MINEBK00804

• County: Boulder
• Volume: 12
• Document: Inspectr
• Suffix: A

Big Five - 3.
S
1
G E•0 LOGY .
The geologiosl survey or the diet'1-~ot le inooe~plete.
Tke eharaoter oY the oountr~ rook ie Qranite and porphyry and
the eeole~ioal poriod is Arohean.
ORES & ORE BOD•IE S .
The oharaoter oP ore bodies is Yieanre veins. Thore is
I
i
one vein opened on the Dewdrop Lode and sae on•the Colnabia Lode.
The atrike•ia to the east and west and the dip is to tho north.
The vein varies in width Yroa~l' to 4' with an average width
oY 2'.-The Dewdrop vein has been opened to a height oP'1~200'
and a lepgth•oP 2,600'. The Columbia vein hag been opened to s
height of 1.000' and a length sY 2~UO0*.
The ore ehoote are as follows; 2b0' en east side acid b0'
en west aide oP Columbia oroae-oat; 100' long oa Dewdrop vela
300' west oP npraiee; 60' long west eY lliwet winze; 7b' long
on Dewdrop voin 900' west oY upraleei-the last mentioned oro
eheot worked out tho entire dietanoe.grom the portal eP the tun-
nel~ E~400'~ there ie a Sault in the Dewdrop vein. The rain at '
this point made a movement oY 6' to the southwest. The ranrno
is deooapoeed rranite.and the enolesln~ rooks are granite and
Perlhyry.
The oharaeter•oY vein Pilling is priaoipnlly~iron attlphl-
doe axd quartz bat oontaine a mall peroeatare oP tellnriua.
Tho aotsle are golds silver and ooppor. tls assays or analyses
gluon. One-Fourth eY the vain Pilling ie eaelting ore and the
ether three-Penrths is sr a aonoantratinr nature. The avezare
' value eP tho sill ore !e ~6 par ten. Tho average value eP the
eaeltin$ ere was sot diren. Tho aoaoeatrsting vre in treated
at tho oompany's sill near the mine and all saeltinC ere and
ooaoentratee are shipped to pnblio works Por tnsatsent. Aa nenr-
~ ly ae oenla be learned the vein Silliat ie sP n Pair nverare
~alne.
SURYdCE p1rA~S.
(Continued.)