Mineral Deposits of Eastern California. — Fairbanks. L53 
ties of the sedimentary rocks would seem opposed to the view 
of its primary nature. On the contrary its distribution 
through large areas of massive rocks, as well as the fact that 
in its distribution it generally seems to be independent of 
known ore bodies, is rather difficult of explanation on the view 
of secondary origin. 
Discussion and General Conclusions. 
(a) Gold Ores. A description of the gold quartz veins of 
California has recently been given by Mr. Lingren.* The 
writer agrees with most of the conclusions reached in that 
paper, but in some respects they do not all apply to eastern 
California. For example he statesf that '"the gold quartz 
veins throughout the state of California are closely connected 
in extent with the above described metamorphic series, and that 
the large granite areas are almost void of veins, though fissures 
and fractures are not absent from them." The granite areas of 
the region described contain the greater number of the gold 
bearing quartz veins, and they are by no means insignificant 
in number or value. Lingren £ also says, "'It appears to be a 
fact that veins in grano-diorite contain more sulphurets than 
those in other rocks." This is fully borne out by the writer's 
observations. A statement of general application can be made 
to the effect that the veins in the granite contain but little 
free gold below a certain depth, dependent upon local condi- 
tions, where it is replaced by auriferous iron pyrites. The 
veins in other rocks often contain free gold. This is not- 
ably the fact in the case of the ores at Bodie and in tin- White 
Mountains east of Bishop creek. The gold bearing veins in 
the limestone near Post Office springs contain a large amount 
of sulphurets, thus closely resembling the veins in tin- granite. 
That the veins in all the different formations are of fissure 
origin is unquestionable; they are not segregated, nor in any 
case does the ore seem to have been leached from the walls. 
There can be no question also, at leasl as far a- the gold ores 
an- concerned, that the mineralegical character id' the country 
rock is of no great importance, the influence exerted being 
more often dependent upon physical conditions. The instance 
*Bull. Geol. Soc. Am., vol. vi. pp. 221-240. 
fLoc. cit., p. 239. 
JLoc. cit., p. 231. 
