount  of  slate  has  been  annually 
gotten  out,  chiefly  for  samples  and  trial  shipments,  at  various  points 
in  Utah.     Deposits  of  slate,  believed  to  be  of  workable  extent  and  of 
