MINEBK00933

• County: Boulder
• Volume: 6
• Document: Inspectr
• Suffix: A

1"nere is no oeo~ocv.
good geological survey of thedistrict:
pion
~e country rocY, consists of a micacious grsnite cut by a system of fissure
veins having a general north east and south west course.
T}te vein material in
most csses is the altered country rock impregnated
with iron pyrites and carrying free gold and some tellurides,
Frequent assaying has to be resorted to to distinguish what is of value
and what is not.
In some cases the vein can only be distinguished by a line of fracture
there bzing no apparent Qifference betereeh the ore
i
and country rock.
In many places the granite carries a considerable amount of hornblendei
which may throw it into a rock of another class.
1
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