a

-103-

the mountain. Toward the northwest, down the slope, 50 to 500

feet beyond the traced limit of the veins, the dip of the slope
steepens and bedrock is well exposed, but the veins do not appear
to continue. Up the mountain beyond the traced limits of the

veins the slope steepens and the rock is well exposed.

Rio Grande. An old caved-in adit on the Rio Grande property is

probably that noted by Jonesi as showing pyrite and copper stain-
SD eee eee
A.

— Geol. Surv., Canada, Sum. Rept. S25, pe. 142.

I

ing. In 1934 the dump showed argillite cut by stringers of pyrite
and quartz. An open pit above the adit, now largely caved,
discloses some rusty and slightly altered volcanic material, and
in a dump nearby the rock is well mineralized with fine=grained
arsenopyrite, said to assay 1 ounce a ton in gold. No other
workings were noted on the property, but the rock is well exposed
along the hill slope. Diamond drilling had commenced at the time
of visit in September, 1934. The location of these operations is
of interest because of the presence of another type of structural
conditions that might be favourable for ore occurrences. Along
the slope of the mountain to the east below 4,500 feet is the
sedimentary series. The beds strike in the main between 40
degrees and 60 degrees south of east oblique to the hill slope and
dip northeast 15 degrees to 80 degrees, mainly 50 degrees to 50
degrees. Above 4,500 feet are massive green volcanics. The
contact continues along the mountain slope at about the same
elevation, striking slightly north of east and sharply truncating
the sedimentary beds, so that if conditions remain the same
toward the west the sedimentary series would be cut out completely
and the upper volcanics would lie on the lower. The dip of the
base of the volcanics is northward, but its exact angle was not
determined, and is probably irregular. The adit which is only

35 feet below the contact and is 150 feet long was entirely in