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across 63 feet of this, including 4 feet of quartz carrying about 5 per cent
sulphides, assayed: gold, 0-005 ounce a ton ; Silver, 0-055 ounce a ton; and
copper, 0:03 per cent.

The western part of the broad shear zone that includes ‘vein No. 13’
also contains, at the outcrop on the creek and in the northermost under-
ground working southwest of the creek, a network of quartz lenses and
veins. This network has been called ‘vein No. 12’, and has been explored
for 80 feet. Throughout this length the ‘vein’ is about 10 feet wide,
consisting in most places of a central quartz vein 4 to 5 feet wide flanked
by lenticular subsidiary veins. A sample across 5 feet at the most northerly
face of the underground workings on this ‘vein’ assayed: gold, 0-095 ounce
a ton; silver, 0-28 ounce a ton; and copper, 0°88 per cent. A sample from
the same place, taken by Douglas Lay of the British Columbia Department
of Mines, assayed (Lay, 1940, p. 11): gold, 0-4 ounce a ton; and copper,
0-9 per cent. A sample across 11 feet of the broad shear zone, containing
‘vein No. 12’ and much of the sheared material between ‘vein No. 12°
and ‘vein No. 13’, taken 35 feet south of the above mentioned face,
assayed: gold, 0-02 ounce a ton; silver, 0:10 ounce a ton; and copper,
0-04 per cent. A selected sample from broken rock piled in the drift at
this point, consisting of about equal amounts of milky quartz and sulphides,
assayed: gold, 0-26 ounce a ton; silver, 1-61 ounce a ton; and copper,
5°86 per cent. The aggregate of lens-like quartz bodies with sheared
chloritic partings composing ‘vein No. 12’ pinches abruptly to a width
of about 5 inches, 80 feet south of its outcrop on the creek bank. Under-
ground workings farther south along the western side of the broad shear
zone have penetrated only sheared pyritized hornblende diorite.

The next important shear to the west, called ‘vein No. 14’, is known
at present from underground workings only. It lies about 35 feet west
of the southern part of ‘vein No. 13’, separated from it by two distinct
faults, which have displaced ‘vein No. 14’ upward and northward with
respect to ‘vein No. 13’. ‘Vein No. 14’ is exposed for a total length of
85 feet, and shows a maximum of 8 feet of quartz, though the average
width is probably less than 1 foot. A sample across 3 feet of a typical,
sparsely mineralized part assayed: gold, 0-005 ounce a ton; silver, 0-045
ounce a ton; and copper, nil.

An adit was driven northward on the northeast side of Croydon Creek
approximately on the line of strike of these shear zones in an attempt
to pick up the northward continuation-of the ‘veins’. The adit penetrated
unconsolidated material for 380 feet before reaching smooth, glaciated
bedrock. The edge of the bedrock was followed northwesterly and south-
easterly for a total distance of 300 feet, but no appreciably mineralized
shear zones were encountered.

The mineralized shear zone known as ‘vein No. 10’ outcrops as a
distinct quartz vein 2 feet wide on the southwest bank of Croydon Creek,
250 feet northwest of the outcrops of ‘veins Nos. 12 and 13’. The out-
cropping vein has been followed southerly in underground workings, and
has a maximum width of about 3 feet of heavily mineralized quartz.
About 45 feet south of the portal it pinches to a gouge 2 inches wide. A
crosscut from the south end of the drift that followed the outcropping vein
shows the ground immediately west to be much sheared for a width of 12
feet and to contain many small, mineralized, lens-like quartz veins. A grab

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